TW202014789A - Illumination system - Google Patents

Abstract

An illumination system includes at least two laser light sources, a plurality of reflective mirrors respectively corresponding to the two laser light sources, a beam splitter, and a wavelength conversion device. Each of the laser light sources includes a plurality of light-emitting devices. The reflective mirrors respectively corresponding to the two laser light sources are respectively disposed on downstream light paths of the corresponding light-emitting devices. The beam splitter is disposed on downstream light paths of the reflective mirrors. The wavelength conversion device includes a phosphor layer disposed on a downstream light path of the beam splitter, and is fixed.

Description

Lighting system

The invention relates to an optical system, and in particular to an illumination system applicable to a projector.

In the field of display technology, the projection device has a characteristic of projecting an image to a position other than the display element and can generate an image of a size different from that of the display element, and therefore occupies a position that cannot be replaced. For example, a projection device can produce a much larger image frame with a smaller device size. This feature is unmatched by advanced displays such as liquid crystal displays or organic light-emitting diode displays.

In order to make the projection device produce a color image, a conventional technique is to use a color wheel that can rotate in the illumination system of the projection device. When the areas of different colors of the color wheel are sequentially cut into the path of the light beams, light beams of different colors can be generated, and then light beams of a specific color can be synthesized by the length of time that different colors are displayed. However, the motor moving parts used to rotate the color wheel will reduce the reliability of the system, and the gap between the areas of different colors in the color wheel will also cause a loss of light energy.

In addition, in a projector that requires high brightness and uses a diode chip as a light source, in order to provide a beam of sufficient intensity, in addition to using higher power chips, increasing the number of chips is another feasible approach. However, the multiple light beams emitted by the diode chip array are likely to cause the lens area for collecting these light beams to be too large, which makes it difficult to reduce the size of the lighting system.

In an embodiment of the present invention, a lighting system is provided, the architecture of which is helpful to reduce the volume or improve the uniformity of lighting.

An embodiment of the present invention provides an illumination system including two laser light sources, a plurality of reflectors corresponding to the two laser light sources, and a beam splitter. The two laser light sources each include a plurality of light-emitting elements, and a plurality of reflectors respectively corresponding to the two laser light sources are respectively disposed downstream of the light path of the corresponding light-emitting elements. The beam splitter is provided downstream of the light path of these mirrors.

An embodiment of the present invention provides an illumination system including three collimated light sources, a fixed substrate, a phosphor layer, two beam splitters, and two diffusion sheets. The fixed substrate is provided downstream of the optical path of one of the collimated light sources, and a reflective surface is provided on the substrate. The phosphor layer is provided on the reflective surface of the substrate. One of the beam splitters is located downstream of the optical path of the one collimated light source, the other collimated light source, and the reflective surface of the substrate. The other beam splitter is located downstream of the optical path of the other collimated light source, and downstream of the beam path of the aforementioned beam splitter. The two diffusion plates are respectively disposed on the optical path between the two collimated light sources and the beam splitter downstream of the optical path.

In the lighting system of the embodiment of the present invention, since a plurality of reflectors are used to change the spatial distribution of the multiple light beams emitted by the laser light source, the area of the lens for receiving these light beams can be relatively small, thereby achieving shrinkage The effect of volume. In addition, in the lighting system of the embodiment of the present invention, since the diffuser is used to make the light beam emitted by the collimated light source uniform, the uniformity of the lighting can be improved, and thus the projection device using the lighting system can be improved. The quality of the image.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

FIG. 1 is a schematic diagram of an optical path of a projection device and an illumination system therein according to an embodiment of the invention. For example, in a light source in a projection device according to an embodiment of the present invention, since multiple reflectors are used to change the spatial distribution of multiple light beams emitted by the light source, the lenses 442, 452 for receiving these light beams The area of 462 can be relatively small, so as to achieve the effect of reducing the volume. The design of the projection device of the present invention will be described below.

Please refer to FIG. 1. The projection device 500 of this embodiment includes an illumination system 400, a light valve 510 and a projection lens 520.

The lighting system 400 of this embodiment includes a light source group 100, 200, 300, a fixed wavelength conversion element 430, a beam splitter 410, a beam splitter 420, a diffusion sheet 446, 456, 466, lenses 442, 444, 472, 474, 452 , 454, 464, and 476, a light homogenizing element 484, and a light 486.

The fixed wavelength conversion element 430 is not rotatable such as a color wheel or a fluorescent wheel. The fixed wavelength conversion element 430 includes a fixed substrate 432 and a phosphor layer 434. The fixed substrate 432 is, for example, a metal or ceramic substrate on which a reflective surface 431 is provided. In this example, the fixed substrate 432 is a metal substrate, and is not a rotating disk or a mobile substrate. In addition, in this embodiment, the phosphor layer 434 may include phosphors of various colors, such as phosphors that can absorb red and green light beams of shorter wavelengths after absorbing blue light or UV light of shorter wavelengths. In the example, the phosphor layer 434 is a green phosphor layer that can be excited by blue light to output green light.

The dichroic mirror 410 and the dichroic mirror 420 may be dichroic mirrors or elements such as an X-type light combining lens, a light combining lens set, a polar filter (PBS), or the like. In this embodiment, the dichroic mirror 410 and the dichroic mirror 420 are dichroic mirrors, which can reflect light in a specific wavelength range and allow light in other wavelength ranges to pass through. For example, the beam splitter 410 can reflect blue light and pass green light, and the beam splitter 420 can reflect red light and pass blue light and green light.

Diffusers 446, 456, and 466 can be optical films or elements with diffused particles or diffused microstructures, which can increase the divergence angle of each beam to reduce the speckle phenomenon of laser light. It should be noted that diffusers 446, 456 and 466 are not limited to flakes. Furthermore, the diffusion sheet can expand the diffusion angle of each incident beam, so that the beam spot can evenly illuminate the phosphor layer.

In this embodiment, the light homogenizing element 484 may be an optical element such as a light integration rod, a lens array, a fly-eye lens (Fly-eye), etc., which can make the light uniform. In this example, the light homogenizing element 484 is a compound eye lens.

The optical element 486 can be a field lens, prism, mirror, etc. In this example, the optical element 486 is a total internal reflection prism (total internal reflection prism, TIR prism), but according to the design, it can also be a single reflection It can also be replaced by total internal reflection.

The light source groups 100, 200 and 300 can be a collimated light source, which can output a collimated light, which can be a laser light source or collimated by an optical element, such as an LED or other conventional light sources. Furthermore, in this example, the design of the light source group 100, 200, 300, except that the color and power of the light-emitting elements are slightly different, the structure is approximately the same, but it is not limited to the same. In this example, the light source groups 100, 200, and 300 can output a blue light beam 101, a blue light beam 201, and a red light beam 301, respectively.

Taking the light source group 100 as an example, please refer to FIGS. 2A to 2D. FIG. 2A is a schematic diagram of the light source group in FIG. 1, FIG. 2B is a schematic front view of the reflector in FIG. 2A, and FIG. 2C is a light source group in FIG. 2D is a schematic view of the image seen when viewing the lighting system from the lens of FIG. 2A toward the -z direction. In this example, the light source group 100 may include multiple laser light sources, each of which is a collimated light source. In this example, each laser light source in the light source group 100 is a laser module ( LASER BANK) 110, 120, 130, 140 and a plurality of mirror groups 150, 160, 170, 180.

In this example, the structures of the laser modules 110, 120, 130, and 140 in the light source group 100 are the same, and so are the plural mirror groups 150, 160, 170, and 180.

In this example, each laser module 110, 120, 130, 140 may include a plurality of light emitting elements 112, 122, 132, 142 having the same structure. Taking the laser module 110 as an example, the laser module 110 includes a plurality of light-emitting elements 112, and each light-emitting element 112 is arranged in a matrix of 2*4. The light emitting element 112 may be, for example, a packaged laser diode (LD) or light emitting diode (LED) module and includes at least one blue laser chip, which may output a blue laser beam. Since the excitation efficiency of the phosphor is proportional to the energy density, the higher the optical power received by the phosphor, the higher the conversion efficiency. The power of each laser module 110, 120, 130, 140 has good effect when it is above 10 watts, it has better effect when it is above 20 watts, it has better effect when it is above 30 watts, and it is above 100 watts Below 1000 watts, the best results are obtained. The total energy consumption of each light source group 100 in the projector has a basic effect when it is more than 40 watts, a better effect when it is more than 80 watts, and a better effect when it is more than 120 watts, more than 400 watts, and less than 1000 watts Time is best. In this example, the power consumption of the laser modules 110, 120, 130, 140 is about 95 watts, respectively.

In this embodiment, each mirror group 150, 160, 170, 180 is the same in structure, and may include a plurality of mirrors 152, 162, 172, 182, and each mirror has a reflective surface to Reflecting light, the reflective surface can be flat. The plurality of reflecting mirrors 152 may be independent elements separated by the gap 154 or each reflecting part of a gap mirror (STRIPE MIRROR). Taking the mirror group 150 as an example, the mirror group 150 is a gap mirror/space mirror (STRIPE MIRROR). As depicted in Figures 2A and 2B. The spacer mirror 150 may include a plurality of reflectors 152 and a plurality of gaps 154, as shown in FIGS. 2A and 2B. The mirrors 152 are interleaved with the gaps 154. Similarly, the interval mirror 160 may include a plurality of mirrors 162 and a plurality of gaps 164, and the mirrors 162 and the gaps 164 are alternately arranged. The design of the interval mirror 170 and the interval mirror 180 are also the same as described above. In this embodiment, each mirror 152 is provided downstream of the light path of each light-emitting element 112, and the mirror 162 is provided downstream of the light path of each light-emitting element 122, respectively. The design of the interval mirror 170 and the interval mirror 180 are also the same. As depicted in FIG. 2A, the mirror group 150 is disposed downstream of the optical path of the mirror group 160 and the reflection part of the mirror group 160 corresponds to the light-transmitting part of the mirror group 150. The length in the X-axis direction can accommodate twice the light source. If the structure in the X-axis direction, as shown in FIG. 2A, the laser modules 110 and 130 are regarded as the first horizontal row, the laser modules 120 and 140 are the first. In the second horizontal row, when the light source group 100 is farthest from the lens 442 in the light exit direction, since the horizontal mirror group does not need to allow light to pass through, two planar mirrors with a complete continuous reflection surface can be used to Instead of the spacer mirrors 160 and 180, respectively. Furthermore, in addition to the two-row design of FIG. 2A, by adjusting the width of each mirror, a three-row or four-row structure can be further configured to further increase the optical density.

The combination of the laser modules 110 and 120 and the reflection modules 150 and 160, and the combination of the laser modules 130 and 140 and the reflection modules 170 and 180 are mirror-symmetrical. In more detail, please refer to FIG. 2D. Originally, the first laser module 110 and the second laser light source 120 could be provided with four rows of light-emitting elements 112 and 122 within a unit width W1 of twice, but the reflector 152 and The mirror 162 causes the light beams 111 and 121 to intersect each other. When viewed from the lens 442 in the -z direction, the effect of the images of the four rows of light-emitting elements 112 and 122 in one unit width W1 can be seen. That is to say, through the function of these mirrors 152 and these mirrors 162, the width of the light source can be reduced to 1/2 of the original, so that the diameter of the lens 442 can be effectively reduced, thereby achieving the reduction of the overall system size and cost . Similarly, the reflector 172 and the reflector 182 can also reduce the width of the light source. In addition, if the structure of the X-axis direction, as shown in FIG. 2A, the laser modules 110 and 130 are regarded as the first horizontal row, and the laser modules 120 and 140 are the second horizontal row, when the light source group 100 leaves the light emitting direction Since the farthest mirror of the lens 442 does not need to allow light to pass through, two plane mirrors with complete continuous reflection surfaces can be used to replace the interval mirrors 160 and 180, respectively. By this, the diameter of the lens 442 can be minimized.

The relative position and operation mode of each component will be described below.

The fixed substrate 432 is disposed downstream of the light path of the light source group 100, and the phosphor layer 434 is disposed on the reflective surface 431 of the substrate 432. The fixed substrate 432 and the phosphor layer 434 can form a wavelength conversion element 430, which is disposed downstream of the optical path of the dichroic mirror 410, and the wavelength conversion element 430 is also fixed and non-rotatable, that is, the wavelength conversion element 430 is not Rotatable fluorescent wheel or removable fluorescent substrate.

In addition, the dichroic mirror 410 is disposed downstream of the optical paths of the mirrors 152 and the mirrors 162, and the mirrors 152 and the mirrors 162 are disposed on the same side of the dichroic mirror 410. In this embodiment, the laser module 110 is located between the beam splitter 410 and the laser light source 120, and the mirrors 152 are located between the beam splitter 410 and the mirrors 162. In other words, the laser light group 110 and the laser module 120 are provided at the same time in the upstream direction of the dichroic mirror 410 on the same light incident side. The light emitted by the light emitting elements 112 forms a light beam 111, and the light beam 111 is reflected by the mirror 152 to the beam splitter 410. On the other hand, the light emitted by the light-emitting elements 122 forms a light beam 121, which is reflected by the mirrors 162 toward the mirror 152, and then the light beam 121 penetrates the mirror 152 through the gap 154 and is transmitted to the beam splitter 410.

In this embodiment, the blue light beam 111 emitted by the laser module 110 and the blue light beam 121 emitted by the laser light source 120 are reflected by the beam splitter 410 to fluorescent light when they are transmitted to the beam splitter 410 The powder layer excites a green light beam 433. After the green light beam 433 passes back to the beam splitter 410, it passes through the beam splitter 410.

In this embodiment, the configuration of the laser light source 130, the reflector 172, the laser light source 140 and the reflector 182 may be similar to the configuration of the laser module 110, the reflector 152, the laser light source 120 and the reflector 162, for example The two are mirror images of each other. The mirrors 172 and the mirrors 182 can be implemented as a spacer mirror like the spacer mirror 150. Specifically, the laser light source 130 includes a plurality of light-emitting elements, and the reflectors 172 are provided downstream of the light paths of the light-emitting elements. The laser light source 140 includes a plurality of light-emitting elements, and the reflectors 182 are disposed downstream of the light paths of the light-emitting elements. The laser light source 130 and the laser module 110 face each other, the laser light source 140 and the laser light source 120 face each other, the laser light source 130 is located between the dichroic mirror 410 and the laser light source 140, and the reflectors 172 are located The beam splitter 410 is between the mirrors 182, and the beam splitter 410 is also disposed downstream of the optical paths of the mirrors 172 and the mirrors 182.

In addition, in this embodiment, the reflectors 152 are located between the laser module 110 and the reflectors 172, and the reflectors 172 are located between the laser light source 130 and the reflectors 152. The reflectors 162 are located between the laser light source 120 and the reflectors 182, and the reflectors 182 are located between the laser light source 140 and the reflectors 162.

Similarly, in this embodiment, the light beam 131 emitted by the laser light source 130 is reflected by the mirrors 172 to the beam splitter 410. On the other hand, the light beam 141 emitted by the laser light source 140 is reflected by these mirrors 182 toward the mirror 172, and then the light beam 141 passes through the mirror 172 through the gap 174 and is transmitted to the beam splitter 410. In this embodiment, the blue light beam 131 emitted by the laser light source 130 and the blue light beam 141 emitted by the laser light source 140 are reflected by the beam splitter 410 to phosphor when they are transmitted to the beam splitter 410 Layer 434, and a green light beam 433 is excited. In other words, the light beams 111, 121, 131, and 141 can be regarded as a blue light beam 101 as a whole, which is reflected by the beam splitter 410 to the phosphor layer 434, and the green light beam 433 is excited.

In this embodiment, the dichroic mirror 410 is disposed downstream of the light path of the light source group 100, the light source group 200, and the reflective surface 431 of the substrate 432, and the dichroic mirror 420 is disposed downstream of the light path of the light source 300 and downstream of the dichroic mirror 410 . In this embodiment, the beam splitter 410 reflects the blue light beam 201 emitted by the laser light source group 200 to the beam splitter 420 and passes the green light beam 431 from the phosphor layer 434 to the beam splitter 420 . The beam splitter 420 reflects the red beam 301 emitted by the light source 300, and passes the beam 201 emitted by the light source group 200 and reflected by the beam splitter 410 and the beam 431 from the phosphor layer 434. In this way, the red light beam 301, the green light beam 431 and the blue light beam 201 can be combined by the dichroic mirror 420 into an illumination light beam 401.

The illuminating light beam 401 from the beam splitter 420 is irradiated onto the light valve 510 through the light beam 486 after being homogenized and shaped by the light homogenizing element, so as to produce an illumination effect on the light valve 510. The light valve 510 modulates the illumination light beam 401 into an image light beam 512, and the image light beam 512 is transmitted to the projection lens 520 through the red light 486. The projection lens 520 projects the image beam 512 on the imaging surface (for example, a screen is provided at the imaging surface) to form an image frame. In this embodiment, the light source groups 100, 200, and 300 can emit light at the same time or in turns, so that the illumination light beam 401 alternately exhibits red, green, blue, or a combination of colors, such as white, for example. No need for moving parts such as color wheel or fluorescent wheel to form a color picture. In this way, the lighting system 400 of this embodiment can avoid the problem of reduced reliability caused by the use of moving parts, and can eliminate the problem of loss of light energy caused by the gap between the regions of different colors in the color wheel.

In this embodiment, the diffusion sheet 446 is disposed on the optical path between the light source group 100 and the dichroic mirror 410, the diffusion sheet 456 is disposed on the optical path between the light source group 200 and the dichroic mirror 410, and the diffusion sheet 466 is disposed on The optical path of the light source 300 and the dichroic mirror 420. The diffusion sheets 446, 456, and 466 can make the beams 101, 201, and 301 more uniform to improve the speckle phenomenon caused by the laser beam.

In this embodiment, the lenses 442 and 444 are sequentially arranged on the optical path between the light source group 100 and the diffusion sheet 446, the lenses 472 and 474 are arranged on the optical path between the wavelength conversion element 430 and the beam splitter 410, the lens 452 and 454 are sequentially arranged on the optical path between the light source group 200 and the diffusion sheet 456, lenses 462 and 464 are sequentially arranged on the optical path between the light source 300 and the diffusion sheet 466, and the lens 476 is arranged on the beam splitter 420 On the optical path with the light homogenizing element 484. These lenses can provide the function of condensing light or changing the beam cone angle.

In this embodiment, the light source group 100, the light source group 200, and the light source 300 are, for example, a first collimated light source, a second collimated light source, and a third collimated light source, and the dichroic mirror 410 and the dichroic mirror 420 are, for example, the first beam splitter For the mirror and the second beam splitter, the diffusion sheets 446, 456, and 466 are, for example, first, second, and third diffusion sheets, respectively. In this embodiment, the laser modules 110, 120, 130, and 140 are, for example, first, second, third, and fourth laser light sources, respectively. However, in other embodiments, the laser modules 110, 120, 130, and 140 may be first, third, second, and fourth laser light sources, respectively. In this embodiment, the mirrors 152, 162, 172, and 182 are, for example, first, second, third, and fourth mirrors, respectively. However, in other embodiments, the mirrors 152, 162, 172, and 182 may be first, third, second, and fourth mirrors, respectively. In this embodiment, the interval mirrors 150, 160, 170, and 180 are, for example, first, second, third, and fourth interval mirrors, respectively. However, in other embodiments, the interval mirrors 150, 160, 170, and 180 may be first, third, second, and fourth interval mirrors, respectively.

FIG. 3A illustrates another embodiment of the collimated light source in FIG. 1, FIG. 3B is a schematic front view of the laser light source in FIG. 3A, and FIG. 3C is viewed from the lens of FIG. 3A when viewing the lighting system in the -z direction. To the image of the image. Please refer to FIGS. 3A to 3C. The collimated light source of this embodiment is similar to the collimated light source shown in FIG. 2A, and the difference between the two is as follows. The collimated light source of this embodiment can be used as the light source groups 100, 200, and 300 in FIG. 1, and the light source group 100 will be described as an example below. The collimated light source of this embodiment includes a stepped structure 150a and a stepped structure 170a. The stepped structure 150a includes a plurality of reflectors 152a, wherein the reflectors 152a are arranged parallel to each other. In addition, the stepped structure 170a may be arranged in a mirror image with respect to the stepped structure 150a. The stepped structure 170a includes a plurality of mirrors 172a, wherein the mirrors 172a are arranged parallel to each other. The mirror 152a can reflect the light beams emitted by the laser modules 110a and 110b to the lens 442, and the mirror 172a can reflect the light beams emitted by the laser light sources 130a and 130b to the lens 442. In this embodiment, the laser modules 110a and 110b are arranged along the y direction. Originally, in the unit width W2 along the z direction, the laser modules 110a and 110b were provided with four rows of light emitting elements 112a and 112b. However, under the action of the stepped structure 150a, the lens 442 can be viewed from the -z direction There are images of the four rows of light-emitting elements 112a and 112b in a unit width W2 of 1/2 times. In other words, the stepped structure 150a reduces the width of the light source to 1/2 times the original width. In this way, the diameter of the lens 442 can be smaller, thereby reducing the system volume and cost.

In this embodiment, the laser modules 110a, 110b, 130a, and 130b are, for example, first, third, second, and fourth laser light sources, respectively, and the stepped structure 150a and the stepped structure 170a are, for example, first and second, respectively. The second stepped structure, and the mirrors 152a and 172a are, for example, first and second mirrors, respectively.

In summary, in the lighting system of the embodiment of the present invention, since multiple reflectors are used to change the spatial distribution of the multiple beams emitted by the laser light source, the area of the lens used to receive these beams can be compared Small, and then achieve the effect of reducing the volume. In addition, in the lighting system of the embodiment of the present invention, since the diffuser is used to make the light beam emitted by the collimated light source uniform, the uniformity of the lighting can be improved, and thus the projection device using the lighting system can be improved. The quality of the image.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

100, 200, 300: light source groups 101, 111, 121, 131, 141, 201, 301, 433: beams 110, 110a, 110b, 120, 130, 130a, 130b, 140: laser modules 112, 122: light emitting Element 150, 160, 170, 180: spacer mirror 150a, 170a: stepped structure 152, 152a, 162, 172, 172a, 182: mirror 154, 164, 174: gap 400: lighting system 401: illumination beam 410, 420: beam splitter 430: wavelength conversion element 431: reflective surface 432: substrate 434: phosphor layer 442, 444, 452, 454, 462, 464, 472, 474, 476: lens 446, 456, 466: diffuser 484 : Light homogenizing element 486: Optical element 500: Projection device 510: Light valve 512: Image beam 520: Projection lens W1, W2: Unit width x, y, z: Direction

FIG. 1 is a schematic diagram of an optical path of a projection device and an illumination system therein according to an embodiment of the invention. FIG. 2A illustrates the collimated light source in FIG. 1. FIG. 2B is a schematic front view of the reflector in FIG. 2A. 2C is a schematic front view of the laser light source in FIG. 2A. FIG. 2D is a schematic diagram of an image seen when viewing the illumination system from the lens of FIG. 2A toward the -z direction. FIG. 3A illustrates another embodiment of the collimated light source in FIG. 1. 3B is a schematic front view of the laser light source in FIG. 3A. FIG. 3C is a schematic diagram of an image seen when viewing the lighting system from the lens of FIG. 3A in the -z direction.

100: light source group

111, 121, 131, 141: beam

110, 120, 130, 140: laser module

150, 160, 170, 180: interval mirror

152, 162, 172, 182: reflector

154, 164, 174: gap

442: lens

x, y, z: direction

Claims (10)

An illumination system includes: a first laser light source, including a plurality of first light-emitting elements; a plurality of first reflectors, respectively disposed downstream of the optical paths of the plurality of first light-emitting elements; and a second laser light source, including A plurality of second light-emitting elements; a plurality of second reflectors, which are respectively arranged downstream of the optical path of the plurality of second light-emitting elements; and a beam splitter, which are arranged on the plurality of first reflectors and the plurality of second reflectors Downstream of the light path. The lighting system as described in item 1 of the patent application scope further includes a wavelength conversion element, including a phosphor layer, disposed downstream of the beam path of the beam splitter, the wavelength conversion element is fixed and non-rotatable, wherein the first A laser light source is located between the beam splitter and the second laser light source, and the plurality of first mirrors are located between the optical paths of the beam splitter and the plurality of second mirrors. The lighting system as described in item 2 of the scope of the patent application further includes: a third laser light source, including a plurality of third light-emitting elements; a plurality of third reflectors, respectively disposed on the optical paths of the plurality of third light-emitting elements Downstream; a fourth laser light source, including a plurality of fourth light-emitting elements; and a plurality of fourth reflectors, respectively disposed on the optical path of the plurality of fourth light-emitting elements, wherein the third laser light source and the first The laser light sources face each other, the fourth laser light source and the second laser light source face each other, the third laser light source is located between the beam splitter and the fourth laser light source, and the plurality of third reflections The mirror is located between the beam splitter and the plurality of fourth mirrors, and the beam splitter is also disposed downstream of the optical paths of the plurality of third mirrors and the plurality of fourth mirrors. The lighting system according to item 1 of the patent application scope, wherein the first laser light source and the second laser light source face each other, and the plurality of first reflectors are located between the first laser light source and the plurality of Between two mirrors, and the plurality of second mirrors are located between the second laser light source and the plurality of first mirrors. The lighting system as described in item 4 of the patent application scope further includes: a third laser light source, including a plurality of third light-emitting elements; a plurality of third reflectors, respectively disposed on the optical paths of the plurality of third light-emitting elements Downstream; a fourth laser light source, including a plurality of fourth light-emitting elements; and a plurality of fourth reflectors, respectively disposed on the optical path of the plurality of fourth light-emitting elements, wherein the plurality of third reflectors are located on the first Three laser light sources and the plurality of fourth reflectors, the plurality of fourth reflectors are located between the fourth laser light source and the plurality of third reflectors, the plurality of first reflectors are located in the beam splitter Between the mirror and the plurality of third mirrors, the plurality of second mirrors are located between the beam splitter and the plurality of fourth mirrors, and the beam splitter is also disposed between the plurality of third mirrors and the The optical path of the plurality of fourth mirrors is downstream. The lighting system according to any one of the items 2 to 5 of the patent application scope, further comprising: a first interval mirror including the plurality of first reflectors and the plurality of first gaps, wherein the plurality of A first reflector and the plurality of first gaps are interleaved; and a second interval mirror includes the plurality of second mirrors and the plurality of second gaps, wherein the plurality of second mirrors and the plurality of gaps The second gaps are staggered. The lighting system as described in any one of claims 2 to 5 further includes: a first step-like structure including the plurality of first mirrors, wherein the plurality of first mirrors are mutually Arranged in parallel; and a second stepped structure including the plurality of second mirrors, wherein the plurality of second mirrors are arranged parallel to each other. An illumination system includes: a first collimated light source; a second collimated light source; a third collimated light source; a fixed substrate provided downstream of the optical path of the first collimated light source and provided on the substrate A reflecting surface; a phosphor powder layer, disposed on the reflecting surface of the substrate; a first beam splitter, disposed on the first collimated light source, the second collimating light source, and the optical path of the reflecting surface of the substrate Downstream; a second dichroic mirror, located downstream of the optical path of the third collimated light source, and located downstream of the optical path of the first dichroic mirror; a first diffuser, located at the first collimated light source and the first beam splitter On the optical path between the mirrors; a second diffuser is provided on the optical path between the second collimated light source and the first beam splitter. The lighting system according to item 8 of the patent application scope, wherein the first collimated light source includes: a first laser light source including a plurality of first light-emitting elements; and a plurality of first reflectors, respectively provided on the plurality of Downstream of the optical path of the first light-emitting element; a second laser light source, including a plurality of second light-emitting elements; a plurality of second mirrors, respectively, located downstream of the optical path of the plurality of second light-emitting elements; wherein, the first light splitting The mirrors are arranged downstream of the optical paths of the plurality of first mirrors and the plurality of second mirrors. The plurality of first mirrors and the plurality of second mirrors are arranged on the same side of the first beam splitter. The illumination system as recited in item 8 of the patent application range, wherein the first beam splitter reflects the light beam emitted by the second laser light source and passes a light beam from the phosphor layer, and the second beam splitter reflects the first The light beam emitted by the three collimated light sources and passing the light beam emitted by the second collimated light source.

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