CN216979564U

CN216979564U - Illumination system and projection apparatus

Info

Publication number: CN216979564U
Application number: CN202123246268.8U
Authority: CN
Inventors: 郭飞
Original assignee: Goertek Optical Technology Co Ltd
Current assignee: Goertek Optical Technology Co Ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-07-15
Anticipated expiration: 2031-12-22

Abstract

The utility model discloses an illumination system and projection equipment, wherein the illumination system comprises a first light source, a second light source and a projection unit, wherein the first light source emits first-wavelength light; the combined light source comprises a second light source and a third light source, wherein the second light source emits second-wavelength light, the third light source emits third-wavelength light, the colors of the first-wavelength light, the second-wavelength light and the third-wavelength light are different, and the first-wavelength light, the second-wavelength light and the third-wavelength light are respectively one of red light, green light and blue light; the fourth light source emits light with a fourth wavelength, the third light source and the fourth light source are red light sources with the wavelength of 600 nm to 740 nm, and the wavelength peak difference between the third light source and the fourth light source is between 10 nm and 60 nm; and the excitation light source emits excitation light rays, and the excitation light rays irradiate to the first light source. The technical scheme of the utility model can obviously reduce the volume 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 the 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 then is amplified and projected through a lens to form an image. The brightness, uniformity, contrast and other important parameters of the image displayed by the projector are often closely related to the design of the illumination system, so the design of the illumination system is receiving more and more attention from the industry.

In a general illumination system of a projector, red, green, blue (RGB) light is usually provided as a three-primary-color light source of the illumination system, and some illumination systems may provide an additional light source as a supplementary light source, so as to improve illumination brightness. With the improvement of the technology, the illumination light source develops rapidly, and the existing illumination system generally has the defect of large volume.

In addition, in order to increase the brightness of the projected picture, it is necessary to increase the number of light rays of the corresponding color, i.e., to increase the light 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 small volume.

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

a first light source emitting light of a first wavelength;

the combined light source comprises a second light source and a third light source, wherein the second light source emits light with a second wavelength, and the third light source emits light with a third wavelength, wherein the colors of the light with the first wavelength, the light with the second wavelength and the light with the third wavelength are different, and the light with the first wavelength, the light with the second wavelength and the light with the third wavelength are respectively one of red light, green light and blue light;

a fourth light source, wherein the fourth light source emits light of a fourth wavelength, the third light source and the fourth light source are red light sources with a wavelength of 600 nm to 740 nm, and the wavelength peak difference between the third light source and the fourth light source is between 10 nm and 60 nm; and

the excitation light source emits excitation light rays, and the excitation light rays irradiate to the first light source.

Optionally, the second light source is a second light emitting chip, the third light source is a third light emitting chip, and the second light emitting chip and the third light emitting chip are of a package integrated structure.

Optionally, the illumination system comprises a first light splitter for reflecting the excitation light rays to the first light source.

Optionally, the illumination system comprises a second dichroic sheet for reflecting the fourth wavelength light.

Optionally, the first wavelength light is transmitted to the second dichroic sheet through the first dichroic sheet, and is emitted after being transmitted through the second dichroic sheet; the second wavelength light and the third wavelength light are reflected to the second light splitting plate through the first light splitting plate and then emitted after being transmitted through the second light splitting plate.

Optionally, the first wavelength light is emitted after being transmitted by the first light splitter; the second wavelength light and the third wavelength light are transmitted to the second light splitter through the first light splitter and then emitted after being reflected by the second light splitter.

Optionally, the first wavelength light is transmitted to the first light splitter through the second light splitter, and is emitted after being transmitted through the first light splitter; the second wavelength light and the third wavelength light are emitted after being reflected by the first light splitter.

Optionally, the illumination system comprises a third light splitter for transmitting the excitation light rays; the first light splitter and the second light splitter are arranged in an intersecting manner; the first wavelength light is transmitted by the first light splitter and then emitted; the second wavelength light and the third wavelength light are emitted after being reflected by the first light splitter; the excitation light is transmitted to the first light splitter through the third light splitter and then is reflected by the first light splitter and then is emitted; and the fourth wavelength light is reflected to the second light splitting sheet by the third light splitting sheet and then emitted after being reflected by the second light splitting sheet.

Optionally, the illumination system includes a plurality of collimator sets, and the collimator sets are at least disposed in the light exit direction of one of the first light source, the combined light source, 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 lighting system further includes a fourth light splitter and a fifth light splitter, the fourth light splitter and the fifth light splitter are disposed on the propagation paths of the second wavelength light and the third wavelength light, and the fourth light splitter and the fifth light splitter are not parallel to each other nor intersect with each other.

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 a first wavelength emitted by a first light source, light with a second wavelength emitted by a second light source in a combined light source and light with a third wavelength emitted by a third light source are converged by a first light splitter. The first wavelength light, the second wavelength light and the third wavelength light are respectively one of red light, green light and blue light. And the fourth wavelength light emitted by the fourth light source is converged with the first wavelength light, the second wavelength light and the third wavelength light together to provide a light source for the projection picture. The third light source and the fourth light source are red light sources with the wavelength of 600 nanometers to 740 nanometers, and the wavelength peak difference between the third light source and the fourth light source is between 10 nanometers and 60 nanometers, so that 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 heat effect and sudden drop of luminous efficiency of a single red light source are reduced, and the projection light source can work stably. In addition, in the combined light source, the second wavelength light emitted by the second light source and the third wavelength light emitted by the third light source are collimated and emitted in the same beam through the collimating lens group or the two light splitting sheets which are not parallel to each other and also do not cross each other, the second light source is a second light emitting chip, the third light source is a third light emitting chip, and the second light emitting chip and the third light emitting chip are of a packaging integrated structure. 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 second embodiment of the illumination system of the present invention;

FIG. 3 is a schematic structural diagram of a third embodiment of the illumination system of the present invention;

FIG. 4 is a schematic structural diagram of a fourth embodiment of the illumination system of the present invention;

FIG. 5 is a schematic view of an embodiment of a combined light source in the illumination system of the present invention;

fig. 6 is another schematic structure diagram of the combined light source in the illumination system of the utility model.

The reference numbers illustrate:

reference numerals	Name(s)	Reference numerals	Name (R)
				10	First light source	520	Second collimating lens
20	Combined light source	610	A first light splitter
				210	Second light source	620	The second light splitter
220	Third light source	630	The third light splitter
				30	Excitation light source	640	The fourth light splitter
40	Fourth light source	650	Fifth light splitter
				50	Collimating lens group	70	Light emergent end face
510	First collimating lens

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 obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It should be noted that all directional indicators (such as upper, lower, 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 the technology, an illumination light source develops rapidly, and the purpose is to provide a projection light machine illumination system with a smaller volume.

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 combined light source 20, a fourth light source 30, and an excitation light source 40. Wherein the combined light source 20 comprises a second light source 210 and a third light source 220. The light emitted by the first light source 10, the second light source 210 and the third light source 220 is converged and then converged together with the light emitted by the fourth light source 30 to form an emergent display image. The first Light source 10, the second Light source 210, the third Light source 220, and the fourth Light source 30 may be any one of Light-emitting diodes (LEDs), semiconductor Lasers (LDs), and Super Luminescent Diodes (SLDs). The second light source is a second light emitting chip, the third light source is a third light emitting chip, and the second light emitting chip and the third light emitting chip are of an integrated packaging structure, so that the size of the lighting system can be remarkably reduced.

The first light source 10 emits light of a first wavelength, the second light source 210 emits light of a second wavelength, the third light source 220 emits light of a third wavelength, and the light of the first wavelength, the light of the second wavelength, and the light of the third wavelength are converged. The colors of the first wavelength light, the second wavelength light and the third wavelength light are different, and the first wavelength light, the second wavelength light and the third wavelength light are respectively one of red light, green light and blue light. The fourth light source 30 emits light of a fourth wavelength, and the light of the fourth wavelength is converged together with the light of the first wavelength, the light of the second wavelength, and the light of the third wavelength. The third light source 220 and the fourth light source 30 are red light sources with a wavelength of 600 nm to 740 nm, and the peak difference between the wavelengths 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 green light wavelength range is 490-590 nm, and the blue light wavelength range is 400-460 nm.

In the technical solution provided in this embodiment, the first wavelength light emitted by the first light source 10, the second wavelength light emitted by the second light source 210, and the third wavelength light emitted by the third light source 220 are converged by the first light splitter 610. The first wavelength light, the second wavelength light and the third wavelength light are respectively one of red light, green light and blue light. In order to further improve the light extraction efficiency of the illumination system, the illumination system includes an excitation light source 40, and the excitation light source 40 emits excitation light, which is emitted toward the first light source 10, so as to excite the fluorescent substance of the corresponding light source, thereby improving the light extraction efficiency of the corresponding light source. The excitation light source 40 is one of red light, green light and blue light, so that the excitation light source emits excitation light to improve the light emitting efficiency of the first light source, thereby improving the emergent quantity of the light and further improving the brightness of the projection picture.

In the above embodiment, the illumination system includes a plurality of collimator lens sets 50, and the collimator lens sets 50 are at least disposed in the light emitting direction of one of the first light source 10, the combined light source 20, the fourth light source 30, and the excitation light source 40. The collimating lens group 50 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 by the collimation effect of the collimating lens group 50, so that the light can be effectively converged.

Further, the collimating lens group 50 includes a first collimating lens 510 and a second collimating lens 520, the first collimating lens 510 is disposed facing the corresponding light source, and the second collimating lens 520 is disposed facing away from the corresponding light source; the first collimating lens 510 and the second collimating lens 520 are any one of a spherical lens, an aspherical lens, or a free-form 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 50 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 type of the collimating lens may be any one of biconvex, plano-convex, biconcave, plano-concave, convex-concave, and the like, and is not limited herein.

In the above embodiment, the illumination system includes the first light splitter 610, the first light splitter 610 is configured to reflect the excitation light to the first light source 10, the first light splitter 610 is disposed at an intersection of the first wavelength light and the excitation light, and has a first surface facing the first light source and a second surface facing away from the first light source, the combined light source 20 is disposed on one side of the second surface of the first light splitter, the first surface or the second surface is provided with an antireflection film that reflects light of the first wavelength, and the first surface or the second surface is provided with a reflection film that reflects light of the second wavelength and light of the third wavelength. For example, the first surface may be provided with an antireflection film that reflects light of a first wavelength, the second surface may be provided with a reflection film that reflects light of a second wavelength and light of a third wavelength, the antireflection film of the light of the first wavelength, the reflection film of the light of the second wavelength, and the reflection film of the light of the third wavelength may be both disposed on the first surface, or the antireflection film of the light of the first wavelength, the reflection film of the light of the second wavelength, and the reflection film of the light of the third wavelength 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 and the third wavelength light is close to the combined light source 20. The first wavelength light, the second wavelength light and the third wavelength light are converged by the transmission of the first wavelength light and the reflection of the second wavelength light and the third wavelength light by the first light splitter 610. Wherein, the surface of the first light splitter 610 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 angle is 45 °, and thus the angle between the surface of the first light splitter 510 facing the combined light source 20 and the light of the second wavelength is also 45 °, so that the light from the first light source 10 and the light from the combined light source 20 can be effectively converged.

In the above embodiment, the illumination system further comprises the second dichroic sheet 620. The second light splitter 620 is configured to reflect light of a fourth wavelength, the second light splitter 620 is disposed at a crossing position of the light of the first wavelength and the light of the fourth wavelength, the second light splitter 520 has a third surface facing the first light source 10 and a fourth surface facing away from the first light source 10, the third surface or the fourth surface is provided with an antireflection film that reflects light of the first wavelength, light of the second wavelength, and light of the third wavelength, and the third surface or the fourth surface is provided with a reflection film that reflects light of the fourth wavelength. For example, an antireflection film for antireflection of the first wavelength light, the second wavelength light, and the third wavelength light is disposed on the third surface, a reflection film for reflection of the fourth wavelength light is disposed on the fourth surface, the antireflection film for the first wavelength light, the second wavelength light, and the third wavelength light and the reflection film for the fourth wavelength light may be disposed on the third surface, and the antireflection film for the first wavelength light, the second wavelength light, and the third wavelength light and the reflection film for the fourth wavelength light may be disposed on the fourth surface. Wherein, the included angle between the surface of the second light splitter 620 facing the first light source 10 and the fourth wavelength light is between 0 ° and 90 °. For example, the included angle may be 45 °, so that the light from the first light source 10, the combined light source 20, and the light from the fourth light source 30 can be effectively converged. Specifically, the light with the first wavelength is transmitted to the second dichroic sheet 620 through the first dichroic sheet 610, and is transmitted through the second dichroic sheet 620 and then emitted; the second wavelength light and the third wavelength light are reflected to the second dichroic sheet 620 through the first dichroic sheet 610, and then transmitted through the second dichroic sheet 620 to be emitted.

In addition, the second light source 210 and the third light source 220 in the combined light source 20 are horizontally arranged from left to right, the second light source 210 is a second light emitting chip, the third light source 220 is a third light emitting chip, and the second light emitting chip and the third light emitting chip are of an integrated packaging structure. The second wavelength light emitted from the second light source 210 and the third wavelength light emitted from the third light source 22 are collimated and emitted in the same beam by the collimator set 50 or two non-parallel non-intersecting light-splitting sheets. By this arrangement, the volume of the illumination system can be significantly reduced. Referring to fig. 5 and 6, two schematic structural diagrams of the combined light source in the illumination system of the embodiment are shown. Fig. 5 is a schematic structural diagram of a combined light source in an illumination system, where the combined light source 20 includes a second light source 210 and a third light source 220, and the second wavelength light emitted by the second light source 210 and the third wavelength light emitted by the third light source 22 are collimated and emitted in the same beam by the collimator lens group 50. It should be noted that the collimating lens group 50 includes, but not limited to, the first collimating lens 510 and the second collimating lens 520, and may be three collimating lenses or a plurality of collimating lenses by optimization of optical design, 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, plano-convex, biconcave, plano-concave, convex-concave, and the like, which is not limited herein. It should be noted that the set of collimating lenses 50 in the combined light source 20 and the set of collimating lenses 50 in the other light sources are not necessarily identical. Fig. 6 is another schematic structural diagram of a combined light source in an illumination system, in which the combined light source 20 includes a second light source 210 and a third light source 220, the second light source 210 is a second light emitting chip, the third light source 220 is a third light emitting chip, and the second light emitting chip and the third light emitting chip are in an integrated package structure. The second wavelength light emitted by the second light source 210 and the third wavelength light emitted by the third light source 22 are collimated and emitted in the same beam through the collimating lens group 50 and the two mutually unparallel and uncrossed fourth light splitting plates 640 and fifth light splitting plates 650, wherein the fourth light splitting plates 640 and the fifth light splitting plates 650 are arranged on the propagation paths of the second wavelength light and the third wavelength light, the fourth light splitting plates 640 and the fifth light splitting plates 650 are mutually unparallel and uncrossed, the fourth light splitting plates 640 have seventh surfaces facing the combined light source 20, the seventh surfaces are provided with an anti-reflection film for anti-reflecting the second wavelength light and a reflection film for reflecting the third wavelength light, the fifth light splitting plates 650 have eighth surfaces facing the combined light source 20, the eighth surfaces are provided with an anti-reflection film for anti-reflection the third wavelength light and a reflection film for reflecting the second wavelength light, the third wavelength light is reflected by the fourth light splitting plates 640 and the second wavelength light is reflected by the fifth light splitting plates 650, so that the second wavelength light and the third wavelength light realize collimation and same beam emergence. It should be noted that the collimating lens group 50 may be two collimating lenses or a plurality of collimating lenses through optical design optimization, wherein the collimating lens may also be any one of a spherical lens, an aspheric lens, or a free-form lens, and the surface type of the collimating 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 70, and the light-exiting end face 70 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, the second light source 210 emits blue light, the third light source 220 emits red light, the fourth light source 30 emits deep red light, and the excitation light source 40 emits blue light, wherein the green light emitted by the first light source 10 is transmitted through the first light splitter 610, the blue light emitted by the second light source 210 and the red light emitted by the third light source 220 are reflected by the first light splitter 610, the excitation light emitted by the excitation light source 40 is reflected by the first light splitter 610 and emitted to the first light source 10, and further excited emission substances on one side of the light emitting chip in the first light source 10 are excited, the green light is emitted after excitation, the green light is converged with the green light emitted by the first light source 10, the blue light emitted by the second light source 210 and the red light emitted by the third light source 220 and emitted to the second light splitter 620, the green light emitted by the first light source 10, the blue light emitted by the second light source 210 and the red light emitted by the third light source 220 are converged with the light emitted by the fourth light source 30 and reflected by the second light splitter 620, and are collectively emitted from the light-emitting end face 70.

Referring to fig. 2, the present invention further provides a second embodiment, in which the illumination system includes a first light source 10, a combined light source 20, a fourth light source 30 and an excitation light source 40. Wherein the combined light source 20 comprises a second light source 210 and a third light source 220. The light emitted by the first light source 10, the second light source 210 and the third light source 220 is converged and then converged together with the light emitted by the fourth light source 30 to form an emergent display image.

In this embodiment, the illumination system further includes a first light splitter 610, the first light splitter 610 is configured to reflect the excitation light to the first light source 10, the first light splitter 610 is disposed at a crossing position of the first wavelength light and the excitation light, and has a first surface facing the first light source and a second surface facing away from the first light source, an antireflection film that reflects light of the first wavelength is disposed on the first surface or the second surface, and a reflective film that reflects light of the second wavelength, light of the third wavelength, and light of the fourth wavelength is disposed on the first surface or the second surface.

In this embodiment, the illumination system further comprises a second dichroic sheet 620. The second dichroic sheet 620 is configured to reflect light of a fourth wavelength, the second dichroic sheet 620 is disposed at a crossing position of the light of the second wavelength, the light of the third wavelength, and the light of the fourth wavelength, the second dichroic sheet 620 has a third surface facing the first combined light source 20 and a fourth surface facing away from the first combined light source 20, an antireflection film for antireflection of the light of the second wavelength and the light of the third wavelength is disposed on the third surface or the fourth surface, and a reflective film for reflecting the light of the fourth wavelength is disposed on the third surface or the fourth surface. Specifically, the first wavelength light is transmitted through the first light splitter 610 and then emitted; the second wavelength light and the third wavelength light are transmitted to the second light splitter 620 through the first light splitter 610, and then reflected by the second light splitter 620 to be emitted.

In this embodiment, the illumination system further includes a light-exiting end face 70, and the light-exiting end face 70 is perpendicular to the exiting direction of the first wavelength light. Taking the lighting system provided in fig. 2 as an example, it is noted that this is only described as an example. The first light source 10 emits green light, the excitation light source 40 emits blue light, the blue light is reflected by the first light splitter 610 and then emitted to the first light source 10, an excited substance on one side of a light emitting chip in the first light source 10 is excited, and the green light is emitted after the excited substance is excited; the second light source 210 emits blue light, the third light source 220 emits red light, and the fourth light source 30 emits deep red light, wherein the blue light emitted by the second light source 210 and the red light emitted by the third light source 220 are converged by the light transmitted by the second dichroic sheet 620 and the light reflected by the second dichroic sheet 620 and the deep red light emitted by the fourth light source 30, and are converged together with the green light emitted by the first light source 10 after being reflected by the first dichroic sheet 610, and are emitted from the light-emitting end face 70 together.

Referring to fig. 3, the illumination system according to the third embodiment of the present invention includes a first light source 10, a combined light source 20, a fourth light source 30, and an excitation light source 40. Wherein the combined light source 20 comprises a second light source 210 and a third light source 220. The light emitted by the first light source 10, the second light source 210 and the third light source 220 is converged and then converged together with the light emitted by the fourth light source 30 to form an emergent display image.

In this embodiment, the illumination system further includes a first light splitter 610. The first light splitter 610 is configured to reflect the excitation light to the first light source 10, the first light splitter 610 is disposed at a crossing position of the first wavelength light and the excitation light, the first light splitter 610 has a third surface facing the combined light source 20 and a fourth surface facing away from the combined light source 20, an antireflection film for reflecting the first wavelength light and the fourth wavelength light is disposed on the third surface or the fourth surface, and a reflection film for reflecting the second wavelength light and the third wavelength light is disposed on the third surface or the fourth surface.

In this embodiment, the lighting system further includes a second light splitter 620, the second light splitter 620 is configured to reflect light with a fourth wavelength, the second light splitter 620 is disposed at a crossing position of the light with the first wavelength and the light with the fourth wavelength, and has a first surface facing the first light source and a second surface facing away from the first light source, an anti-reflection film for anti-reflecting the light with the first wavelength and the light with the second wavelength is disposed on the first surface or the second surface, and a reflection film for reflecting the light with the fourth wavelength is disposed on the first surface or the second surface. Specifically, the first wavelength light is transmitted to the first light splitter 610 through the second light splitter 620, and is emitted after being transmitted through the first light splitter 610; the second wavelength light and the third wavelength light are reflected by the first light splitter 610 and then emitted.

In this embodiment, the illumination system further includes a light-exiting end face 70, and the light-exiting end face 70 is perpendicular to the exiting direction of the first wavelength light. Taking the lighting system provided in fig. 3 as an example, it is noted that this is only described as an example. The first light source 10 emits green light, the fourth light source 30 emits deep red light, the excitation light source 40 emits blue light, the blue light is reflected by the first light splitter 610 and then emitted to the second light splitter 620, the blue light is transmitted by the second light splitter 620 and then emitted to the first light source 10, an excited substance on one side of a light emitting chip in the first light source 10 is excited and then emitted to green light, the light transmitted by the second light splitter 620 and the light reflected by the second light splitter 620 and emitted by the fourth light source are converged, the light is emitted to the first light splitter 610, the blue light is emitted by the second light source 210, the red light is emitted by the third light source 220, the blue light emitted by the second light source 210 and the red light emitted by the third light source 220 are converged together with the green light and the deep red light transmitted by the second light splitter after being reflected by the first light splitter 610 and then emitted from the light emitting end face 70.

Referring to fig. 4, in a fourth embodiment of the present invention, an illumination system includes a first light source 10, a combined light source 20, a fourth light source 30, and an excitation light source 40. Wherein the combined light source 20 comprises a second light source 210 and a third light source 220. The light emitted by the first light source 10, the second light source 210 and the third light source 220 is converged and then converged together with the light emitted by the fourth light source 30 to form an emergent display image.

In this embodiment, the illumination system further includes a first light splitter 610, the first light splitter 610 is configured to reflect the excitation light to the first light source 10, the first light splitter 610 is disposed at an intersection of the first wavelength light and the excitation light, and has a first surface facing the first light source and a second surface facing away from the first light source, an antireflection film that reflects light of the first wavelength and light of the fourth wavelength is disposed on the first surface or the second surface, and a reflection film that reflects light of the second wavelength and light of the third wavelength is disposed on the first surface or the second surface.

In this embodiment, the illumination system further comprises a second dichroic sheet 620. The second light splitter 620 is configured to reflect light of a fourth wavelength, the second light splitter 620 is disposed at a crossing position of the first wavelength light and the excitation light and is crossed with the first light splitter 610, the second light splitter 620 has a third surface facing the combined light source 20 and a fourth surface facing away from the combined light source 20, an antireflection film for antireflection of the first wavelength light, the second wavelength light and the third wavelength light is disposed on the third surface or the fourth surface, and a reflective film for reflecting the light of the fourth wavelength is disposed on the third surface or the fourth surface.

In this embodiment, the illumination system further comprises a third light splitter 630. The third light splitter 630 is configured to transmit excitation light, the third light splitter 630 is disposed at a crossing position of the fourth wavelength light and the excitation light, and has a fifth surface facing the excitation light source and a sixth surface facing away from the excitation light source, the fifth surface or the sixth surface is provided with an antireflection film for antireflection of the second wavelength light, and the fifth surface or the sixth surface is provided with a reflection film for reflecting the fourth wavelength light. For example, an antireflection film for increasing the second wavelength light is disposed on the fifth surface, a reflective film for reflecting the fourth wavelength light is disposed on the sixth surface, both the antireflection film for the second wavelength light and the reflective film for the fourth wavelength light may be disposed on the third surface, and both the antireflection film for the second wavelength light and the reflective film for the fourth wavelength light may be disposed on the fourth surface. Wherein, the surface of the third light splitter 630 facing the fourth light source 30 and the included angle of the fourth wavelength light are between 0 ° and 90 °. For example, the included angle may be 45 °. Specifically, the first light splitter 610 and the second light splitter 620 are disposed to intersect; the first wavelength light is transmitted by the first light splitter 610 and then emitted; the second wavelength light and the third wavelength light are reflected by the first light splitter 610 and then emitted; the excitation light is transmitted to the first light splitter 610 through the third light splitter 630, and then is reflected by the first light splitter 610 and emitted; the light with the fourth wavelength is reflected to the second dichroic sheet 620 through the third dichroic sheet 630, and is emitted after being reflected by the second dichroic sheet 620.

In this embodiment, the illumination system further includes a light-exiting end face 70, and the light-exiting end face 70 is perpendicular to the exiting direction of the first wavelength light. Taking the lighting system provided in fig. 4 as an example, it should be noted that the description is only given as an example. The first light source 10 emits green light, the second light source 210 emits blue light, the third light source 220 emits red light, the fourth light source 30 emits deep red light, and the excitation light source 40 emits blue light. The blue light emitted by the excitation light source 40 is reflected by the third light splitter 630 and then emitted to the first light splitter 610, the blue light transmitted by the first light splitter 610 is emitted to the first light source 10, so as to excite the fluorescent substance of the first light source 10 and emit green light after excitation, the blue light emitted by the second light source 210 and the red light emitted by the third light source 220 are reflected by the first light splitter 610 and then converged with the green light emitted by the first light source 10, the deep red light emitted by the fourth light source 30 is transmitted by the third light splitter 630 and then emitted to the second light splitter 620, and the deep red light reflected by the second light splitter 620 and converged with the green light emitted by the first light source 10, the blue light emitted by the second light source 210 and the red light emitted by the third light source 220 and then emitted from the light-emitting end face 70.

In the illumination system, light of a first wavelength emitted by the first light source 10, light of a second wavelength emitted by the second light source 210 in the combined light source 20, and light of a third wavelength emitted by the third light source 220 are converged by the first light splitter 610. The first wavelength light, the second wavelength light and the third wavelength light are respectively one of red light, green light and blue light. The fourth light source 40 emits a fourth wavelength light, and the fourth wavelength light is converged together with the first wavelength light, the second wavelength light and the third wavelength light to provide a light source for projecting a picture. The third light source 220 and the fourth light source 40 are red light sources with a wavelength of 600 nm to 740 nm, and the peak difference between the wavelengths is 10 nm to 60nm, so that when the brightness of the 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, in the combined light source 20, the second wavelength light emitted by the second light source 210 and the third wavelength light emitted by the third light source 220 are collimated and emitted in the same beam through the collimating lens group or two light splitting sheets which are not parallel to each other and also do not cross each other, the second light source 210 is a second light emitting chip, the third light source 220 is a third light emitting chip, and the second light emitting chip and the third light emitting chip are of a package integrated structure. Further, the excitation light source 30 emits excitation light to improve the light emitting efficiency of the first light source, so as to improve the outgoing amount of the light, thereby improving 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 not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

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

a first light source emitting light of a first wavelength;

2. The illumination system of claim 1, wherein the second light source is a second light emitting chip, the third light source is a third light emitting chip, and the second light emitting chip and the third light emitting chip are of a package-in-one structure.

3. The illumination system of claim 1, wherein the illumination system comprises a first light splitter for reflecting the exciting light rays to the first light source.

4. The illumination system of claim 3, wherein the illumination system comprises a second dichroic sheet configured to reflect the fourth wavelength light.

5. The illumination system of claim 4, wherein the first wavelength light is transmitted through the first dichroic sheet to the second dichroic sheet and exits after being transmitted through the second dichroic sheet; the second wavelength light and the third wavelength light are reflected to the second light splitting plate through the first light splitting plate and then emitted after being transmitted through the second light splitting plate.

6. The illumination system of claim 4, wherein the first wavelength light exits after transmission through the first light splitter; the second wavelength light and the third wavelength light are transmitted to the second light splitter through the first light splitter and then emitted after being reflected by the second light splitter.

7. The illumination system of claim 4, wherein the first wavelength light is transmitted through the second light splitter to the first light splitter and then exits after being transmitted through the first light splitter; the second wavelength light and the third wavelength light are emitted after being reflected by the first light splitter.

8. The illumination system of claim 4, wherein the illumination system comprises a third light splitter for transmitting the excitation light; the first light splitter and the second light splitter are arranged in an intersecting manner; the first wavelength light is transmitted by the first light splitter and then emitted; the second wavelength light and the third wavelength light are emitted after being reflected by the first light splitter; the excitation light is transmitted to the first light splitter through the third light splitter and then is reflected by the first light splitter and then is emitted; and the fourth wavelength light is reflected to the second light splitting sheet by the third light splitting sheet and then emitted after being reflected by the second light splitting sheet.

9. The illumination system of claim 1, wherein the illumination system comprises a plurality of sets of collimators disposed in at least one of the light-emitting directions of the first light source, the combined light source, or the excitation light source.

10. The illumination system of claim 9, 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;

11. The illumination system of claim 1, further comprising a fourth light splitter and a fifth light splitter, the fourth light splitter and the fifth light splitter disposed in a propagation path of the second wavelength light and the third wavelength light, and the fourth light splitter and the fifth light splitter being non-parallel and non-intersecting with each other.

12. 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 11, which illumination system is provided in the housing.