CN216979567U - Illumination system and projection apparatus - Google Patents

Abstract

The utility model discloses an illumination system and a projection device, wherein the illumination system comprises a first light source, a second light source and a projection device, wherein the first light source emits first wavelength light; the second light source emits second wavelength light; the light source packaging body comprises a third light source and a fourth light source, the third light source emits light with a third wavelength, the fourth light source emits light with a fourth wavelength, the third light source and the fourth light source are both red light, the wavelength peak difference between the third light source and the fourth light source is 10 nanometers to 60 nanometers, the first wavelength light and the second wavelength light are different in color, and the first wavelength light and the second wavelength light are one of green light and blue light. The technical scheme of the utility model can obviously improve the space utilization rate of the lighting system.

Description

Illumination system and projection apparatus

Technical Field

The utility model relates to the technical field of optical display, in particular to an illumination system and projection equipment.

Background

With the rapid development of projection technology, projection apparatuses mainly using solid-state lighting such as light-emitting diodes (LEDs) and laser diodes (laser diodes) are gaining popularity in the market. Most of existing projection light machines are usually provided with an independent illumination system to provide illumination light, and then the illumination light passes through a display chip and is amplified and projected through a lens to form an image. The design of the illumination system is receiving more and more attention because important parameters such as brightness, uniformity, and contrast of the image displayed by the projector are often related to the design of the illumination system.

In a lighting system of a general projector, red, green, blue (RGB) lights are usually set as three primary color light sources of the lighting system, and some lighting systems may set an additional light source as a supplementary light source, so as to improve the lighting brightness. With the improvement of the technology, the illumination light source is rapidly developed, the size of the illumination system in the prior art is generally larger, and the space utilization rate of each element in the illumination system is not good, which may cause the projection device to be too large.

In addition, in order to improve the brightness of the projected picture, it is necessary to increase the amount of light of the corresponding color, i.e., to increase the luminous flux. The current way to increase the luminous flux is to increase the current of the respective power supply, whereby the light sources of the three colors can generate more light. However, the red light source is sensitive to temperature, and when the current is increased to a certain degree, the amount of red light is increased, thereby generating a thermal effect, and causing the luminous efficiency of the red light source to drop suddenly.

Disclosure of Invention

The utility model aims to design a projection light machine illumination system with higher space utilization rate.

To achieve the above object, the present invention provides an illumination system, including:

a first light source emitting light of a first wavelength;

a second light source emitting light of a second wavelength;

the light source package body comprises a third light source and a fourth light source, the third light source emits light with a third wavelength, the fourth light source emits light with a fourth wavelength, the third light source and the fourth light source are both red light, the peak value difference of the third light source and the fourth light source is between 10 nanometers and 60 nanometers, the colors of the first light and the second light are different, and the first light and the second light are one of green light and blue light.

Optionally, the wavelength range of the red light is between 600 nanometers and 740 nanometers.

Optionally, the illumination system further includes a first light splitter disposed at an intersection of the first wavelength light and the second wavelength light, and having a first surface facing the first light source and the second light source and a second surface facing away from the first light source and the second light source.

Optionally, an antireflection film for antireflection of the light with the first wavelength is disposed on the first surface or the second surface, and a reflection film for reflecting the light with the second wavelength is disposed on the first surface or the second surface.

Optionally, the lighting system further includes a second light splitter disposed at an intersection of the light of the first wavelength, the light of the third wavelength, and the light of the fourth wavelength, and the second light splitter has a third surface facing the light source package and a fourth surface facing away from the light source package.

Optionally, an antireflection film that reflects light of the first wavelength and light of the second wavelength is disposed on the third surface or the fourth surface, and a reflection film that reflects light of the third wavelength and light of the fourth wavelength is disposed on the third surface or the fourth surface.

Optionally, the illumination system further comprises an excitation light source, the excitation light source emitting excitation light, and the excitation light is emitted to the first light source.

Optionally, the illumination system further includes a plurality of collimator sets, and the collimator sets are at least disposed in a light exit direction of one of the first light source, the light source package, or the excitation light source.

Optionally, the collimating lens group includes a first collimating lens and a second collimating lens, the first collimating lens is disposed facing the corresponding light source, and the second collimating lens is disposed opposite to the corresponding light source;

the first collimating lens and the second collimating lens are any one of a spherical lens, an aspherical lens or a free-form surface lens.

Optionally, the illumination system further includes a third light splitter and a fourth light splitter, where the third light splitter and the fourth light splitter are disposed on propagation paths of the third wavelength light and the fourth wavelength light, and the third light splitter and the fourth light splitter are not parallel to each other nor intersect with each other.

Optionally, the third light splitter has a fifth surface facing the light source package, the fifth surface is provided with a reflective film reflecting the light of the fourth wavelength, the fourth light splitter has a sixth surface facing the light source package, and the sixth surface is provided with a reflective film reflecting the light of the third wavelength.

Optionally, the illumination system further includes a light exit end surface, and the light exit end surface is perpendicular to the exit direction of the first wavelength light.

Optionally, the first wavelength light is green light, the second wavelength light is blue light, the third wavelength light is red light, and the fourth wavelength light is deep red light.

Furthermore, in order to achieve the above object, the present invention also provides a projection apparatus comprising a housing and an illumination system as described above, the illumination system being provided to the housing.

In the technical scheme provided by the utility model, light with the first wavelength emitted by the first light source and light with the second wavelength emitted by the second light source are converged by the first light splitter. The colors of the first wavelength light and the second wavelength light are different, and the first wavelength light and the second wavelength light are one of green light and blue light. In addition, the third wavelength light emitted by the third light source and the fourth wavelength light emitted by the fourth light source in the light source package are converged with the first wavelength light and the second wavelength light through the second dichroic sheet. The third light source and the fourth light source are both red light, and the wavelength peak difference between the third light source and the fourth light source is between 10 nanometers and 60 nanometers. Therefore, when the brightness of a projection picture is increased, the red color of the projection light source is provided by the two light sources, the problems of thermal effect and sudden drop of luminous efficiency of a single red light source are reduced, and the projection light source can stably work. In addition, the third wavelength light emitted by the third light source and the fourth wavelength light emitted by the fourth light source in the light source packaging body are collimated and emitted in the same beam through the collimating lens group or the two light splitting sheets which are not parallel and crossed, and the volume of the lighting system can be obviously reduced and the space utilization rate is improved by packaging the third light source and the fourth light source together. Furthermore, the excitation light source emits excitation light rays, so that the luminous efficiency of the first light source can be improved, the emergent quantity of the light rays is increased, and the brightness of a projection picture is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a first embodiment of an illumination system according to the present invention;

fig. 2 is a schematic structural diagram of a lighting system according to a second embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	First light source	410	First collimating lens
20	Second light source	420	Second collimating lens
				30	Light source package	510	A first light splitter
310	Third light source	520	The second light splitter
				320	Fourth light source	60	Light emergent end face
40	Collimating lens group

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

In optical projection display, a light combination of three colors of red, green and blue is adopted as a projection light source, and with the improvement of technology, an illumination light source develops rapidly, and the purpose is to provide a projection light machine illumination system with higher space utilization rate.

In order to solve the above problem, referring to fig. 1, the present invention provides an illumination system, comprising: a first light source 10, a second light source 20, and a light source package 30. The light source package 30 includes a third light source 310 and a fourth light source 320. The light emitted by the first light source 10 and the light emitted by the second light source 20 are converged and then converged together with the third light source 310 and the fourth light source 320 to form an emergent display image. The first Light source 10, the second Light source 20, the third Light source 310, and the fourth Light source 320 may be any one of Light-emitting diodes (LEDs), semiconductor Lasers (LDs), and Super Luminescent Diodes (SLDs).

The first light source 10 emits light of a first wavelength, the second light source 20 emits light of a second wavelength, and the light of the first wavelength and the light of the second wavelength are converged. The colors of the first wavelength light and the second wavelength light are different, and the first wavelength light and the second wavelength light are respectively one of green light and blue light; when the first wavelength light is green light, the second wavelength light is blue light, or when the first wavelength light is blue light, the second wavelength light may be green light. The colors of the first wavelength light and the second wavelength light are selected from green light and blue light, and the colors of the two wavelength lights are different. In addition, the green light wavelength range is 490-590 nm, and the blue light wavelength range is 400-460 nm. The third light source 310 emits light of a third wavelength, the fourth light source 320 emits light of a fourth wavelength, and the light of the third wavelength and the light of the fourth wavelength are converged together with the light of the first wavelength and the light of the second wavelength. The third light source and the fourth light source are both red light, and the wavelength peak difference between the third light source and the fourth light source is between 10 nanometers and 60 nanometers. Therefore, when the brightness of a projection picture is increased, the red color of the projection light source is provided by the two light sources, the problems of thermal effect and sudden drop of luminous efficiency of a single red light source are reduced, and the projection light source can stably work. In addition, the wavelength range of the red light is between 600nm and 740 nm.

In the technical solution provided in this embodiment, in the technical solution provided in the present invention, the first wavelength light emitted by the first light source 10 and the second wavelength light emitted by the second light source 20 are converged by the first light splitter 510. The colors of the first wavelength light and the second wavelength light are different, and the first wavelength light and the second wavelength light are one of green light and blue light. In addition, in the light source package 20, the third wavelength light emitted from the third light source 310 and the fourth wavelength light emitted from the fourth light source 320 are converged with the first wavelength light and the second wavelength light by the second dichroic filter 520. The third light source 310 and the fourth light source 320 are both red light, and the wavelength peak difference between the two is between 10 nm and 60 nm. Therefore, when the brightness of a projection picture is increased, the red color of the projection light source is provided by the two light sources, the problems of thermal effect and sudden drop of luminous efficiency of a single red light source are reduced, and the projection light source can stably work.

In the above embodiment, the illumination system further includes the first light splitter 510, and the first light splitter 510 is disposed at an intersection position of the first wavelength light and the second wavelength light, and has a first surface facing the first light source 10 and the second light source 20 and a second surface facing away from the first light source 10 and the second light source 20. The first surface or the second surface is provided with an antireflection film for increasing the reflection of the light with the first wavelength, and the first surface or the second surface is provided with a reflection film for reflecting the light with the second wavelength. For example, the first surface may be provided with an antireflection film for increasing the first wavelength light, the second surface may be provided with a reflection film for reflecting the second wavelength light, the antireflection film for the first wavelength light and the reflection film for the second wavelength light may be both disposed on the first surface, or the antireflection film for the first wavelength light and the reflection film for the second wavelength light may be both disposed on the second surface. The antireflection film for the first wavelength light is close to the first light source 10, and the reflection film for the second wavelength light is close to the second light source 20. The first wavelength light and the second wavelength light are converged by the transmission of the first light splitter 510 and the reflection of the second wavelength light. Wherein, the surface of the first light splitter 510 facing the first light source 10 and the included angle of the light with the first wavelength are between 0 ° and 90 °. For example, the included angle is 45 °, and thus the surface of the first light splitting sheet 510 facing the second light source 20 and the included angle of the light with the second wavelength are also 45 °, so that the light from the first light source 10 and the light from the second light source 20 can be effectively converged.

In the above embodiment, the illumination system further comprises the second dichroic sheet 520. The second dichroic sheet 520 is disposed at an intersection of the first wavelength light, the third wavelength light, and the fourth wavelength light, and the second dichroic sheet 520 has a third surface facing the light source package 30 and a fourth surface facing away from the light source package 30. The third surface or the fourth surface is provided with an antireflection film for increasing the reflection of the light with the first wavelength and the light with the second wavelength, and the third surface or the fourth surface is provided with a reflection film for reflecting the light with the third wavelength and the light with the fourth wavelength. For example, the third surface is provided with an antireflection film for increasing the reflection of light of the first wavelength and the second wavelength, the fourth surface is provided with a reflection film for reflecting light of the third wavelength and the fourth wavelength, the antireflection film for the light of the first wavelength and the light of the second wavelength, the reflection film for the light of the third wavelength and the light of the fourth wavelength may be both disposed on the third surface, and the antireflection film for the light of the first wavelength and the light of the second wavelength, the reflection film for the light of the third wavelength and the light of the fourth wavelength may be both disposed on the fourth surface.

In the above embodiment, the illumination system includes a plurality of collimator lens groups 40, and the collimator lens groups 40 are at least disposed in the light-emitting direction of one of the first light source 10, the second light source 20, or the light source package 30. The collimating lens group 40 is used to convert the passing light rays into a mutually parallel form. The angle of the emergent light of the corresponding light source can be adjusted through the collimation effect of the collimating lens group 40, so that the light can be effectively converged.

Further, the collimating lens group 40 includes a first collimating lens 410 and a second collimating lens 420, the first collimating lens 410 is disposed facing the corresponding light source, and the second collimating lens 420 is disposed facing away from the corresponding light source; the first collimating lens 410 and the second collimating lens 420 are any one of a spherical lens, an aspherical lens, or a free-form surface lens. It should be noted that the number of the collimating lenses in the collimating lens group is not limited to two, and may also be three or more, for example, the collimating lens group 40 may further include three collimating lenses, and similarly, the lenses of the three collimating lenses may also be any one of a spherical lens, an aspheric lens, or a free-form surface lens, and the matching of the plurality of collimating lenses can obtain a better collimating effect. In addition, the surface shape of the collimating lens may be any one of biconvex, planoconvex, biconcave, planoconcave, convexo-concave, and the like, which is not limited herein.

In addition, the third light source 310 and the fourth light source 320 in the light source package 30 are horizontally arranged from left to right, and the third wavelength light emitted by the third light source 310 and the fourth wavelength light emitted by the fourth light source 320 are collimated and emitted in the same beam through the collimating lens group 40 or two mutually non-parallel and non-crossed light splitting sheets. The light source package in the lighting system of the present embodiment has two structures. One structure is as follows: the light source package 30 includes a third light source 310 and a fourth light source 320, and the third wavelength light emitted from the third light source 310 and the fourth wavelength light emitted from the fourth light source 320 are collimated and emitted in the same beam by the collimating lens group 40. It should be noted that the collimating lens group 40 includes, but is not limited to, the first collimating lens 410 and the second collimating lens 420, and may be three collimating lenses or a plurality of collimating lenses by optical design optimization, wherein the collimating lenses may also be any one of spherical lenses, aspheric lenses, or free-form surface lenses, and the surface type of the collimating lenses may be any one of biconvex, planoconvex, biconcave, planoconcave, convex-concave, and the like, which is not limited herein. It should be noted that the collimator set 40 in the light source package 30 and the collimator set 40 in the other light sources are not necessarily identical. The other structure is as follows: the light source package 30 includes a third light source 310 and a fourth light source 320, the third wavelength light emitted from the third light source 310 and the fourth wavelength light emitted from the fourth light source 320 are collimated and emitted in the same beam through the collimating lens group 40 and two third light splitters and fourth light splitters which are not parallel to each other and do not cross each other, wherein the third light splitters and the fourth light splitters are disposed on the propagation paths of the third wavelength light and the fourth wavelength light, the third light splitters and the fourth light splitters are not parallel to each other and do not cross each other, the third light splitters have a fifth surface facing the light source package 30, the fifth surface is provided with a reflective film for reflecting the fourth wavelength light, the fourth light splitters have a sixth surface facing the light source package 30, the sixth surface is provided with a reflective film for reflecting the third wavelength light, and by the reflection of the third light splitters on the fourth wavelength light and the reflection of the fourth light splitters on the third wavelength light, so that the second wavelength light and the third wavelength light realize collimation and same beam emergence. It should be noted that the collimator lens group 40 may be two collimator lenses or a plurality of collimator lenses through optical design optimization, wherein the collimator lens may also be any one of a spherical lens, an aspheric lens, or a free-form surface lens, and the surface type of the collimator lens may be any one of a biconvex lens, a plano-convex lens, a biconcave lens, a plano-concave lens, a convex-concave lens, and the like, which is not limited herein.

In the above embodiment, the illumination system further includes the light-exiting end face 60, and the light-exiting end face 60 is perpendicular to the exiting direction of the first wavelength light. Taking the lighting system provided in fig. 1 as an example, it should be noted that this is only described as an example. The first light source 10 emits green light, and the second light source 20 emits blue light, wherein the green light emitted from the first light source 10 is transmitted through the first light splitter 510, the blue light emitted from the second light source 20 is reflected by the first light splitter 510, and the green light emitted from the first light source 10 and the blue light emitted from the second light source 20 are converged; the third light source 310 emits red light, and the fourth light source 320 emits deep red light, wherein the red light emitted by the third light source 310 and the deep red light emitted by the fourth light source 320 are reflected by the second light splitter 520, and are converged together with the green light emitted by the first light source 10 and the blue light emitted by the second light source 20, and are emitted from the light-emitting end face 60 together.

Referring to fig. 2, the illumination system according to the second embodiment of the present invention further includes an excitation light source 70, and the excitation light source 70 emits excitation light toward the first light source 10. It should be noted that the collimating lens group 40 can be disposed in the light-emitting direction of the excitation light source 70, and the structure in the first embodiment can be applied to this example, and is not limited thereto. The excitation light source 70 emits excitation light toward the first light source 10, thereby exciting the fluorescent substance of the corresponding light source, and thus improving the light emitting efficiency of the corresponding light source. The excitation light source 70 is one of red light, green light and blue light, so that the excitation light emitted from the excitation light source can improve the light emitting efficiency of the first light source, thereby increasing the quantity of emitted light and further improving the brightness of the projection image.

In particular, taking the lighting system provided in fig. 2 as an example, it is noted that this is only illustrated as an example. The first light source 10 emits green light, the second light source 20 emits blue light, and the excitation light source 70 emits blue light, wherein the blue light emitted by the excitation light source 70 is reflected by the first light splitter 510 and emitted to the first light source 10, so as to excite an excited substance on one side of a light emitting chip in the first light source 10, the green light emitted by the first light source 10 is transmitted by the first light splitter 510, the blue light emitted by the second light source 20 is reflected by the first light splitter 510, and the green light emitted by the first light source 10 and the blue light emitted by the second light source 20 are converged; the third light source 310 emits red light, and the fourth light source 320 emits deep red light, wherein the red light emitted by the third light source 310 and the deep red light emitted by the fourth light source 320 are reflected by the second light splitter 520, and are converged together with the green light emitted by the first light source 10 and the blue light emitted by the second light source 20, and are emitted from the light-emitting end face 60 together.

In the illumination system provided by the present invention, light of the first wavelength emitted by the first light source 10 and light of the second wavelength emitted by the second light source 20 are converged by the first light splitter 510. The colors of the first wavelength light and the second wavelength light are different, and the first wavelength light and the second wavelength light are one of green light and blue light. In addition, the light of the third wavelength emitted from the third light source 310 and the light of the fourth wavelength emitted from the fourth light source 320 in the light source package 30 are converged with the light of the first wavelength and the light of the second wavelength by the second dichroic sheet 520. The third light source 310 and the fourth light source 320 are both red light, and the wavelength peak difference between the two is between 10 nm and 60 nm. Therefore, when the brightness of a projection picture is increased, the red of the projection light source is provided by the two light sources, the problems of thermal effect and sudden drop of luminous efficiency of a single red light source are solved, and the projection light source can stably work. In addition, the third light source 310 and the fourth light source 320 in the light source package 30 are horizontally arranged from left to right, and the third wavelength light emitted from the third light source 310 and the fourth wavelength light emitted from the fourth light source 320 are collimated and emitted in the same beam by the collimator set 40 or two light-splitting sheets which are not parallel to each other and do not intersect with each other. Further, the excitation light source 70 emits excitation light to improve the light emitting efficiency of the first light source, so as to improve the quantity of emitted light, and further improve the brightness of the projection image.

The utility model also provides a projection device which comprises a shell and the illumination system, wherein the illumination system is arranged on the shell. The shell is provided with an installation space, the lighting system is arranged in the installation space, and the shell can protect the lighting system and reduce the probability that optical components in the lighting system are damaged. Meanwhile, the shell can prevent dust from falling into the lighting system, so that the influence of the dust on the lighting system is reduced. In addition, the shell can also prevent water, reduce rainwater or sweat and other liquid infiltration to the lighting system in, avoid liquid to cause the corruption to the optical components in the lighting system.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or which are directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (14)

1. An illumination system, characterized in that the illumination system comprises:

a first light source emitting light of a first wavelength;

a second light source emitting light of a second wavelength;

the light source package body comprises a third light source and a fourth light source, the third light source emits light with a third wavelength, the fourth light source emits light with a fourth wavelength, the third light source and the fourth light source are both red light, the wavelength peak difference between the third light source and the fourth light source is between 10 nanometers and 60 nanometers, the colors of the first wavelength light and the second wavelength light are different, and the first wavelength light and the second wavelength light are one of green light and blue light.

2. The illumination system of claim 1, wherein the red light has a wavelength in a range between 600 nanometers and 740 nanometers.

3. The illumination system of claim 1, further comprising a first light splitter disposed at an intersection of the first wavelength light and the second wavelength light and having a first surface facing the first light source and the second light source and a second surface facing away from the first light source and the second light source.

4. The illumination system of claim 3, wherein the first surface or the second surface is provided with an antireflection film that reflects light of the first wavelength, and wherein the first surface or the second surface is provided with a reflection film that reflects light of the second wavelength.

5. The illumination system of claim 3, further comprising a second dichroic sheet disposed at an intersection of the light of the first wavelength, the light of the third wavelength, and the light of the fourth wavelength, the second dichroic sheet having a third surface facing the light source package and a fourth surface facing away from the light source package.

6. The illumination system of claim 5, wherein the third surface or the fourth surface is provided with an antireflection film that reflects the light of the first wavelength and the light of the second wavelength, and wherein the third surface or the fourth surface is provided with a reflection film that reflects the light of the third wavelength and the light of the fourth wavelength.

7. The illumination system of claim 1, further comprising an excitation light source that emits excitation light rays that are directed to the first light source.

8. The illumination system of claim 7, further comprising a plurality of collimating lens sets disposed in a light-emitting direction of at least one of the first light source, the light source package, or the excitation light source.

9. The illumination system of claim 8, wherein the set of collimating lenses comprises a first collimating lens disposed facing the respective light source and a second collimating lens disposed facing away from the respective light source;

the first collimating lens and the second collimating lens are any one of a spherical lens, an aspheric lens or a free-form surface lens.

10. The illumination system of claim 1, further comprising a third light splitter and a fourth light splitter, wherein the third light splitter and the fourth light splitter are disposed in a propagation path of the light of the third wavelength and the light of the fourth wavelength, and wherein the third light splitter and the fourth light splitter are not parallel to each other and do not intersect each other.

11. The illumination system of claim 10, wherein the third light splitter has a fifth surface facing the light source package, the fifth surface being provided with a reflective film that reflects light of the fourth wavelength, the fourth light splitter having a sixth surface facing the light source package, the sixth surface being provided with a reflective film that reflects light of the third wavelength.

12. The illumination system according to any one of claims 1 to 11, wherein the illumination system further comprises an exit end face perpendicular to an exit direction of the light of the first wavelength.

13. The illumination system of any of claims 1 to 11, wherein the first wavelength light is green light, the second wavelength light is blue light, the third wavelength light is red light, and the fourth wavelength light is deep red light.

14. A projection device, characterized in that the projection device comprises a housing and an illumination system as claimed in any one of claims 1 to 13, which illumination system is provided at the housing.

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