Light source device, lighting system and projection system

Abstract

The utility model discloses a light source device, an illumination system and a projection system, and belongs to the technical field of illumination and projection. The light source device comprises a light emitting assembly used for emitting exciting light; the light splitting and combining element is used for receiving the exciting light and dividing the exciting light into first light and second light which travel along different directions; the wavelength conversion element is used for receiving the first light and converting at least part of the first light into third light with different wavelength ranges; the scattering and reflecting element is used for receiving the second light, scattering the second light and returning the scattered second light; the angle diffusion element is arranged on the light path of the second light between the light splitting and combining element and the scattering and reflecting element, and is used for expanding the beam angle of the second light before the second light enters the scattering and reflecting element; the light splitting and combining element is further used for receiving the second light from the scattering and reflecting element and the third light from the wavelength conversion element and combining the second light and the third light. The light source device can improve the color uniformity of illumination light.

Description

[0001] The present application is based on the parent application with the application number of 202421569923.4, the application date of July 3, 2024, and the title of "Light source device, lighting system and projection system".

TECHNICAL FIELD

[0002] The present application relates to the field of lighting and projection technology, in particular to a light source device, a lighting system and a projection system.

BACKGROUND

[0003] Laser remote fluorescence technology uses laser to excite remote fluorescent materials to obtain stimulated light, and uses the obtained stimulated light and other light beams with different wavelength ranges to obtain white light or other different color light, which is applied to lighting, projection and other scenes.

[0004] The uniformity of the light beam formed by the light combination has always been a difficulty and pain point restricting the development of laser remote fluorescence technology. Taking the example of blue excitation light exciting fluorescent materials to produce yellow stimulated light, the relative proportion of blue excitation light and yellow stimulated light can make the central region of the combined light show a good white spectrum, but in the peripheral region of the combined light, a yellow light ring is often shown, that is, the entire region of the combined light spot often has color non-uniformity.

SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a light source device for improving the color uniformity of the emitted light.

[0006] To achieve the above-mentioned purpose, in one aspect, the embodiments of the present application provide a light source device, comprising:

[0007] A light emitting component for emitting excitation light;

[0008] A light splitting and combining element for receiving the excitation light and splitting the excitation light into first light and second light traveling in different directions;

[0009] A wavelength conversion element for receiving the first light and converting at least part of the first light into third light with a different wavelength range;

[0010] A scattering and reflecting element for receiving the second light, scattering the second light and returning the scattered second light; and

[0011] An angle diffusion element arranged on the light path of the second light between the light splitting and combining element and the scattering and reflecting element, for expanding the light spot of the second light passing through the angle diffusion element; wherein the light splitting and combining element is further configured to receive the second light from the scattering and reflecting element and the third light from the wavelength conversion element, and the beam angle of the second light and the light spot size of the third light are substantially consistent.

[0012] In some possible implementation manners, the diffusion angle range of the angle diffusion element is 0.4 degrees to 5 degrees.

[0013] In some possible implementation manners, the angle diffusion element is further configured 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 implementation manners, the scattering reflection element comprises a second base body in which first scattering particles are distributed, wherein the first scattering particles scatter the second light in a non-excited manner.

[0015] In some possible implementation manners, the scattering reflection element comprises a second base body in which first scattering particles are distributed, wherein the first scattering particles scatter the second light in a non-excited manner.

[0016] In some possible implementation manners, the scattering reflection element comprises a second base body in which first scattering particles are distributed, wherein the first scattering particles scatter the second light in a reflective or refractive manner.

[0017] In some possible implementation manners, the angle diffusion element comprises a third base body in which second scattering particles are distributed, and the second scattering particles expand the beam angle of the second light in a reflective or refractive manner.

[0018] In some possible implementation manners, the light-in surface and / or the light-out surface of the angle diffusion element is provided with a microstructure, and the microstructure is configured to expand the beam angle of the second light.

[0019] In some possible implementation manners, the projection lens is further configured to project the combined light of the second light and the third light.

[0020] In a second aspect, the embodiments of the present application further provide a lighting system comprising the light source device.

[0021] In a third aspect, the embodiments of the present application further provide a projection system comprising the light source device.

[0022] The present application has the following beneficial effects:

[0023] The light source device provided in this application embodiment adds an angle diffusion element to the optical path of the scattering and reflecting element to expand the beam angle of the second light between the second light incident on the scattering and reflecting element, thereby increasing the size of the light spot formed by the second light incident on the scattering and reflecting element and changing the relative ratio between the light intensity in the central region and the light intensity in the surrounding region of the second light. This compensates for the light 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 combined light of the second light returned by the scattering and reflecting element and the third light emitted by the wavelength conversion element has good uniformity. [Attached Image Description]

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0025] Figure 1 These are schematic illustrations of a light source device according to an embodiment of this application;

[0026] Figure 2 for Figure 1 A schematic illustration of the light spot formed on a distant screen by a beam of light emitted from a light source device.

[0027] Figure 3 for Figure 1 The light distribution curve of the beam emitted from the scattering and reflecting elements and the wavelength conversion element in the light source device;

[0028] Figure 4a for Figure 1 A schematic diagram showing the change of the light spot along the optical path where the mid-scattering and reflecting element is located;

[0029] Figure 4b for Figure 1 A schematic diagram showing the change in the light spot along the optical path where the mid-wavelength conversion element is located;

[0030] Figure 4c for Figure 1 A schematic diagram of the spot of the beam formed by the combination of the beams emitted by the scattering and reflecting element and the wavelength conversion element;

[0031] Figure 5 These are schematic illustrations of a light source device according to an embodiment of this application;

[0032] Figure 6 This is a schematic diagram of the wavelength conversion element in an embodiment of this application;

[0033] Figure 7These are schematic illustrations of a light source device according to an embodiment of this application;

[0034] Figure 8 for Figure 7 A schematic illustration of the light spot formed by the light source device on a distant screen;

[0035] Figure 9a A schematic diagram showing the change in light spot after setting an angle diffusion element in the optical path where the scattering and reflecting element is located;

[0036] Figure 9b A schematic diagram showing the change of the light spot in the optical path where the scattering and reflecting element is located, without an angle diffusion element;

[0037] Figure 10a A schematic diagram showing the change in the light spot after setting an angle diffusion element in the optical path where the scattering and reflecting element is located;

[0038] Figure 10b This is a schematic diagram showing the change in the light spot along the optical path where the wavelength conversion element is located.

Detailed Implementation Methods

[0039] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number or order of the indicated technical features. Thus, technical features defined with "first" and "second" may explicitly or implicitly include one or more of the stated technical features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] The following disclosure provides a number of different embodiments or examples for implementing various aspects of the present application. In order to simplify the present disclosure, only certain specific examples of components and arrangements are described herein. In no way should the present disclosure be limited to the specific examples described herein. Again, such examples are merely for illustrative purposes and are subject to change without missing the scope of the present application. Furthermore, the reference numbers and / or reference letters can be repeated in different examples in the present application, and such repetition is for the purpose of simplifying and clarifying the present application, and does not indicate a specific relationship between the various embodiments and / or arrangements being discussed. In addition, the various specific processes and materials provided in the following description are merely examples for implementing the technical solutions of the present application, but those skilled in the art should realize that the technical solutions of the present application can also be implemented by other processes and / or other materials not described herein.

[0042] Further, the described features, structures can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to fully understand the embodiments of the present application. However, those skilled in the art should realize that the technical solutions of the present application can be practiced even without one or more of the specific details, or by using other structures, components, etc. In other cases, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the present application.

[0043] In previous research progress, the applicant designed a light source device, as shown in Figure 1 The light source device includes a laser light source 100, a wavelength conversion element 200, a scattering reflection element 300 and a light splitting element 500. The laser light source 100 emits laser light, which is incident on the light splitting element 500. The light splitting 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 excited light with different wavelength ranges, and the generated excited light returns to the light splitting element 500 and is reflected by the light splitting element 500. The scattering reflection element 300 scatters the laser light from the light splitting element 500 and reflects the scattered laser light back to the light splitting element 500. The light splitting element 500 at least partially transmits the laser light from the scattering reflection element 300. The excited light reflected by the light splitting element 500 and the laser light transmitted by the light splitting element 3 are spatially combined into a beam of light.

[0044] In previous research, the applicant believes that the excited light generated after the laser excites the wavelength conversion element such as a fluorescent material is basically emitted in the form of a Lambertian light distribution. The scattering reflection element 300 also changes the light distribution of the laser light to be reflected back in the form of a substantially Lambertian light distribution through scattering and reflection of the laser light. Therefore, after the excited light from the wavelength conversion element 200 and the laser light from the scattering reflection element 300 are combined, a uniform light spot can be obtained.

[0045] The applicant's Figure 1 The light source device shown was experimentally verified, such as... Figure 2 As shown, Figure 1 The light source device shown forms a light spot on a distant screen. The laser source 100 emits blue laser light, and the wavelength conversion element 200 includes a yellow fluorescent material, meaning the wavelength conversion element 200 at least partially converts the blue laser light into yellow light. The applicant unexpectedly discovered that while the light spot formed on the distant screen improved the uniformity to some extent, it still exhibited a considerable degree of non-uniformity. Figure 2 In the image, the central area of ​​the light spot appears bluish, while the surrounding area appears yellowish.

[0046] Based on the results of the above experiments, the applicant believes that the reason for the uneven color of the light spot lies in the inconsistency between the light distribution of the received laser emitted from the wavelength conversion element 200 and the laser returned from the scattering and reflecting element 300. In the central region of the combined light spot, the proportion of laser returned from the scattering and reflecting element 300 to the received laser emitted from the wavelength conversion element 200 is too high, while in the surrounding region, the proportion is too low. It is foreseeable that even by adjusting the ratio of laser incident to the wavelength conversion element 200 to the scattering and reflecting element 300, only the uniformity of a localized area of ​​the light spot can be adjusted. For example, the proportion of laser incident to the wavelength conversion element 200 can be increased or decreased, resulting in a white light spot in the central region after light combination, but the yellow light spot in the surrounding area will be more pronounced.

[0047] Accordingly, the applicant studied the beam emitted from the wavelength conversion element 200 and the scattering and reflecting element 300, such as Figure 3 The diagram shows the light distribution curves of the laser emitted from wavelength conversion element 4 and the laser emitted from scattering and reflecting element 2. Figure 3The curve a represents the light distribution curve of the stimulated light emitted by the wavelength conversion element 200, and the curve b represents the light distribution curve of the light emitted by the scattering reflection element 300. The central region of the curve a is obviously lower than the central region of the curve b, so when the light is combined, the color of the central region of the light spot is blue, and in the edge region of the curve a and the curve b, the edge region of the curve a is slightly higher than the edge region of the curve b, and when the stimulated light is combined with the light emitted by the scattering reflection element 300, the proportion of the stimulated light (yellow light) in the edge region of the combined light is higher, so the color of the edge region of the light spot is yellow. Therefore, the applicant believes that the changes of the wavelength conversion element 200 and the scattering reflection element 300 to the light distribution of the laser light are obviously different, and the changes of the wavelength conversion element 200 and the scattering reflection element 300 to the central region and the surrounding region of the laser light are obviously different.

[0048] The applicant believes that the reason for the inconsistency of the changes of the wavelength conversion element 200 and the scattering reflection element 300 to the light distribution of the laser light is multifaceted. One of them is that the conversion efficiency of the wavelength conversion element 200 to the laser light is different at different positions. The conversion efficiency of the wavelength conversion element 200 to the laser light changes with the change of its own temperature, and when the temperature of the wavelength conversion element 200 is too high, the conversion efficiency of the wavelength conversion element 200 to the laser light will decrease significantly. Figure 1 In the light source device shown, the light intensity of the central region of the laser light is high, and the light intensity of the surrounding region is low. After the conversion of the laser light by the wavelength conversion element 200, the heat gradually accumulates in the central region of the laser light, causing the local temperature to rise, thereby causing the conversion efficiency of the wavelength conversion element 200 to the laser light in the central region to decrease. In the surrounding region of the laser light, the heat accumulation and the heat dissipation in the local region are basically balanced due to the relatively low light intensity, and compared with the central region, the conversion efficiency of the wavelength conversion element 200 to the surrounding region of the laser light remains at a relatively high level. Therefore, the stimulated light emitted by the wavelength conversion element 200 presents a relatively reduced light intensity in the central region and a relatively increased light intensity in the surrounding region. In comparison, the scattering reflection element 300 does not convert the wavelength of the laser light, so it will not cause a significant change in the relative proportion of the central region and the surrounding region of the emitted laser light due to heat accumulation.

[0049] The heat accumulation of the wavelength conversion element 200 causes the relative proportion of the central region of the emitted stimulated light to decrease, which to some extent explains the problem of the central region of the combined light of the stimulated light and the laser light being blue, but it is still not enough to explain why the color of the surrounding region of the combined light is yellow. The applicant further studies the light spots of the emitted light of the wavelength conversion element 200 and the scattering reflection element 300, and finds that the size of the light spot of the stimulated light on the emission surface of the wavelength conversion element 200 is significantly larger than the size of the light spot of the laser light on the emission surface of the scattering reflection element 300. Figure 2 The heat accumulation of the wavelength conversion element 200 causes the relative proportion of the central region of the emitted stimulated light to decrease, which to some extent explains the problem of the central region of the combined light of the stimulated light and the laser light being blue, but it is still not enough to explain why the color of the surrounding region of the combined light is yellow. The applicant further studies the light spots of the emitted light of the wavelength conversion element 200 and the scattering reflection element 300, and finds that the size of the light spot of the stimulated light on the emission surface of the wavelength conversion element 200 is significantly larger than the size of the light spot of the laser light on the emission surface of the scattering reflection element 300.

[0050] The applicant believes that the main reason for the difference in spot size of the light exiting 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 light. The wavelength conversion element 200 changes the light distribution of the laser light through the excitation of the wavelength conversion material, such as fluorescent powder, and the excited light generated by the excitation of the wavelength conversion material is randomly emitted in all directions, which results in a significant lateral diffusion phenomenon of the generated excited light compared to the incident laser light, i.e., the generated excited light expands in the lateral direction inside the wavelength conversion element 4, and thus the spot of the excited light exiting the exit surface of the wavelength conversion element 200 is significantly enlarged. While the scattering reflection element 300 also randomly changes the direction of the incident laser light, the scattering reflection element 300 mainly changes the direction of the laser light through reflection, refraction, etc., and thus the diffusion of the laser light in the lateral direction of the scattering reflection element 300 is limited. Therefore, the spot of the excited light exiting the wavelength conversion element 200 is larger than the spot of the laser light exiting the scattering reflection element 300, and the color in the peripheral area of the spot after the combination of the two is obviously yellow.

[0051] Referring to FIG. 4, wherein Figure 4a a schematic diagram of the spot of the laser light on the optical path of the scattering reflection element is shown; Figure 1 a schematic diagram of the spot of the laser light and the excited light on the optical path of the wavelength conversion element is shown; Figure 4b a schematic diagram of the spot of the laser light on the optical path of the scattering reflection element is shown; Figure 1 a schematic diagram of the spot of the laser light and the excited light on the optical path of the wavelength conversion element is shown; Figure 4c a schematic diagram of the spot of the laser light and the excited light on the optical path of the wavelength conversion element is shown; Figure 1 a schematic diagram of the light beam formed by the combination of the excited light exiting the wavelength conversion element and the laser light exiting the scattering reflection element is shown. Figure 4a In the scattering reflection element 300, the spot size of the returned laser light is enlarged to some extent after the scattering of the laser light by the scattering reflection element 300, but the change is relatively small. Figure 4b In the wavelength conversion element 200, the spot size of the laser light formed on the incident surface of the wavelength conversion element 200 is basically the same as the spot size of the laser light formed on the incident surface of the scattering reflection element 300 when the laser light is incident on the wavelength conversion element 200, but the spot size of the excited light formed on the exit surface of the wavelength conversion element 200 has been significantly enlarged when at least part of the laser light is converted into excited light and exits the wavelength conversion element 200, and thus the spot size of the excited light exiting the wavelength conversion element 200 is significantly larger than the spot size of the laser light on the exit surface of the scattering reflection element 300. Figure 4cThe light beam formed by the combination of the stimulated light emitted by the wavelength conversion element 200 and the laser light returned by the scattering reflection element 300 can be found that the spot size and the divergence angle of the stimulated light emitted by the wavelength conversion element 200 and the laser light returned by the scattering reflection element 300 are obviously inconsistent. The spot size of the stimulated light is larger than that of the laser light, and the divergence angle of the stimulated light is smaller than that of the laser light.

[0052] Based on the above research, the applicant designs a light source device, as shown in Figure 5 The light source device includes a light emitting assembly 100, a wavelength conversion element 200, a scattering reflection element 300, an angle diffusion element 400, and a light splitting and combining element 500. The light emitting assembly 100 is used to emit excitation light; the light splitting and combining element 500 is used to receive the excitation light and split the excitation light into first light and second light that travel 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 third light with a different wavelength range; the scattering reflection 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 light path of the second light between the light splitting and combining element 500 and the scattering reflection element 300, and is used to enlarge the beam angle of the second light before the second light is incident on the scattering reflection element 300. The light splitting and combining element 500 is also used to receive the second light returned from the scattering reflection element 300 and the third light from the wavelength conversion element 200, and combine the second light and the third light.

[0053] Before the second light is incident on the scattering reflection element 300, the angle diffusion element 400 changes the angle distribution of the second light, so that the angle distribution of the second light is enlarged towards the direction of overall outward diffusion. After the second light leaves the angle diffusion element 400, the spot of the second light gradually enlarges as it travels in space, until it is incident on the scattering reflection element 300. At this time, the spot size of the second light formed on the scattering reflection element 300 is increased. Since the transverse diffusion of the scattering reflection element 300 is limited, the scattering reflection of the scattering reflection element 300 basically does not further increase the size of the spot. Therefore, the increase in the spot size of the incident second light on the light entrance surface of the scattering reflection element 300 compensates for the difference in spot size between the second light emitted by the scattering reflection element 300 and the third light emitted by the wavelength conversion element 200. In addition, the angle diffusion element 400 enlarges the angle distribution of the second light towards the direction of overall outward diffusion, i.e., both the central region and the surrounding region of the second light are diffused outward in the angle distribution, which reduces the light intensity of the central region of the second light. Therefore, the decrease in light intensity of the central region of the third light caused by the heat accumulation of the wavelength conversion element 200 can be compensated at the same time.

[0054] The first light and the second light can be configured to have a Gaussian distribution, in which the light intensity of the central region is significantly higher than that of the surrounding region. Based on the local heat accumulation, the light intensity of the central region of the emitted stimulated light decreases relatively. After the second light is diffused by the angle diffusion element 400, the central region and the surrounding region are both diffused outward, but the diffused light of the central region compensates for the diffused light of the surrounding region, and the light intensity of the surrounding region is relatively increased, so that the relative proportion of the light intensity distribution of the central region and the surrounding region of the second light is basically consistent with that of the third light emitted by the wavelength conversion element 2.

[0055] The light emitting component 100 can be selected to include a laser diode or a light emitting diode. The excitation light emitted by the light emitting component 100 can contain light components of different polarization states, different wavelength ranges, etc., and the light splitting and combining element 500 splits the excitation light into the first light and the second light based on, for example, different polarization states, different wavelength ranges, etc. of the excitation light. The light splitting and combining element 500 is arranged, for example, to be inclined relative to the incident direction of the excitation light, and guides the first light and the second light obtained by splitting in different directions, for example, transmits the first light obtained by splitting and reflects the second light obtained by splitting. The light splitting and combining element 500 can also split the excitation light into the first light and the second light based on the transmittance and reflectance ratio (the ratio of transmission and reflection) of the excitation light, and can also set different reflection and transmission properties of different regions of the light splitting and combining element 500 to split the excitation light, for example, set a reflective or transmissive structure in the central region of the light splitting and combining element 500, and set a transmissive or reflective structure in the surrounding region of the light splitting and combining element 500 accordingly, so that the central region and the surrounding region of the light splitting and combining element 500 guide the excitation light in different directions to obtain the first light and the second light by splitting. The light splitting and combining element 500 as a whole also exhibits reflectivity to the third light and at least partial transmittance to the second light, so that when receiving the third light from the wavelength conversion element 200 and the second light returned from the scattering reflection element 300, the light splitting and 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 bundle of light on the optical path behind the light splitting and combining element 500.

[0056] Referring to Figure 6 , a structural schematic diagram of the wavelength conversion element is shown. In some embodiments of the present application, the wavelength conversion element 200 includes a wavelength conversion layer 210 for converting at least part of the second light into third light with a different wavelength range. As Figure 5The 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-transmissive medium, i.e., the second light can be incident into the interior of the first substrate, and the wavelength conversion particles can convert the second light incident into the first substrate in wavelength and randomly emit the converted third light toward various directions. The first substrate includes, but is not limited to, ceramic, glass, etc. The wavelength conversion particles include, but are not limited to, (Sr, Ca)AlSiN3:Eu2+, YAG:Ce or LuAG:Ce. The side surface of the first substrate opposite to the incident direction of the second light is further provided with a reflective layer 220 for reflecting the converted third light toward the side from which the second light is incident. In the first substrate, the wavelength conversion particles convert the second light into the third light based on excitation, and the generated third light is randomly emitted toward various directions, which causes the converted third light to have a large lateral diffusion in the first substrate. On the other hand, part of the third light has a relatively large angle relative to the first substrate, and thus is totally reflected when incident onto the incident surface of the first substrate. After one or more reflections through the reflective layer and the incident surface of the first substrate, the third light is further diffused toward the lateral direction, which increases the spot size of the emitted third light.

[0057] In some embodiments of the present application, the side of the reflective layer 220 opposite to the wavelength conversion layer 210 is further provided with a heat-conductive substrate for absorbing heat from the wavelength conversion layer 210 and dissipating the heat.

[0058] In some embodiments of the present application, the scattering reflective element 300, for example, includes a second substrate in which first scattering particles are distributed. The second substrate has a transmittance to the second light, and the transmittance of the second substrate is selected to be smaller than that of the first substrate. That is, the second light can be incident into the second substrate, and the first scattering particles can scatter the second light. The first scattering particles are configured to scatter the second light in a non-excited manner. In some examples, the first scattering particles scatter the second light by reflectivity, e.g., the outer surface of the first scattering particles can reflect the incident second light. The side surface of the second substrate opposite to the incident direction of the second light is provided with a reflective layer for reflecting part of the second light toward the direction from which the second light is incident. The scattering reflective element 300 scatters the second light in a non-excited manner, and the lateral diffusion of the second light in the scattering reflective element 300 is limited in scale, compared with the lateral diffusion of the third light in the wavelength conversion element 200. Therefore, after the angular diffusion element 400 is added, even if the spot size of the received second light is significantly increased, the scattering reflective element 300 does not significantly enlarge the spot size of the second light formed on the light exit surface after scattering, which is beneficial to ensure that the second light and the third light have substantially consistent spot sizes.

[0059] In some embodiments of the present application, the angle diffusion element 400 comprises a third base body, and second scattering particles are distributed in the third base body, and the second scattering particles have the angle diffusion property for the second light. The second scattering particles can be randomly arranged in the third base body, and the second scattering particles have the reflection and / or refraction property for the light. When the second light is incident on the third base body, the second scattering particles distributed in the third base body change the direction of the second light one or more times, so that the angle distribution of the second light is diffused.

[0060] In some embodiments of the present application, the angle diffusion element 400 also receives the second light from the scattering reflection element 300 and again expands the beam angle of the second light. 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 reflection element 300, and again expands the beam angle of the second light after the scattering reflection element 300 returns the scattered second light, so as to compensate for the difference in spot size and angle distribution between the second light and the third light through multiple angle diffusion, and improve the uniformity of the spot formed by the combined light of the second light and the third light.

[0061] In some embodiments of the present application, the diffusion angle range of the angle diffusion element 400 is 0.4 degrees 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, the spot formed by the incident light on the incident surface of the scattering reflection element 300 is smaller than the spot formed by the third light on the light exit surface of the wavelength conversion element 200, and when the diffusion angle range of the angle diffusion element 400 is less than 0.4 degrees, the relative proportion of the light intensity of the central region of the second light is reduced by a limited amount, and the relative proportion of the light intensity of the surrounding region is also increased by a limited amount, so that the light spot region after the combination of the second light and the third light still has 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 expands the beam angle of the second light by a larger amount, resulting in that the spot of the second light on the scattering reflection element 300 is larger than the spot of the third light on the light exit surface of the wavelength conversion element 200, and the light intensity of the central region of the second light is greatly reduced, resulting in that the light spot region after the combination of the second light and the third light also presents obvious color non-uniformity. When the diffusion angle range of the angle diffusion element 400 is in the range of 0.4 degrees to 5 degrees, the second light is increased in beam angle by the angle diffusion element 400, so that the spot size of the second light and the third light is basically the same, and the relative proportion of the light intensity of the central region and the surrounding region of the second light is also basically the same as the relative proportion of the light intensity of the central region and the surrounding region of the third light, so that the entire light spot region after the combination of the second light and the third light has good uniformity.

[0062] In some embodiments of the present application, as shown in FIG. 4, the angle diffusion element 400 comprises a third base body 410, and second scattering particles 420 are distributed in the third base body 410. The second scattering particles 420 have the reflection and / or refraction property for the light, and the second scattering particles 420 are randomly arranged in the third base body 410. Figure 7The light source device further comprises a first collection lens 600, which is arranged between the light splitting and combining element 500 and the wavelength conversion element 200, and 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 collection lens 600 converges the first light to the wavelength conversion element 200, thereby improving the central brightness of the stimulated light emitted by the wavelength conversion element 200. The focal point of the first collection lens 600 can be arranged on the wavelength conversion element 200, or in front of or behind the wavelength conversion element 200. The first collection lens 600 also collects the stimulated light emitted by the wavelength conversion element 200 and reduces the divergence angle of the emitted stimulated light. The arrangement of the first collection lens 600 can improve the utilization efficiency of the stimulated light. The first collection lens 600 can be arranged as one or more lens elements.

[0063] In some embodiments of the present application, the light source device further comprises a second collection lens 700, which is arranged between the light splitting and combining element 500 and the scattering reflection element 300, and is used to converge the second light to the scattering reflection element 300 and collect the second light emitted by the scattering reflection element 300. The second collection lens 700 can also be arranged as one or more lens elements. In some examples, the second collection lens 700 can be arranged to have the same or similar parameters as the first collection lens 600, so that the first collection lens 600 and the second collection lens 700 are consistent, and the difference between the first collection lens 600 and the second collection lens 700 does not cause the difference in the light distribution of the third light and the second light.

[0064] The angle diffusion element 400 can be arranged between the second collection lens 700 and the light splitting and combining element 500, or between the second collection lens 700 and the scattering reflection element 300.

[0065] In some embodiments of the present application, the light source device further comprises a projection lens arranged on the light path of the combined light of the second light and the third light emitted by the light splitting and combining element 500, to project the combined light of the second light and the third light out of the light source device to form the emitted light. The projection lens comprises a focusing lens 800 used to focus the combined light of the second light and the third light. The projection lens further comprises a collimating lens 900 arranged behind the focal point of the focusing lens 800, used to collimate the combined light of the second light and the third light out of the light source device. The combined light of the second light and the third light is focused at a focal point by the focusing lens 800, and after passing through the focal point, the combined light continues to travel at a certain divergence angle. By changing the relative position of the collimating lens 900 relative to the focal point of the focusing lens 800, 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 by the collimating lens 900.

[0066] The applicant has conducted experiments on the light spot formed by the light emitted by the light source device of the embodiment of the application on a far screen, as shown in Figure 8 The color of the central region and the surrounding region of the light spot formed in the embodiment of the application is very uniform.

[0067] Table 1 is Figure 1 The experimental data of the illuminating light spot emitted by the light source device and Figure 5 The experimental data of the illuminating light spot emitted by the light source device and Table 1

[0068]

[0069]

[0070] The color of the central region and the surrounding region of the light spot formed in the embodiment of the application is very uniform. Figure 2 The color of the central region and the surrounding region of the light spot formed in the embodiment of the application is very uniform.

[0071] Referring to FIG. 9, wherein Figure 9a is a schematic diagram of the light spot variation of the light source device with the angle diffusion element 400, Figure 9b is a schematic diagram of the light spot variation of the light source device without the angle diffusion element 400. First, referring to Figure 9b When the angle diffusion element 400 is not added, the excitation light emitted by the light emitting assembly 100 is split by the light splitting and combining element 500, and the second light is reflected to the scattering reflection element 300. The second light is incident on the scattering reflection element 300, and a small light spot is formed on the scattering reflection element 300. Even if the scattering reflection element 300 scatters the second light to have a certain lateral diffusion, the light spot of the second light emitted on the light emitting surface of the scattering reflection element 300 is still small, and the light spot formed by the second light after the light splitting and combining element 500 combines the light is also small. Figure 9bAfter the angle diffusion element 400 is added, the angle diffusion element 400 enlarges the divergence angle of the second light, but does not change the surface distribution of the second light basically. When the second light travels a distance to reach the scattering reflection element 300, the light spot formed on the incident surface of the scattering reflection element 300 is obviously enlarged. The second light emitted after scattering by the scattering reflection element 300 also has a relatively large light spot. Therefore, the light spot formed after the light is combined by the light combining element 500 has a relatively large light spot.

[0072] Referring to FIG. 10, wherein Figure 10a a light spot change schematic diagram of adding the angle diffusion element 400 is shown, Figure 10b a light spot change schematic diagram of the wavelength conversion element 200 is shown. As Figure 10a After the angle diffusion element 400 is added, the second light first passes through the angle diffusion element 400 to be angle-diffused before being incident on the scattering reflection element 300. Therefore, the size of the light spot formed on the incident surface of the scattering reflection element 300 is increased. Due to the effect of the angle diffusion of the angle diffusion element 400, the divergence angle of the second light emitted by the scattering reflection element 300 is also increased. By comparing Figure 10b the light spot change of the wavelength conversion element 300, it can be seen that the size of the light spot of the second light incident on the scattering reflection element 300 is larger than the size of the light spot of the first light incident on the wavelength conversion element 200. However, the lateral diffusion of the first light by the wavelength conversion element 200 is obviously larger than the lateral diffusion of the second light by the scattering reflection element 300. Finally, the size of the light spot of the second light formed on the exit surface of the scattering reflection element 300 is basically consistent with the size of the light spot of the third light formed on the exit surface of the wavelength conversion element 200. The divergence angle of the second light emitted by the exit surface of the scattering reflection element 300 is basically consistent with the divergence angle of the third light emitted by the exit surface of the wavelength conversion element 200. Therefore, the light combining of the second light emitted by the scattering reflection element 300 and the third light emitted by the wavelength conversion element 300 can have good consistency of surface distribution and angle distribution in any cross section. Therefore, the color consistency is good in the whole light spot.

[0073] The light source device of the embodiment of the present application can be applied in a lighting or projection system such as a stage lamp, a searchlight, a projector, etc.

[0074] The embodiment of the present application also provides a lighting device comprising the light source device as described above.

[0075] The embodiment of the present application also provides a projection device comprising the light source device as described above.

[0076] In the description of the application, reference is made to the terms "one embodiment", "some embodiments", "certain embodiments", "an example", "a specific example", or "some examples" etc. which are meant to include a particular feature, structure, material, or characteristic in at least one embodiment or example of the application. The appearances of such terms in various places in the specification are not necessarily referring to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0077] The above description is merely illustrative of the application and is not intended to limit the application. Any modification, equivalent replacements, and improvements made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A light source device, characterized in that, include: Light-emitting components, used to emit excitation light; A beam splitter and beam combiner receives the excitation light and splits it into a first beam and a second beam that travel in different directions. A wavelength conversion element is used to receive the first light and convert at least a portion of the first light into a third light with a different wavelength range; A scattering and reflecting element is used to receive the second light, scatter the second light, and return the scattered second light; as well as An angle diffusion element is disposed in the optical path of the second light between the beam splitting and combining element and the scattering and reflecting element, for expanding the light spot of the second light passing through the angle diffusion element; The light splitter and combiner is also used to receive a second light from the scattering and reflecting element and a third light from the wavelength conversion element, wherein the spot size of the second light and the spot size of the third light are substantially the same.

2. The light source device according to claim 1, characterized in that, The diffusion angle range of the angular diffusion element is 0.4 degrees to 5 degrees.

3. The light source device according to claim 1, characterized in that, The angle diffusion element is also used to receive the second light returned by the scattering and reflecting element, and to further expand the beam angle of the second light.

4. The light source device according to claim 1, characterized in that, The scattering and reflecting element includes a second substrate in which first scattering particles are distributed, wherein the first scattering particles scatter the second light in a non-excited manner.

5. The light source device according to claim 1, characterized in that, The scattering and reflecting element includes a second substrate, in which first scattering particles are distributed, wherein the first scattering particles scatter the second light by reflection or refraction.

6. The light source device according to claim 1, characterized in that, The angle diffusion element includes a third substrate in which second scattering particles are distributed, the second scattering particles expanding the beam angle of the second light by means of reflection or refraction.

7. The light source device according to claim 1, characterized in that, The incident and / or exit surfaces of the angle diffusion element are provided with microstructures, which are used to expand the beam angle of the second light.

8. The light source device according to claim 1, characterized in that, It also includes a projection lens, which is disposed in the optical path of the combined light of the second light and the third light emitted from the beam splitter and combiner. The projection lens includes a focusing lens and a collimating lens. The focusing lens is used to focus the combined light of the second light and the third light, and the collimating lens is used to collimate the combined light of the second light and the third light for direct emission.

9. A lighting system, characterized in that, Includes the light source device as described in any one of claims 1 to 8.

10. A projection system, characterized in that, Includes the light source device as described in any one of claims 1 to 8.

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