A projection system
Patent Information
- Application Number
- CN202521723211.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-13
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-08-13
AI Technical Summary
[0003]有鉴于此，本实用新型的目的在于提供一种投影系统，以解决投影仪的多个激光光源合光后光斑较大，影响成像效果的技术问题
[0018]本实用新型的一种投影系统采用偏振合光元件合光，可以将多个光源的光斑合为一个光斑，减小光源模组出射的光斑大小，提高光能利用率，减少了对成像效果的影响；
Smart Images
Figure CN224789065U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of projection equipment technology, and specifically relates to a projection system. Background Technology
[0002] Currently, most home projectors on the market use lasers as their light source. Laser light sources offer advantages such as high brightness, excellent color reproduction, high image detail, and long lifespan. However, due to the small divergence angle of laser light sources, their arrangement significantly affects the uniformity of the light field, leading to suboptimal projected image quality. High-brightness projectors often contain multiple laser light sources. However, due to limitations in heat dissipation, power supply, and the size of the laser itself, the combined light from these multiple sources results in a larger light spot, negatively impacting image quality. Utility Model Content
[0003] In view of this, the purpose of this utility model is to provide a projection system to solve the technical problem that the combined light spot of multiple laser light sources in a projector is too large, which affects the imaging effect.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A projection system includes a first light source, a second light source, a third light source, and a light combining component. The first light source emits a first color light, the second light source emits a second color light, and the third light source emits a third color light. The light combining component includes a polarization conversion element, a polarization combining element, and a wavelength combining element. The first light source is disposed on a first side of a first direction, the second light source is disposed on a second side of the first direction, and the third light source includes a third light source unit one and a third light source unit two. The third light source unit one is disposed on the second side of the first direction, and the third light source unit two is disposed on the second side of the first direction or at the end of the first direction. At least one of the first, second, and third light sources includes two paths of emitted light of the same color. One of the emitted light of the same color has the polarization conversion element disposed in its optical path to switch the polarization state and then combine it with the other emitted light of the same color through the polarization combining element. The wavelength combining element transmits at least one of the first, second, and third color light and reflects at least one other color light, resulting in the combined emission of different colors of light directed towards the wavelength combining element.
[0006] In a possible implementation, the first light source includes a first light source unit one and a first light source unit two. A first polarization conversion element is provided in the optical path of the light emitted from the first light source unit one and the first light source unit two. The first polarization conversion element converts the light emitted from the first light source unit one and the first light source unit two into different polarization states, and combines the light into a single output through a first polarization combining element. A second polarization conversion element is provided in the optical path of the light emitted from the third light source unit one and the third light source unit two. The second polarization conversion element converts the light emitted from the third light source unit one and the third light source unit two into different polarization states, and combines the light into a single output through a second polarization combining element before output to the wavelength combining element. The first color light, the second color light, and the third color light emitted to the wavelength combining element are combined into a single output through the wavelength combining element.
[0007] In a possible implementation, at least one of the first light source, the second light source, and the third light source includes two parallel sub-beams, which are spaced apart in a first direction and guided to the first direction by different or the same element; or, the two sub-beams are spaced apart perpendicular to the first direction and guided to the first direction by the same element.
[0008] In a possible implementation, the two sub-beams of each of the first, second, and third light sources are spaced apart in a first direction; or, the two sub-beams of each of the first, second, and third light sources are spaced apart perpendicular to the first direction.
[0009] In a possible implementation, the first light source is guided by the polarization combining element to emit two paths of first-color light; the second light source is guided by the wavelength combining element to emit two paths of first-color light; the third light source is guided by the polarization combining element to emit two paths of third-color light; the two paths of first-color light, the two paths of first-color light, and the two paths of third-color light are respectively guided by the wavelength combining element to overlap.
[0010] In a possible implementation, at least one of the first light source, the second light source, and the third light source is provided. Two sub-beams are distributed at intervals in a first direction. The two sub-beams are guided to the first direction by different elements. The element in the optical path of one sub-beam is a polarizing beam combiner to combine with another outgoing beam to form a single outgoing beam. The element in the optical path of the other sub-beam is a reflecting element.
[0011] In one possible implementation, two sub-beams guided to a first direction by different elements are guided to a wavelength combining element by a reflective element.
[0012] In a possible implementation, the first light source unit 1 and the first light source unit 2 are guided to the first direction by different elements. The element in the optical path of one of the light source units is a wavelength combining element, which combines with another color of light to emit light in one path. The element in the optical path of the other light source unit is a polarization combining element.
[0013] In a possible implementation, the second light source and the third light source unit are arranged in a staggered manner from the first light source unit and the first light source unit 2 in a first direction.
[0014] In possible implementations, temperature control component one and temperature control component two are also included. Temperature control component one is disposed next to the first light source to control the temperature of the first light source, and temperature control component two is disposed next to the second light source and / or the third light source to control the temperature of the second light source and the third light source.
[0015] In one possible implementation, a dissipation element is provided on the light-emitting path of the light-combining component.
[0016] In possible implementations, at least one of the first light source, the second light source, and the third light source has a diffusion element disposed in its outgoing light path, and / or, the wavelength combining element has a diffusion element disposed in its outgoing light path.
[0017] Compared with the prior art, the present invention has the following beneficial effects:
[0018] The projection system of this utility model uses a polarizing light combining element to combine the light spots of multiple light sources into one light spot, thereby reducing the size of the light spot emitted by the light source module, improving the light energy utilization rate, and reducing the impact on the imaging effect.
[0019] Meanwhile, a polarization combining element is used to combine the light spots of multiple light sources into one light spot, reducing the spacing between light sources and the size of the light source module;
[0020] In addition, the first light source is set on the first side of the first direction, the second light source and the third light source unit one on the second side of the first direction are set on the second side of the first direction, and the third light source unit two is set at the tail end of the first direction, so that the first light source with high heat dissipation requirements can be cooled separately, and the second light source and the third light source with lower heat dissipation requirements can be cooled together, thereby reducing the number of heat dissipation devices and reducing the size of the light source module. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of a projection system provided in Embodiment 1 of this utility model;
[0022] Figure 2This is a schematic diagram of the structure of a projection system provided in Embodiment 2 of this utility model;
[0023] Figure 3 This is a light spot diagram of red, green, and blue light in Embodiment 1 of this utility model;
[0024] Figure 4 This is a light spot diagram of red, green, and blue light in Embodiment 2 of this utility model.
[0025] In the diagram: 1-First light source, 101-First light source unit one, 102-First light source unit two, 2-Second light source, 3-Third light source, 301-Third light source unit one, 302-Third light source unit two, 4-First polarization combining element, 5-Second polarization combining element, 6-Third polarization combining element, 7-Fourth polarization combining element, 8-First wavelength combining element, 9-Second wavelength combining element, 10-Third wavelength combining element, 11-Fourth wavelength combining element, 12-First reflecting element, 13-Second reflecting element, 14-Third reflecting element, 15-Diffusing element, 16-First diffuser element, 17-Second diffuser element, 18-Dissipation element, 19-First polarization conversion element, 20-Second polarization conversion element. Detailed Implementation
[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to specific embodiments.
[0027] Please refer to Figure 1-2 As shown, embodiments of this application provide a projection system to solve the technical problem that the combined light spot of multiple laser light sources in a projector is too large, affecting the imaging effect.
[0028] A projection system includes a first light source, a second light source, and a third light source, wherein the first light source emits a first color light, the second light source emits a second color light, and the third light source emits a third color light. The first color light, the second color light, and the third color light are respectively one of red light, green light, and blue light, and the first color light, the second color light, and the third color light are light of different colors. The first light source, the second light source, and the third light source are all laser light sources. The light combining component includes a polarization conversion element, a polarization light combining element, and a wavelength light combining element.
[0029] The first light source is positioned on the first side in the first direction, such as... Figure 1-2As shown, the first direction is the direction parallel to the x-axis in the figure. The second light source is located on the second side of the first direction. The first side and the second side are circumferential directions of the first direction. The first side and the second side can be any position in the circumferential direction of the first direction. The first side and the second side are different positions in the circumferential direction of the first direction, that is, the first light source and the second light source are not in the same position. The third light source includes a third light source unit one and a third light source unit two. The third light source unit one is located on the second side of the first direction, and the third light source unit two is located on the second side of the first direction or at the end of the first direction. That is, the third light source includes the third light source unit one located on the second side of the first direction and the third light source unit two located at the end of the first direction, or the third light source includes the third light source unit one located on the second side of the first direction and the third light source unit two located at the end of the first direction. The positions of the third light source unit one and the third light source unit two can be interchanged.
[0030] At least one of the first, second, and third light sources includes two beams of the same color. One of the beams of the same color is provided with a polarization conversion element in its beam path, so that the two beams of the same color emitted from the same light source have different polarization states. After the polarization conversion element switches the polarization state of the emitted light in the beam path, it is combined with the other beam of the same color into one beam through a polarization combining element. By using a polarization combining element to combine the light spots of multiple laser light sources into one light spot, the size of the light spot emitted by the laser module is reduced, which is beneficial to improving the subsequent light energy. At the same time, it can also reduce the spacing between lasers and reduce the size of the laser module.
[0031] A wavelength combining element transmits at least one of a first color light, a second color light, and a third color light while reflecting at least another color light. That is, among the different colors of light emitted to the wavelength combining element, the wavelength combining element reflects one color light and transmits another color light or two other colors of light, or the wavelength combining element reflects two colors of light and transmits another color light. Specifically, when there are two colors of light emitted to the wavelength combining element, the wavelength combining element reflects one color light and transmits another color light; when there are three colors of light emitted to the wavelength combining element, the wavelength combining element reflects one color light and transmits the other two colors of light, or the wavelength combining element reflects two colors of light and transmits another color light, thereby combining and emitting different colors of light emitted to the wavelength combining element. The wavelength combining element can be a filter or a dichroic mirror, etc.
[0032] The first light source includes a first light source unit 1 and a first light source unit 2. A first polarization conversion element is provided in the optical path of the light emitted from the first light source unit 1 and the first light source unit 2. The first polarization conversion element converts the light emitted from the first light source unit 1 and the first light source unit 2 into different polarization states, and combines the light into a single output through a first polarization combining element. The first polarization combining element combines the light emitted from the first light source unit 1 and the first light source unit 2 into a single output, so that the light spots formed by the light emitted from the first light source unit 1 and the first light source unit 2 overlap, thereby reducing the size of the light spot.
[0033] A second polarization conversion element is provided in the optical path of the light emitted from the third light source unit 1 and the third light source unit 2. The second polarization conversion element converts the light emitted from the third light source unit 1 and the third light source unit 2 into different polarization states, and combines the light into a single wavelength combining element through the second polarization combining element. Similarly, the second polarization combining element combines the light emitted from the third light source unit 1 and the third light source unit 2 into light of different polarization states, so that the light spots formed by the light emitted from the third light source unit 1 and the third light source unit 2 overlap, thereby reducing the size of the light spot.
[0034] The first, second, and third colored lights emitted to the wavelength combining element are combined into a single output. The wavelength combining element combines the light emitted from the first, second, and third light sources into a single output, thereby reducing the size of the light spot.
[0035] At least one of the first, second, and third light sources includes two parallel sub-beams. The two sub-beams are spaced apart in a first direction, and each sub-beam is guided to the first direction by a different element. Different elements are used to guide the two sub-beams to the first direction. The specific elements used can be flexibly selected to guide different beams according to requirements, thereby achieving the purpose of saving costs and obtaining better light spots. The elements can be reflective elements, wavelength combining elements, polarization combining elements, partially transmissive and partially reflective elements, etc., depending on the specific application scenario. Alternatively, the two sub-beams are spaced apart perpendicular to the first direction, and the two sub-beams are guided to the first direction by the same element. Using the same element to guide the two sub-beams to the first direction can reduce the arrangement of elements, thereby reducing the use of elements and saving space. Similarly, the elements can also be reflective elements, wavelength combining elements, polarization combining elements, partially transmissive and partially reflective elements, etc., depending on the specific application scenario.
[0036] It also includes temperature control component one and temperature control component two. Temperature control component one is located next to the first light source to control the temperature of the first light source, so as to cool the first light source through temperature control component one. The first light source is a light source that requires better heat dissipation, so it is convenient to set temperature control component one alone on one side of the first light source to better dissipate heat from the first light source. Temperature control component two is located next to the second light source and / or the third light source to control the temperature of the second light source and the third light source. The second light source and the third light source have lower heat dissipation requirements than the first light source, so temperature control component two can be used to cool the second light source and the third light source. Temperature control component one is located next to the first light source, and temperature control component two is located next to the second light source. That is, temperature control component one is located at any position around the first light source, and temperature control component two is located at any position around the second light source, but the positions of temperature control component one and temperature control component two shall not affect the emitted light of the first light source, the second light source, and the third light source.
[0037] The light-combining component has a light-dissipating element in the output light path. The light-dissipating element is used to reduce speckle. The light source after the first light source, the second light source and the third light source are combined is homogenized and then passed through a microlens array to achieve light spot shaping, converting the light spot into a square or rectangle.
[0038] A diffusion element is provided in the output light path of at least one of the first light source, the second light source, and the third light source, and / or a diffusion element is provided in the output light path of the wavelength combining element. The diffusion element is used to increase the divergence angle of the corresponding color light, so that the difference in the divergence angles of the first color light, the second color light, and the third color light is small, which makes it easier to make the light spot size formed by the combination of the first color light, the second color light, and the third color light more consistent.
[0039] Example 1
[0040] like Figure 1 As shown, in a projection system provided in this embodiment, a first light source 1 is disposed on a first side in a first direction, a second light source 2 is disposed on a second side in the first direction, and a third light source 3 includes a third light source unit 301 on the second side in the first direction and a third light source unit 302 at the tail end in the first direction. In this embodiment, the second side is located in the direction away from the first side in the first direction, that is, the second side is disposed opposite to the first side. In this embodiment, the first side is... Figure 1 Above the middle, the second side is located Figure 1 Below the middle, the tail end in the first direction is located Figure 1The light source unit 302 is positioned to the left of the first light source 1, the second light source 2, and the third light source 3, respectively, on the first and second sides. Optionally, the third light source unit 302 can also be positioned on the second side of the first direction, i.e., the third light source unit 301 is located between the second light source 2 and the third light source unit 302. In this case, a reflective element is needed to guide the light emitted from the third light source unit 302 to the first direction, which is... Figure 1 In the direction parallel to the x-axis, the first, second, and third colors of light are all monochromatic lasers. For example, the first color of light is a red laser with a wavelength of 642nm-654nm, the second color of light is a green laser with a wavelength of 521nm-533nm, and the third color of light is a blue laser with a wavelength of 450nm-468nm.
[0041] In this embodiment, the first light source 1 is red light, the second light source 2 is green light, and the third light source 3 is blue light. Since the temperature characteristics of the laser diode emitting red light are worse than those of the laser diode emitting green or blue light, the laser diode emitting red light needs a lower temperature to maintain the reliability of the light source output. The laser diode emitting red light needs to keep its casing temperature at 40-50°C, while the laser diodes emitting green and blue light need to keep their casing temperature at 45-70°C. Therefore, the first light source 1 is set separately on the first side to facilitate better heat dissipation of the first light source 1.
[0042] In this embodiment, both the first light source 1 and the third light source 3 contain two paths of emitted light of the same color. The two emitted lights in the first light source 1 are the first light source unit 101 and the first light source unit 2 102, respectively. A first polarization conversion element 19 is provided on the optical path of the emitted light from the first light source unit 101 and the first light source unit 2 102. The first polarization conversion element 19 is used to convert the emitted light from the first light source unit 101 and the first light source unit 2 102 into P-state and S-state light. The polarization states of the first light source unit 101 and the second light source unit 2 102 are different. The light emitted from the first light source unit 101 can be either P-state or S-state. The light emitted from the first light source unit 101 and the first light source unit 2 102 is combined into one path by the first polarization combining element 4. The two emitted lights in the third light source 3 are the third light source unit 101 and the third light source unit 2 302, respectively. The third light source unit 101 is located on the opposite side of the first light source unit 2 102. The optical paths of the emitted light from the third light source unit 101 and the third light source unit 2 302 are... A second polarization conversion element 20 is provided, which is used to convert the light emitted from the third light source unit 101 and the third light source unit 202 into P-state and S-state light. The polarization states of the third light source unit 101 and the third light source unit 202 are different. The light emitted from the third light source unit 101 can be either P-state or S-state. The light emitted from the third light source unit 101 and the third light source unit 202 is combined into one by the second polarization combining element 5. As a more preferred option, the P-state light is transmitted through the first polarization combining element 4 or the second polarization combining element 5 and combined with the S-state light. The S-state light is reflected through the first polarization combining element 4 or the second polarization combining element 5 and combined with the P-state light. That is, in this embodiment, the light emitted from the first light source unit 101 and the third light source unit 101 becomes S-state after passing through the polarization conversion element 19 or the second polarization conversion element 20, and the light emitted from the first light source unit 202 and the third light source unit 202 becomes P-state after passing through the polarization conversion element 19 or the second polarization conversion element 20.
[0043] In this embodiment, there are two wavelength combining elements: a first wavelength combining element 8 and a second wavelength combining element 9. The first wavelength combining element 8 reflects the second color light and transmits the third color light. The second wavelength combining element 9 reflects the second color light and the third color light and transmits the first color light. The third color light emitted by the third light source unit 1 301 and the third light source unit 2 302 is combined by the second polarization combining element 5 and then emitted towards the first wavelength combining element 8. After being transmitted through the first wavelength combining element 8, the second color light emitted by the second light source 2 is reflected by the first wavelength combining element 8 and combined with the third color light transmitted by the first wavelength combining element 8 before being emitted towards the second wavelength combining element 9. The first color light emitted by the first light source 1 is combined by the first polarization combining element 4 and then emitted towards the second wavelength combining element 9. After being transmitted through the second wavelength combining element 9, it is combined with the second color light and the third color light before being emitted.
[0044] In this embodiment, the first light source unit 101, the second light source unit 102, the second light source 2, and the third light source unit 301 each contain two parallel sub-beams, which are spaced apart in a first direction. The two sub-beams of the first light source unit 101 are guided to the first direction by reflection from two first polarization combining elements 4, with each sub-beam passing through one first polarization combining element 4. The two sub-beams of the first light source unit 102 are guided to the first direction by two first reflection elements 12 and emitted towards the first polarization combining element 4, with each sub-beam passing through one first reflection element 12. One of the two first polarization combining elements 4 combines one sub-beam from the first light source unit 101 and one sub-beam from the first light source unit 102 into a single emitted beam, while the other first polarization combining element 4 combines another sub-beam from the first light source unit 101 and one sub-beam from the first light source unit 102 into a single emitted beam. The light beams are combined into a single output; the two sub-beams in the second light source 2 are reflected by two first wavelength combining elements 8, with each sub-beam corresponding to one first wavelength combining element 8; the two sub-beams in the third light source unit 1 301 are reflected and guided to the two first wavelength combining elements 8 by the second polarization combining element 5 and the second reflection element 13, respectively; the third light source unit 2 302 contains one sub-beam; the light emitted from the third light source unit 2 302 is combined with the light emitted from the third light source unit 1 301 by the second polarization combining element 5 and then emitted to the first wavelength combining element 8, and is further combined with the light emitted from the second light source 2 by the first wavelength combining element 8 and then emitted; the setting of two first polarization combining elements 4, two first reflection elements 12, two first wavelength combining elements 8, and the setting of second polarization combining elements 5 and second reflection elements 13 corresponding to the two sub-beams can adapt to the corresponding light beams, reduce the size of the corresponding elements, better adapt to the corresponding light beams, and reduce the space occupied by the corresponding elements.
[0045] like Figure 1 and Figure 3As shown, the first light source 1 emits two paths of first-color light guided by the first polarizing light combining element 4. Specifically, one sub-beam from the first light source unit 101 and one sub-beam from the first light source unit 102 are combined by the first polarizing light combining element 4 to form one path of first-color light, and the other sub-beam from the first light source unit 101 and the other sub-beam from the first light source unit 102 are combined by the first polarizing light combining element 4 to form another path of first-color light. Similarly, the third light source 3 emits two paths of third-color light guided by the second polarizing light combining element 5. Specifically, one sub-beam from the third light source unit 301 and one sub-beam from the third light source unit 302 are combined by the second polarizing light combining element 5 to form one path of third-color light, and the other sub-beam from the third light source unit 301... The beam forms a single path of third color light; the second light source 2 is guided by the first wavelength combining element 8 to emit two paths of second color light. The two sub-beams emitted by the second light source 2 are reflected by the two first wavelength combining elements 8 and combined with the two sub-beams of the two second light sources 2 to form two paths of color light respectively; the two paths of first color light, two paths of second color light, and two paths of third color light are guided by the second wavelength combining element 9 to overlap and form two paths of overlapping color light. That is, one path of first color light, one path of second color light, and one path of third color light from the two paths of first color light, two paths of second color light, and two paths of third color light are guided by the second wavelength combining element 9 to overlap and form one path of overlapping color light. Another path of first color light, another path of second color light, and another path of third color light from the two paths of first color light, two paths of second color light, and two paths of third color light are guided by the second wavelength combining element 9 to overlap and form another path of overlapping color light.
[0046] The second and third colors of light combined by the first wavelength light combining element 8 are guided to the second wavelength light combining element 9 by the third reflective element 14. The third reflective element 14 can more easily guide the second and third colors of light to the second wavelength light combining element 9, reducing the space occupied by multiple elements. The first reflective element 12, the second reflective element 13 and the third reflective element 14 can all be reflectors.
[0047] The first light source 1 is individually temperature-controlled by temperature control component one, while the second light source 2 and the third light source 3 are temperature-controlled by temperature control component two. In this embodiment, the first light source 1 emits red light. The laser diode that emits red light requires a lower temperature to maintain the reliability of the light source output. Therefore, the first light source 1 is set separately on the first side and its temperature is controlled by a separate temperature control component to better dissipate heat from the first light source 1. The second light source 2 and the third light source 3 generate less heat than the first light source 1. Therefore, temperature control component two is used to cool the second light source 2 and the third light source 3 simultaneously, which can reduce the number of temperature control components and save space.
[0048] In this embodiment, the dissipation element 18 is disposed on the output light path of the second wavelength combining element 9. The dissipation element 18 is used to reduce the laser speckle of the combined light beam of the first light source 1, the second light source 2 and the third light source 3.
[0049] In this embodiment, a total of one diffusion element 15 is provided. The diffusion element 15 is disposed in the outgoing light path of the first wavelength combining element 8. Specifically, the diffusion element 15 is located between the first wavelength combining element 8 and the third reflecting element 14. Since the divergence angle of the first color light is larger and the divergence angle of the second color light and the third color light is smaller, the diffusion element 15 makes the divergence angle of the second color light and the third color light larger, so that the light spot size formed by the combination of the first color light, the second color light and the third color light is more consistent. The diffusion element 15 can be provided in the corresponding outgoing light path according to different usage requirements.
[0050] Example 2
[0051] like Figure 2 As shown, the difference between this embodiment and Embodiment 1 is that:
[0052] In this embodiment, the first light source unit 101, the second light source unit 102, the second light source 2, and the third light source unit 301 each include two parallel sub-beams, which are spaced apart perpendicular to the first direction, such as... Figure 2 As shown, in this embodiment, the direction perpendicular to the first direction is Figure 2 In the direction perpendicular to the paper and pointing inward, two sub-beams are guided to the first direction through the same element. By distributing the two sub-beams at intervals in the direction perpendicular to the first direction and passing them through the same element, the number of elements used can be reduced, the distance between the first light source 1, the second light source 2, and the third light source unit 301 can be reduced, making the space more compact, the cost lower, and the structure simpler.
[0053] In this embodiment, there are two wavelength combining elements: a third wavelength combining element 10 and a fourth wavelength combining element 11. The third wavelength combining element 10 is used to transmit the third color light and reflect the first color light, while the fourth wavelength combining element 11 is used to transmit the first color light and the third color light and reflect the second color light.
[0054] The first light source unit 101 and the second light source unit 102 are guided to the first direction by different elements. Specifically, the first light source unit 101 is guided to the first direction by the third polarization light combining element 6, and the second light source unit 102 is guided to the first direction by the third wavelength light combining element 10 and emitted towards the third polarization light combining element 6. The light is then combined with the light emitted by the first light source unit 101 by the third polarization light combining element 6 and emitted.
[0055] The light emitted from the second light source 2 is guided to the first direction by the fourth wavelength light combining element 11. The fourth polarization light combining element 7 is disposed between the third wavelength light combining element 10 and the third polarization light combining element 6. The light emitted from the first light source unit 102 is guided to the first direction by the third wavelength light combining element 10, then transmitted and combined by the fourth wavelength light combining element 11, and then emitted to the third polarization light combining element 6. Finally, it is transmitted through the third polarization light combining element 6 and emitted to the dissipation element 18.
[0056] The light emitted from the third light source unit 101 and the third light source unit 202 is combined and guided to the first direction by the same fourth polarization combining element 7, and then emitted towards the third wavelength combining element 10. After being transmitted through the fourth wavelength combining element 11 and the third polarization combining element 6, the light is emitted along the first direction. It is worth noting that the light emitted from the first light source unit 101 and the first light source unit 102 towards the third polarization combining element 6 is in the P-state and the S-state, respectively (or the light emitted from the first light source unit 101 and the first light source unit 102 towards the third polarization combining element 6 is in the S-state). The light emitted by the third light source unit 1 (301) and the third light source unit 2 (302) to the fourth polarization combining element 7 is in the P state and the S state, respectively (or the light emitted by the third light source unit 1 (301) and the third light source unit 2 (302) to the fourth polarization combining element 7 is in the S state and the P state, respectively). The polarization state selection of the fourth polarization combining element 7 only applies to the first color light emitted by the first light source 1. The light emitted by the second light source 2 and the third light source 3 is not affected by the fourth polarization combining element 7. That is, the light emitted by the second light source 2 and the third light source 3 is completely transmitted through the fourth polarization combining element 7.
[0057] The second light source 2 and the third light source unit 301 are staggered from the first light source unit 101 and the first light source unit 2 102 in the first direction. That is, the third light source unit 301, the first light source unit 2 102, the third light source 3, and the first light source unit 101 are arranged sequentially along the first direction. The first light source unit 101 and the first light source unit 2 102 are located on the first side of the first direction, and the second light source 2 and the third light source unit 301 are located on the second side of the first direction. In this embodiment, the first side is... Figure 2 Below the middle, the second side is located Figure 2 Above, this staggered arrangement facilitates the installation of each component. Positioning the second light source 2 opposite the first light source unit 101, and the third light source unit 301 opposite the first light source unit 102, necessitates that each component be positioned perpendicular to the first direction. This increases the distance between the second light source 2 and the third light source unit 301 and the first light source unit 101 and the first light source unit 102. Here, "perpendicular to the first direction" refers to... Figure 2 The up and down directions in the middle.
[0058] like Figure 2and Figure 4 As shown, in this embodiment, the first light source 1 is guided by the third polarization combining element 6 to emit two paths of first color light; the third light source 3 is guided by the third polarization combining element to emit three paths of third color light, that is, the two sub-beams emitted by the third light source unit 1 301 and the three sub-beams emitted by the third light source unit 2 302 are combined by the fourth polarization combining element 7 to form three paths of third color light; the two sub-beams emitted by the second light source 2 are guided by the fourth wavelength combining element 11 to emit two paths of second color light; two of the two paths of first color light, two paths of second color light, and three paths of third color light overlap to form two paths of overlapping color light, and the other path of third color light forms a separate path of color light.
[0059] In this embodiment, there are two diffusion elements: a first diffusion element 16 and a second diffusion element 17. The first diffusion element 16 is disposed between the fourth polarization combining element 7 and the third wavelength combining element 10. The first diffusion element 16 is used to increase the divergence angle of the third color light. The second diffusion element 17 is disposed between the fourth wavelength combining element 11 and the second light source 2. The second diffusion element 17 is used to increase the divergence angle of the second color light. By using the first diffusion element 16 and the second diffusion element 17, the difference between the divergence angle of the third color light and the second color light and the divergence angle of the first color light is small, which makes it easier to make the light spot size formed by the combination of the first color light, the second color light and the third color light more consistent.
[0060] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.
Claims
1. A projection system, characterized in that, Includes a first light source, a second light source, a third light source, and a light combining component; The first light source emits a first color light, the second light source emits a second color light, and the third light source emits a third color light. The first light source, the second light source, and the third light source are all laser far-field light sources. The light combining component includes a polarization conversion element, a polarization light combining element, and a wavelength light combining element. The first light source is disposed on the first side of the first direction, the second light source is disposed on the second side of the first direction, and the third light source includes a third light source unit one and a third light source unit two. The third light source unit one is disposed on the second side of the first direction, and the third light source unit two is disposed on the second side of the first direction or at the tail end of the first direction. At least one of the first light source, the second light source, and the third light source includes two paths of emitted light of the same color. One of the paths of emitted light of the same color is provided with the polarization conversion element so that after switching the polarization state, it is combined with the other path of emitted light of the same color through a polarization combining element to form a single path. The wavelength combining element transmits at least one of the first color light, the second color light, and the third color light while reflecting at least one other color light, and the different colors of light directed toward the wavelength combining element are combined and emitted.
2. The projection system according to claim 1, characterized in that, The first light source includes a first light source unit one and a first light source unit two. A first polarization conversion element is provided in the optical path of the light emitted from the first light source unit one and the first light source unit two. The first polarization conversion element converts the light emitted from the first light source unit one and the first light source unit two into different polarization states, and combines the light into a single emission path through a first polarization combining element. A second polarization conversion element is provided in the optical path of the emitted light from the third light source unit 1 and the third light source unit 2. The second polarization conversion element converts the emitted light from the third light source unit 1 and the third light source unit 2 into different polarization states, and combines the light into a single path through the second polarization combining element and emits it out of the wavelength combining element. The first, second, and third colored lights emitted to the wavelength combining element are combined into a single output.
3. A projection system according to claim 1, characterized in that, At least one of the first light source, the second light source, and the third light source includes two parallel sub-beams, the two sub-beams are spaced apart in a first direction, and the two sub-beams are guided to the first direction by different or the same elements respectively; Alternatively, the two sub-beams are spaced apart in a direction perpendicular to the first direction, and the two sub-beams are guided to the first direction by the same element.
4. A projection system according to claim 3, characterized in that, The two sub-beams of each of the first light source, the second light source, and the third light source are distributed at intervals in a first direction; Alternatively, the two sub-beams of each of the first, second, and third light sources are distributed at intervals perpendicular to the first direction.
5. A projection system according to claim 1, characterized in that, The first light source is guided by the polarizing light combining element to emit two paths of first-color light; The second light source is guided by the wavelength combining element to emit two paths of second-color light; The third light source is guided by the polarizing light combining element to emit two paths of third-color light; Two primary color lights, two secondary color lights, and two tertiary color lights are guided to overlap by the wavelength combining element.
6. A projection system according to claim 3, characterized in that, At least one of the first light source, the second light source, and the third light source is provided. Two sub-beams are distributed at intervals in a first direction. The two sub-beams are guided to the first direction by different elements. The element in the optical path of one sub-beam is a polarizing beam combiner to combine with another outgoing beam to form a single outgoing beam. The element in the optical path of the other sub-beam is a reflecting element.
7. A projection system according to claim 6, characterized in that, Two sub-beams, guided to the first direction by different elements, are then guided to the wavelength combining element by a reflective element.
8. A projection system according to claim 2, characterized in that, The first light source unit 1 and the first light source unit 2 are guided to the first direction by different elements. The element in the optical path of one of the light source units is a wavelength combining element, which combines with another color of light to emit light in one path. The element in the optical path of the other light source unit is a polarization combining element.
9. A projection system according to claim 2, characterized in that, The second light source and the third light source unit are arranged in a staggered manner from the first light source unit and the first light source unit 2 in a first direction.
10. A projection system according to any one of claims 1-9, characterized in that, Also includes: Temperature control component one and temperature control component two are provided. Temperature control component one is disposed next to the first light source to control the temperature of the first light source. Temperature control component two is disposed next to the second light source and / or the third light source to control the temperature of the second light source and the third light source.
11. A projection system according to claim 10, characterized in that, The light-combining component has a dissipation element installed on the light-output path of the light-combining component.
12. A projection system according to claim 11, characterized in that, A diffusion element is provided in the output light path of at least one of the first light source, the second light source, and the third light source, and / or a diffusion element is provided in the output light path of the wavelength combining element.