CN111176059A

CN111176059A - Lighting system

Info

Publication number: CN111176059A
Application number: CN201811333726.1A
Authority: CN
Inventors: 林祐震; 陈时伟
Original assignee: Young Optics Inc
Current assignee: Young Optics Inc
Priority date: 2018-11-09
Filing date: 2018-11-09
Publication date: 2020-05-19
Also published as: CN115356887A

Abstract

An illumination system comprises at least two laser light sources, a plurality of reflectors respectively corresponding to the two laser light sources, a spectroscope and a wavelength conversion element. The two laser light sources respectively comprise a plurality of light-emitting elements, and a plurality of reflectors respectively corresponding to the two laser light sources are respectively arranged on the downstream of the optical paths of the corresponding light-emitting elements. A beam splitter is positioned in the optical path downstream of the mirrors. The wavelength conversion element comprises a fluorescent powder layer which is arranged at the downstream of the optical path of the spectroscope, and the wavelength conversion element is fixed and can not rotate.

Description

Lighting system

Technical Field

The present invention relates to an optical system, and more particularly, to an illumination system applicable to a projector.

Background

In the field of display technology, a projection apparatus has a property of projecting an image to a position other than a display element and generating an image having a size different from that of the display element, and therefore cannot be replaced. For example, the projection device can generate image frames with a much larger size with a smaller device size, which is a characteristic of the liquid crystal display or the organic light emitting diode display that is desired by the currently advanced display.

In order to generate color images by a projection device, a color wheel rotating in an illumination system of the projection device is used in a conventional technique. When the areas with different colors of the color wheel are cut into the path of the light beam in sequence, the light beams with different colors can be generated, and then the light beams with specific colors are synthesized according to the display time of the different colors. However, the motor components used to rotate the color wheel may reduce the reliability of the system, and the gaps between the different color regions in the color wheel may also cause light energy loss.

In addition, in the projectors with high brightness and using diode chips as light sources, it is feasible to increase the number of chips in addition to the higher power chips in order to provide light beams with sufficient intensity. However, the light beams emitted by the diode chip array in an array easily cause an excessively large area of the lens for collecting the light beams, which makes the volume of the illumination system difficult to reduce.

Disclosure of Invention

In one embodiment of the present invention, an illumination system is provided, which is configured to reduce the volume or improve the illumination uniformity.

An embodiment of the present invention provides an illumination system, which includes two laser light sources, and a plurality of reflective mirrors and beam splitters respectively corresponding to the two laser light sources. The two laser light sources respectively comprise a plurality of light-emitting elements, and a plurality of reflectors respectively corresponding to the two laser light sources are respectively arranged on the downstream of the optical paths of the corresponding light-emitting elements. A beam splitter is positioned in the optical path downstream of the mirrors.

An embodiment of the invention provides a lighting system, which includes three collimated light sources, a fixed substrate, a fluorescent powder layer, two beam splitters and two diffusion sheets. The fixed substrate is arranged at the downstream of the light path of one of the collimation light sources, and a reflecting surface is arranged on the substrate. The fluorescent powder layer is arranged on the reflecting surface of the substrate. One of the beam splitters is disposed in the optical path downstream of the one of the collimated light sources, the other of the collimated light sources, and the reflective surface of the substrate. The other beam splitter is arranged downstream of the beam path of the other collimation light source and is arranged downstream of the beam splitter. The two diffusion sheets are respectively arranged on an optical path between the two collimation light sources and the spectroscope downstream of the light path.

In the illumination system of the embodiment of the invention, because the plurality of reflectors are adopted to change the spatial distribution of the plurality of light beams emitted by the laser light source, the area of the lens for receiving the light beams can be smaller, and the effect of reducing the volume is further achieved. In addition, in the illumination system of the embodiment of the invention, the diffusion sheet is adopted to homogenize the light beams emitted by the collimated light source, so that the illumination uniformity can be improved, and the image quality provided by the projection device adopting the illumination system is further improved.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic optical path diagram of a projection apparatus and an illumination system therein according to an embodiment of the invention.

Fig. 2A illustrates the collimated light source of fig. 1.

Fig. 2B is a schematic front view of the mirror in fig. 2A.

Fig. 2C is a schematic front view of the laser light source in fig. 2A.

FIG. 2D is a schematic view of an image viewed from the lens of FIG. 2A looking in the-z direction through the illumination system.

FIG. 3A illustrates another embodiment of the collimated light source of FIG. 1.

Fig. 3B is a schematic front view of the laser light source in fig. 3A.

FIG. 3C is a schematic view of an image seen when the illumination system is viewed from the lens of FIG. 3A in the-z direction.

Detailed Description

Fig. 1 is a schematic optical path diagram of a projection apparatus and an illumination system therein according to an embodiment of the invention. For example, in the light source of the projection apparatus according to an embodiment of the invention, since the plurality of reflective mirrors are used to change the spatial distribution of the plurality of light beams emitted by the light source, the area of the

lenses

442, 452, and 462 for receiving the light beams can be relatively small, thereby achieving the effect of reducing the volume. The following describes the design of the projection apparatus of the present invention.

Referring to fig. 1, a projection apparatus 500 of the present embodiment includes an illumination system 400, a light valve 510, and a projection lens 520.

The illumination system 400 of the present embodiment includes

light source sets

100, 200, 300, a fixed wavelength conversion element 430, a beam splitter 410, a beam splitter 420,

diffusers

446, 456, 466,

lenses

442, 444, 472, 474, 452, 454, 464, and 476, a light uniformizing element 484, and a prism 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 the reflective surface 431 is provided, and in this example, the fixed substrate 432 is a metal substrate, and is not a rotating disk or a moving substrate. In addition, in the present embodiment, the phosphor layer 434 may include phosphors of various colors, such as phosphors that absorb blue light or UV light with a shorter wavelength and can excite red and green light beams with a shorter wavelength, and in this embodiment, the phosphor layer 434 is a green phosphor layer that can be excited by blue light to output green light.

The beam splitter 410 and the beam splitter 420 can be dichroic mirrors (dichroic mirrors) or elements such as X-ray film combiners, beam combiner sets, Polarizing Beam Splitters (PBSs), etc. In the present embodiment, the beam splitter 410 and the beam splitter 420 are dichroic mirrors (dichroic mirrors) capable of reflecting light in a specific wavelength range and allowing light in other wavelength ranges to pass through. For example, the beam splitter 410 may reflect blue light and pass green light, and the beam splitter 420 may reflect red light and pass blue and green light.

The diffusers (diffusers) 446, 456, and 466 may be optical films or elements with diffusing particles or diffusing microstructures, which can increase the divergence angle of each light beam to reduce the speckle (speckle) phenomenon of the laser light. It should be noted that the diffusion sheets (diffusers) 446, 456, and 466 are not limited to sheet-shaped ones. Moreover, the diffusion sheet can enlarge the diffusion angle of each incident light beam, so that the light spots of the light beams can uniformly irradiate on the fluorescent powder layer.

In the present embodiment, the light uniformizing element 484 may be an optical element capable of uniformizing light, such as a light integration rod (light integration rod), a lens array, or a Fly-eye lens (Fly-eye). In this example, the light uniformizing element 484 is a fly eye lens.

The optical element 486 can be a field lens, a prism, a reflector, etc., in this embodiment, the optical element 486 is a total internal reflection prism (TIR prism), but according to the design, a single TIR prism can be used instead.

The light source sets 100, 200, and 300 may each be a collimated light source that outputs collimated light, which may be a laser light source or collimated by an optical element, such as an LED or other conventional light source. In this embodiment, the

light source groups

100, 200, and 300 are designed to have substantially the same structure except that the color and power of the light emitting elements are slightly different, but not limited to the same structure. In this embodiment, the light source sets 100, 200, 300 can output the blue light beam 101, the blue light beam 201, and the red light beam 301, respectively.

Referring to fig. 2A to 2D, fig. 2A is a schematic diagram of the light source set in fig. 1, fig. 2B is a schematic front view of the reflector in fig. 2A, fig. 2C is a schematic front view of the light source set in fig. 2A, and fig. 2D is a schematic diagram of an image seen when the illumination system is viewed from the lens in fig. 2A in the-z direction. In this embodiment, the light source set 100 may include a plurality of LASER light sources, each of which is one of the collimated light sources, in this embodiment, each of the LASER light sources in the light source set 100 is a LASER BANK (LASER BANK)110, 120, 130, 140 and a plurality of reflector sets 150, 160, 170, 180.

In this example, the structures of the

laser modules

110, 120, 130, 140 in the light source group 100 are the same, and the plurality of

mirror groups

150, 160, 170, 180 are also the same.

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 2 × 4 matrix. The light emitting device 112 may be, for example, a packaged Laser Diode (LD) or a Light Emitting Diode (LED) module and includes at least one blue laser chip capable of outputting 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 a good effect when it is above 10 watts, a good effect when it is above 20 watts, a better effect when it is above 30 watts, and a best effect when it is above 100 watts and below 1000 watts. The total energy consumption of each light source group 100 in the projector has a basic effect when the total energy consumption is more than 40 watts, has a better effect when the total energy consumption is more than 80 watts, has a better effect when the total energy consumption is more than 120 watts, and has the best effect when the total energy consumption is more than 400 watts and less than 1000 watts. In this example, the power consumed by the

laser modules

110, 120, 130, 140 is about 95 watts, respectively.

In the present embodiment, each of the

mirror groups

150, 160, 170, 180 is identical in structure and may include a plurality of

mirrors

152, 162, 172, 182, respectively, each of which has a light reflecting surface for reflecting light, and the light reflecting surface may be a plane. And the plurality of MIRRORs 152 may be separate elements separated by gaps 154 or may be reflective portions of a spacer MIRROR (spacer MIRROR). Taking the MIRROR assembly 150 as an example, the MIRROR assembly 150 is a spacer MIRROR (spacer MIRROR). As depicted in fig. 2A and 2B. The spacer mirror 150 may include a plurality of reflective mirrors 152 and a plurality of gaps 154, as shown in fig. 2A and 2B. The reflectors 152 are interleaved with the voids 154. Similarly, the spacer mirror 160 may include a plurality of reflective mirrors 162 and a plurality of gaps 164, and the reflective mirrors 162 are disposed to intersect with the gaps 164. The design of spacer mirror 170 and spacer mirror 180 is also as described above. In the present embodiment, the mirrors 152 are respectively provided downstream of the optical paths of the light emitting elements 112, and the mirrors 162 are respectively provided downstream of the optical paths of the light emitting elements 122. The design of the spacer mirror 170 and the spacer mirror 180 is the same. As illustrated in fig. 2A, the reflector assembly 150 is disposed downstream of the optical path of the reflector assembly 160 and the reflecting portion of the reflector assembly 160 corresponds to the light-transmitting portion of the reflector assembly 150, and two times of light sources can be accommodated under the same length in the X-axis direction, if the structure in the X-axis direction, such as the

laser modules

110 and 130 in fig. 2A are regarded as the first horizontal row and the

laser modules

120 and 140 are regarded as the second horizontal row, then when the reflector assembly in the horizontal row, which is farthest from the lens 442 in the light-emitting direction of the light source assembly 100, does not need to allow light to pass through, two plane reflectors with complete continuous reflecting surfaces can be used to replace the spaced

reflectors

160 and 180, respectively. Furthermore, in addition to the two-row design shown in fig. 2A, by adjusting the width of each reflector, a three-row or four-row structure can be further provided to further increase the optical density.

The combination of

laser modules

110, 120 and

reflective modules

150, 160, and the combination of

laser modules

130, 140 and

reflective modules

170, 180, are left-right mirror symmetric. More specifically, referring to fig. 2D, originally, 4 rows of light-emitting

elements

112 and 122 can be disposed in the unit width W1 which is 2 times of the unit width of the first laser module 110 and the second laser source 120, but the light beams 111 and 121 are mutually inserted by the reflector 152 and the reflector 162, and when viewed from the lens 442 to the-z direction, an image effect of 4 rows of light-emitting

elements

112 and 122 in one unit width W1 can be seen. That is, the width of the light source can be reduced to 1/2 of the original width by the action of the

reflectors

152 and 162, so as to effectively reduce the diameter of the lens 442, thereby achieving the volume reduction and cost reduction of the whole system. Similarly, the

mirrors

172 and 182 can also achieve the effect of reducing the width of the light source. In addition, if the structure in the X-axis direction, such as the

laser modules

110 and 130 in fig. 2A, are regarded as the first row and the

laser modules

120 and 140 are regarded as the second row, then when the reflector farthest from the lens 442 in the light emitting direction of the light source group 100 does not need to let the light pass through, two plane reflectors with complete continuous reflective surfaces may be used to replace the spaced

reflectors

160 and 180, respectively. Thereby, the diameter of the lens 442 can be minimized.

The relative positions and operation of the elements will be described below.

The fixed substrate 432 is disposed downstream of the light source group 100 in the optical path, 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 may form a wavelength conversion element 430, which is disposed downstream of the beam splitter 410 in the optical path, and the wavelength conversion element 430 is also fixed and non-rotatable, i.e., the wavelength conversion element 430 is not a rotatable phosphor wheel or a movable phosphor substrate.

In addition, the beam splitter 410 is disposed downstream of the

reflective mirrors

152 and 162, and the

reflective mirrors

152 and 162 are disposed on the same side of the beam splitter 410. In the present embodiment, the laser module 110 is located between the beam splitter 410 and the laser source 120, and the reflective mirrors 152 are located between the beam splitter 410 and the reflective mirrors 162. In other words, the laser group 110 and the laser module 120 are disposed at the same time in the upstream direction of the same light incident side of the beam splitter 410. The light emitted from the light emitting elements 112 forms a light beam 111, and the light beam 111 is reflected by the reflective mirrors 152 to the beam splitter 410. On the other hand, the light emitted from the light emitting elements 122 forms a light beam 121, the light beam 121 is reflected by the reflective mirrors 162 towards the reflective mirror 152, and then the light beam 121 passes through the reflective mirror 152 via the gap 154 and is transmitted to the beam splitter 410.

In the 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 to the phosphor layer by the beam splitter 410 and excite the green light beam 433 when being transmitted to the beam splitter 410. The green beam 433 passes back to the beam splitter 410 and passes through the beam splitter 410.

In the present embodiment, the laser source 130, the reflective mirror 172, the laser source 140 and the reflective mirror 182 may be configured similarly to the laser module 110, the reflective mirror 152, the laser source 120 and the reflective mirror 162, for example, they are configured as mirror images. The reflective mirrors 172 and the reflective mirrors 182 may be implemented as spaced mirrors like the spaced mirror 150. Specifically, the laser light source 130 includes a plurality of light emitting elements, and the reflective mirrors 172 are respectively 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 reflective mirrors 182 are respectively disposed downstream of the light emitting elements in the optical path. The laser source 130 and the laser module 110 face each other, the laser source 140 and the laser source 120 face each other, the laser source 130 is located between the beam splitter 410 and the laser source 140, the reflective mirrors 172 are located between the beam splitter 410 and the reflective mirrors 182, and the beam splitter 410 is also located downstream of the reflective mirrors 172 and the reflective mirrors 182 in the optical path.

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

Similarly, in the present embodiment, the light beam 131 emitted from the laser source 130 is reflected by the reflective mirrors 172 to the beam splitter 410. On the other hand, the light beam 141 emitted from the laser source 140 is reflected by the reflective mirrors 182 toward the reflective mirror 172, and then the light beam 141 passes through the reflective mirror 172 via the gap 174 and is transmitted to the beam splitter 410. In the 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 the phosphor layer 434 to excite the green light beam 433 when being transmitted to the beam splitter 410. In other words, the light beams 111, 121, 131 and 141 can be regarded as the blue light beam 101, which is reflected by the beam splitter 410 to the phosphor layer 434 to excite the green light beam 433.

In the embodiment, the beam splitter 410 is disposed downstream of the light source set 100, the light source set 200 and the reflective surface 431 of the substrate 432, and the beam splitter 420 is disposed downstream of the light source 300 and the beam splitter 410. In the present embodiment, the beam splitter 410 reflects the blue light beam 201 emitted from the laser light source set 200 to the beam splitter 420, and transmits the green light beam 431 from the phosphor layer 434 to the beam splitter 420. The beam splitter 420 reflects the red light beam 301 emitted from the light source 300, and passes the light beam 201 emitted from the light source set 200 and reflected by the beam splitter 410 and the light 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 into the illumination light beam 401 by the beam splitter 420.

The illumination beam 401 from the beam splitter 420 is homogenized and shaped by the light homogenizing element, and then is irradiated on the light valve 510 by the prism 486 to generate an illumination effect on the light valve 510. The light valve 510 modulates the illumination beam 401 into an image beam 512, and the image beam 512 is transmitted to the projection lens 520 through the prism 486. The projection lens 520 projects the image beam 512 onto an image plane (e.g., a screen is disposed on the image plane) to form an image frame. In this embodiment, the light source sets 100, 200, and 300 can emit light simultaneously or alternately, so that the illumination light beam 401 can alternately show red, green, blue or a combination thereof, such as white, for example, to form a color image without moving components such as a color wheel or a fluorescent wheel. In this way, the illumination system 400 of the present embodiment can avoid the problem of reliability degradation caused by using moving parts, and can avoid the problem of light energy loss caused by gaps between regions of different colors in the color wheel.

In the present embodiment, the diffusion sheet 446 is disposed on the optical path between the light source set 100 and the beam splitter 410, the diffusion sheet 456 is disposed on the optical path between the light source set 200 and the beam splitter 410, and the diffusion sheet 466 is disposed on the optical path between the light source 300 and the beam splitter 420. The

diffusers

446, 456, 466 can make the light beams 101, 201, 301 more uniform to improve the speckle phenomenon generated by the laser beams.

In the present embodiment, the

lenses

442 and 444 are sequentially disposed on the optical path between the light source set 100 and the diffusion sheet 446, the

lenses

472 and 474 are disposed on the optical path between the wavelength converting element 430 and the beam splitter 410, the lenses 452 and 454 are sequentially disposed on the optical path between the light source set 200 and the diffusion sheet 456, the

lenses

462 and 464 are sequentially disposed on the optical path between the light source 300 and the diffusion sheet 466, and the lens 476 is disposed on the optical path between the beam splitter 420 and the light uniformizing element 484. These lenses may provide the function of focusing or changing the cone angle of the beam.

In the present embodiment, the light source set 100, the light source set 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, respectively, the beam splitter 410 and the beam splitter 420 are, for example, a first beam splitter and a second beam splitter, respectively, and the

diffusion sheets

446, 456 and 466 are, for example, a first diffusion sheet, a second diffusion sheet and a third diffusion sheet, respectively. In the present embodiment, the

laser modules

110, 120, 130 and 140 are, for example, a first, a second, a third and a fourth laser light source, respectively. However, in other embodiments, the

laser modules

110, 120, 130, and 140 may be the first, third, second, and fourth laser light sources, respectively. In the present embodiment, the

reflective mirrors

152, 162, 172 and 182 are, for example, first, second, third and fourth reflective mirrors, respectively. However, in other embodiments, the

mirrors

152, 162, 172, and 182 may be first, third, second, and fourth mirrors, respectively. In the present embodiment, the spacing mirrors 150, 160, 170, and 180 are, for example, first, second, third, and fourth spacing mirrors, respectively. However, in other embodiments, the spacing mirrors 150, 160, 170, and 180 may be first, third, second, and fourth spacing mirrors, respectively.

FIG. 3A is a schematic diagram of another embodiment of the collimated light source in FIG. 1, FIG. 3B is a schematic diagram of a front view of the laser light source in FIG. 3A, and FIG. 3C is a schematic diagram of an image seen when the illumination system is viewed from the lens of FIG. 3A in the-z direction. Referring to fig. 3A to 3C, the collimated light source of the present embodiment is similar to the collimated light source illustrated in fig. 2A, and the difference between the two is as follows. The collimated light source of the present embodiment can be used as the light source sets 100, 200, and 300 in fig. 1, and the following description will be given by taking the light source set 100 as an example. The collimated light source of the present embodiment includes a stepped structure 150a and a stepped structure 170 a. The stepped structure 150a includes a plurality of reflective mirrors 152a, wherein the reflective mirrors 152a are arranged in parallel with each other. Further, the stepped structure 170a may be arranged in a mirror image with respect to the stepped structure 150a, and the stepped structure 170a includes a plurality of reflective mirrors 172a, wherein the reflective mirrors 172a are arranged in parallel with each other. The reflective mirror 152a may reflect the light beams emitted by the

laser modules

110a and 110b to the lens 442, and the reflective mirror 172a may reflect the light beams emitted by the

laser light sources

130a and 130b to the lens 442. In the present embodiment, the

laser modules

110a and 110b are arranged along the y-direction. Originally, the

laser modules

110a and 110b have 4 rows of

light emitting elements

112a and 112b in the unit width W2 along the z-direction, however, under the effect of the stepped structure 150a, an image with 4 rows of

light emitting elements

112a and 112b in the unit width W2 which is 1/2 times of the unit width W2 can be observed from the lens 442 to the-z direction. That is, the stepped structure 150a reduces the light source width to 1/2 times of the original width. Thus, the diameter of the lens 442 can be smaller, thereby reducing the system size and cost.

In the present embodiment, the

laser modules

110a, 110b, 130a and 130b are, for example, first, third, second and fourth laser light sources, respectively, the stepped structure 150a and the stepped structure 170a are, for example, first and second stepped structures, respectively, and the

reflective mirrors

152a and 172a are, for example, first and second reflective mirrors, respectively.

In summary, in the illumination system according to the embodiment of the invention, since the plurality of reflective mirrors are used to change the spatial distribution of the plurality of light beams emitted by the laser light source, the area of the lens for receiving the light beams can be smaller, thereby achieving the effect of reducing the volume. In addition, in the illumination system of the embodiment of the invention, the diffusion sheet is adopted to homogenize the light beams emitted by the collimated light source, so that the illumination uniformity can be improved, and the image quality provided by the projection device adopting the illumination system is further improved.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An illumination system, comprising:

a first laser light source including a plurality of first light emitting elements;

a plurality of first reflective mirrors respectively disposed on optical path downstream of the plurality of first light-emitting elements;

a second laser light source including a plurality of second light emitting elements;

a plurality of second reflective mirrors respectively provided downstream of the optical paths of the plurality of second light emitting elements; and

and the spectroscope is arranged on the downstream of the optical paths of the plurality of first reflective mirrors and the plurality of second reflective mirrors.

2. The illumination system of claim 1, further comprising a wavelength conversion element including a phosphor layer disposed in an optical path downstream of the beam splitter, the wavelength conversion element being fixed and non-rotatable, wherein the first laser light source is positioned between the beam splitter and the second laser light source, and the plurality of first reflective mirrors are positioned between the beam splitter and an optical path of the plurality of second reflective mirrors.

3. The illumination system of claim 2, wherein the illumination system further comprises:

a third laser light source including a plurality of third light emitting elements;

a plurality of third reflective mirrors respectively provided downstream of the optical paths of the plurality of third light emitting elements;

a fourth laser light source including a plurality of fourth light emitting elements; and

a plurality of fourth reflective mirrors respectively disposed on optical path downstream of the plurality of fourth light emitting elements,

the third laser light source and the first laser light source 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, the third reflective mirrors are located between the beam splitter and the fourth reflective mirrors, and the beam splitter is also located at the downstream of the optical paths of the third reflective mirrors and the fourth reflective mirrors.

4. The illumination system of claim 1, wherein the first laser light source and the second laser light source face each other, the plurality of first reflective mirrors are positioned between the first laser light source and the plurality of second reflective mirrors, and the plurality of second reflective mirrors are positioned between the second laser light source and the plurality of first reflective mirrors.

5. The illumination system of claim 4, wherein the illumination system further comprises:

and the plurality of fourth reflectors are respectively arranged at the downstream of the optical paths of the plurality of fourth light-emitting elements, wherein the plurality of third reflectors are positioned between the third laser light source and the plurality of fourth reflectors, the plurality of fourth reflectors are positioned between the fourth laser light source and the plurality of third reflectors, the plurality of first reflectors are positioned between the beam splitter and the plurality of third reflectors, the plurality of second reflectors are positioned between the beam splitter and the plurality of fourth reflectors, and the beam splitter is also arranged at the downstream of the optical paths of the plurality of third reflectors and the plurality of fourth reflectors.

6. The illumination system of any one of claims 2 to 5, further comprising:

the first interval reflector comprises a plurality of first reflectors and a plurality of first gaps, wherein the first reflectors and the first gaps are arranged in a staggered manner; and

the second interval reflector comprises a plurality of second reflectors and a plurality of second gaps, wherein the plurality of second reflectors and the plurality of second gaps are arranged in a staggered mode.

7. The illumination system of any one of claims 2 to 5, further comprising:

a first stepped structure including the plurality of first reflective mirrors, wherein the plurality of first reflective mirrors are arranged in parallel with each other; and

and a second stepped structure including the plurality of second reflective mirrors, wherein the plurality of second reflective mirrors are arranged in parallel with each other.

8. An illumination system, comprising:

a first collimated light source;

a second collimated light source;

a third collimated light source;

the fixed substrate is arranged at the downstream of the optical path of the first collimation light source, and a reflecting surface is arranged on the substrate;

the fluorescent powder layer is arranged on the reflecting surface of the substrate;

a first beam splitter disposed in the first collimated light source, the second collimated light source, and downstream of the optical path of the reflective surface of the substrate;

the second spectroscope is arranged at the downstream of the optical path of the third collimation light source and is arranged at the downstream of the optical path of the first spectroscope;

a first diffuser disposed on an optical path between the first collimated light source and the first beam splitter;

and the second diffusion sheet is arranged on an optical path between the second collimation light source and the first spectroscope.

9. The illumination system of claim 8, wherein the first collimated light source comprises:

a plurality of second reflective mirrors respectively provided downstream of the optical paths of the plurality of second light emitting elements;

the first spectroscope is arranged at the downstream of the optical paths of the first reflectors and the second reflectors, and the first reflectors and the second reflectors are arranged at the same side of the first spectroscope.

10. The illumination system of claim 8, wherein the first beam splitter reflects the light beam from the second laser light source and passes the light beam from the phosphor layer, and the second beam splitter reflects the light beam from the third collimated light source and passes the light beam from the second collimated light source.