CN113296341A

CN113296341A - Lighting system

Info

Publication number: CN113296341A
Application number: CN202110633586.5A
Authority: CN
Inventors: 陈时伟; 张硕杰
Original assignee: Young Optics Inc
Current assignee: Young Optics Inc
Priority date: 2017-04-28
Filing date: 2017-06-19
Publication date: 2021-08-24
Anticipated expiration: 2037-06-19
Also published as: CN108803218B; CN108803218A; TWI731073B; CN113296341B; TW201839494A

Abstract

The invention provides a lighting system which comprises a first light source capable of outputting first light, a second light source capable of outputting second light, a third light source capable of outputting third light, a fourth light source capable of outputting fourth light, a first fluorescent powder layer, a first light guide piece and a second light guide piece. The first light guide member is arranged between the light paths of the first light source and the second light source. The first light reaches the first fluorescent powder layer and is converted into fifth light, and the second light reaches the first fluorescent powder layer through the first light guide piece and is converted into sixth light. The fifth light and the sixth light have spectra, and peak wavelengths of the spectra of the fifth light and the sixth light are between 625 nm and 740 nm, respectively.

Description

Lighting system

Technical Field

The present invention relates to an illumination system, and more particularly, to an illumination system suitable for a projector.

Background

With the recent development of solid-state light sources and projection technologies, projection apparatuses mainly including solid-state light sources such as light-emitting diodes (LEDs) and laser diodes (laser diodes) have been gaining popularity in the market.

In a typical projector architecture, an illumination system is typically provided to provide illumination light. The illumination light passes through the light valve and then is converted into image light, and the image light can be projected on a screen or a wall surface after passing through the projection lens. The brightness of the image light output by the projector depends on the brightness of the illumination light provided by the illumination system. In an illumination system of a general projector, one blue light source can output blue light to excite a red phosphor to generate red light, and the other blue light source can output blue light to excite a green phosphor to generate green light. In addition, the red light, the green light and the blue light outputted by the blue light source together form three primary colors (RGB) of the illumination light outputted by the illumination system. In the conventional projector structure, a blue light source is usually additionally disposed to provide blue light to the green phosphor through other light paths to enhance the intensity of the green light excited by the green phosphor, thereby increasing the brightness of the light output from the illumination system.

Disclosure of Invention

The invention provides an illumination system, which outputs light with high brightness and has compact component configuration.

The illumination system of the embodiment of the invention comprises a first light source, a second light source, a third light source, a fourth light source, a first fluorescent powder layer, a first light guide piece and a second light guide piece. The first light source can output first light, the second light source can output second light, the third light source can output third light, and the fourth light source can output fourth light. The first light guide member is arranged between the light paths of the first light source and the second light source. The first light reaches the first fluorescent powder layer and is converted into fifth light, and the second light reaches the first fluorescent powder layer through the first light guide piece and is converted into sixth light. The fifth light and the sixth light have spectra, and peak wavelengths of the spectra of the fifth light and the sixth light are between 625 nm and 740 nm, respectively.

The lighting system of the embodiment of the invention comprises a first light-emitting element, a second light-emitting element, a third light-emitting element, a fourth light-emitting element, a fifth light-emitting element, a first fluorescent powder layer, a second fluorescent powder layer, a first light combining piece and a second light combining piece. The first light emitting element can output a first light beam, the second light emitting element can output a second light beam, the third light emitting element can output a third light beam, the fourth light emitting element can output a fourth light beam, and the fifth light emitting element can output a fifth light beam. The first fluorescent powder layer is arranged between the light paths of the first light-emitting element and the second light-emitting element, and the second fluorescent powder layer is arranged between the light paths of the third light-emitting element and the fourth light-emitting element. The first light combining piece is arranged between the light paths of the first light emitting element and the second light emitting element, and the second light combining piece is arranged between the light paths of the third light emitting element and the fourth light emitting element. The first light beam enters the first fluorescent powder layer and excites the sixth light beam; the second light beam enters the first fluorescent powder layer through the first light combining piece and excites a seventh light beam; the third light beam enters the second fluorescent powder layer and excites the eighth light beam; the fourth light beam enters the second fluorescent powder layer through the second light combining piece and excites the ninth light beam; the fifth light beam, the sixth light beam, the seventh light beam, the eighth light beam and the ninth light beam are output to the lighting system through the second light combining piece; the sixth light beam and the seventh light beam respectively have spectrums, and the difference of the peak wavelengths of the spectrums of the sixth light beam and the seventh light beam is less than 20 nanometers. The eighth light beam and the ninth light beam respectively have spectrums, and the difference of the peak wavelengths of the spectrums of the eighth light beam and the ninth light beam is less than 20 nanometers.

Based on the above, in the illumination system according to the related embodiment of the invention, the light having the peak wavelength between 625 nm and 740 nm is increased due to the output spectrum of the illumination system. When the illumination system is applied to a projection apparatus, for example, the light output by the projection apparatus has a high brightness. In addition, in the illumination system according to the related embodiment of the invention, since two additional sets of light sources are provided to excite the phosphors to respectively reinforce the outputs of the originally provided light sources, the internal space of the illumination system is properly utilized to reinforce the light output of the illumination system by increasing the number of the provided light sources, so that the configuration of the components of the illumination system is compact and the dead space thereof is reduced.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic diagram of an illumination system and a projection apparatus using the illumination system according to an embodiment of the invention;

fig. 2 is a schematic diagram of an illumination system and a projection apparatus using the illumination system according to another embodiment of the invention.

Description of reference numerals:

100. 300, and (2) 300: lighting system

200. 400: projection device

210. 410: light valve

220. 420: projection lens

B1, B2, B3, B4, B5, B6, B7, B8, B9: light beam

C1, C2: light combining piece

E1, E2, E3, E4, E5: light emitting element

G1, G2: light guide member

IM: projection light

L1, L2, L3, L4, L5, L6, L7, L8, L9: light ray

P1, P2, P1 ', P2': phosphor layer

S1, S2, S3, S4, S5: light source

Detailed Description

The optical device of the present invention is formed by a partially or totally reflective or transmissive material, usually composed of glass or plastic. The lens of the present invention refers to an optical element that allows at least part of light to pass through and at least one of the light incident surface and the light emergent surface is not a plane, such as a flat glass. The light combination of the present invention means that more than one light beam can be combined into one light beam for output. The light splitting means that one light beam can be split into a plurality of light beams for output.

Fig. 1 is a schematic diagram of an illumination system and a projection apparatus using the illumination system according to an embodiment of the invention, please refer to fig. 1. In the present embodiment, the projection apparatus 200 includes an illumination system 100, a light valve 210 and a projection lens 220. The lighting system 100 includes a light source S1, a light source S2, a light source S3, a light source S4, a light source S5, a phosphor layer P1, a phosphor layer P2, a light guide G1, and a light guide G2.

The design of each element will be described separately below. In the present embodiment, the light source S1 may output light L1, the light source S2 may output light L2, the light source S3 may output light L3, the light source S4 may output light L4, and the light source S5 may output light L8. The light source S1, the light source S2, the light source S3, the light source S4, and the light source S5 each include, for example, a Laser Diode (LD) chip, a light-emitting diode (LED) chip, or any of the above packages that can emit various visible lights. In the present embodiment, the light source S1, the light source S2, the light source S3, the light source S4 and the light source S5 include a blue led chip, and the color of the light L1, the light L2, the light L3, the light L4 and the light L8 is substantially blue. The light L1, the light L2, the light L3, the light L4 and the light L8 have a spectrum respectively. The spectrum refers to a pattern in which light rays are sequentially arranged according to the wavelength of light. In detail, peak wavelengths (peak wavelengths) of the spectra of the light L1, the light L2, the light L3, the light L4 and the light L8 are respectively between 400 nm and 475 nm, wherein the peak wavelength of the light spectrum is a wavelength corresponding to a position with maximum light intensity. More specifically, the light L1, the light L2, the light L3, the light L4 and the light L8 respectively have a corresponding spectral energy distribution curve (spectral energy distribution curve) in a spectral energy distribution diagram, and the peak of the distribution curve falls within the wavelength range of blue (e.g., 450 nm to 475 nm). Besides the light emitting chip itself, the light source S1, the light source S2, the light source S3, the light source S4 and the light source S5 may also be selectively provided with a lens (not labeled) having diopter respectively for converging the diverging direction of the light. In this embodiment, the lens is not disposed above each light source.

In addition, the phosphor layers P1 and P2 of the present invention at least include an optical element containing phosphor. More specifically, the phosphor layers P1 and P2 are a transparent colloid impregnated with phosphor; a fluorescent wheel; a phosphor sheet or other optical elements including phosphors and having a wavelength conversion function. In the present embodiment, the phosphor layer P1 is disposed on the light path of the light source S1, i.e., the phosphor layer P1 is disposed on the transmission path of the light L1. The phosphor layer P2 is disposed on the light path of the light source S3, i.e., the phosphor layer P2 is disposed on the transmission path of the light L3. The phosphor layers P1 and P2 may receive the excitation light and generate converted light by a Photoluminescence (Photoluminescence) phenomenon. Specifically, the phosphor layer P1 may receive blue light of the light L1 and generate the light L5, and may receive blue light of the light L2 and generate the light L6, for example. The light L5 and the light L6 have a spectrum, and the peak wavelengths of the spectra of the light L5 and the light L6 are between 625 nm and 740 nm, respectively. In this example, the positions of the light source S2 and the light source S1 can be reversed. More specifically, the light L5 and the light L6 have a corresponding spectral power distribution curve in a spectral power distribution diagram, and the peak of the distribution curve falls within the wavelength range of red (e.g., 625 nm to 740 nm). In addition, the phosphor layer P2 may receive blue light of the light L3 and generate the light L7, or receive blue light of the light L8 and generate the light L9, for example. The light L7 and the light L9 have a spectrum respectively, and the peak wavelengths of the spectra of the light L7 and the light L9 are between 495 nm and 570 nm. More specifically, the light L7 and the light L9 have a corresponding spectral power distribution curve in a spectral power distribution diagram, and the peak of the distribution curve falls within the wavelength range of green (e.g., 495 nm to 570 nm).

The light guide G1 and the light guide G2 of the present invention refer to a light splitter, a polarizer, a filter, a mirror, a lens, a plate glass, a prism, an integration rod, a light guide rod, or a combination comprising at least one of the foregoing. In detail, the spectroscopic plate generally refers to an optical element having a spectroscopic function, such as a half mirror, a polarizing plate for splitting light with P, S polarity, various wave plates, various prisms for splitting light at an incident angle, a spectroscopic plate for splitting light with a wavelength, and the like. Specifically, in the present embodiment, the light guide G1 and the light guide G2 have wavelength selectivity, and are color separation plates for performing light separation by wavelength (color), such as Dichroic Mirrors (DM). In related embodiments, the light guide G1 and the light guide G2 may be independent optical elements with color separation function, or may be color separation films or coatings plated on other members, which is not limited by the invention. In this embodiment, the light guide member G1 allows blue light to be reflected, red light to be transmitted, and green light to be reflected. The light guide member G2 allows blue light to reflect and other colors to transmit.

In the present embodiment, the light guide G1 is disposed between the light paths of the light sources S1 and S2 and between the light paths of the light sources S3 and S5. In detail, the light guide G1 is disposed on the transmission path of the light L2 emitted from the light source S2 and on the transmission path of the light L8 emitted from the light source S5. The light guide G2 is disposed between the light paths of the light sources S1 and S2, that is, the light guide G2 is disposed on the transmission path of the light L2 emitted from the light source S2. Specifically, the light guide G1 may reflect blue light and let green light pass through. The light guide member G2 reflects blue light and allows green and red light to pass through. In the present embodiment, the light L4, the light L5, the light L6, the light L7 and the light L9 respectively output the illumination system 100 through the light guide G2 to form illumination light.

In detail, the illumination system 100 may further include a light uniformizing element disposed on the transmission path of the illumination light for uniformizing the intensity distribution of the illumination light. Specifically, the light-homogenizing element may be an optical element such as a Fly-eye lens (Fly-eye lens) or a light integration rod (light integration rod), but the invention is not limited thereto. The illumination system 100 may further include other optical elements such as a lens, a diffuser, a mirror or a prism, etc. according to the actual requirement, which is not limited by the invention.

The light valve 210 of the present invention comprises a plurality of individual cells spatially arranged in a one-dimensional or two-dimensional array. Each unit can be independently controlled by optical signals or electric signals, and various physical effects (such as Pockels effect, Kerr effect, acousto-optic effect, magneto-optic effect, electro-optic effect of semiconductor, photorefractive effect and the like) are utilized to change the optical characteristics of the unit, so that the illuminating light illuminating the plurality of independent units is modulated, and the image light is output. The independent unit is an optical element such as a micro-reflector, a liquid crystal unit and the like. In detail, the light valve 210 of the present invention is a digital micro-mirror device (DMD), a Liquid Crystal On Silicon (LCOS) panel or a transmissive liquid crystal panel. In this embodiment, the light valve is a digital micromirror device, however, in other embodiments, the light valve 210 may also be a transmissive liquid crystal panel or other spatial light modulator, which is not limited by the invention. An optical element (not shown) such as a total reflection prism or an anti-total reflection prism may be included between the light valve 210 and the illumination system 100.

In addition, the projection lens 220 is composed of at least one lens. The projection lens 220 may have an aperture stop or optical path therein, and at least one lens is disposed in front of and behind the aperture stop to adjust the shape and aberration of the image light.

The arrangement of the elements of the projection apparatus 200 and the transmission process of the light are exemplarily described below. In the present embodiment, the light source S1 outputs the blue light L1, and the blue light L1 reaches the phosphor layer P1 and is converted into the red light L5. The light source S2 outputs blue light L2, which reaches the phosphor layer P1 through the light guide G1, and is converted into red light L6. Specifically, the light L2 is sequentially reflected by the light guide G2 and the light guide G1 and then transmitted to the phosphor layer P1. The light guide G2 is tilted with respect to the light source S2 such that the incident angle of the light L2 to the light guide G2 is, for example, 45 degrees. The light guide G2 is also substantially parallel to the light guide G1. Specifically, when the red light L5 and the red light L6 leave the phosphor layer P1, the red light L5 and the red light L6 are reflected by the light guide G1 and pass through the light guide G2. In addition, the light source S3 outputs blue light L3, and the light L3 reaches the phosphor layer P2 and is converted into green light L7. The light source S5 outputs blue light L8, and the light L8 reaches the phosphor layer P2 through the light guide G1 and is converted into green light L9. Specifically, the blue light L8 is reflected by the light guide G1 and transmitted to the phosphor layer P2. The light guide G1 is tilted with respect to the light source S5 such that the incident angle of the light L8 to the light guide G1 is, for example, 45 degrees. Specifically, after the green light L7 and the green light L9 leave the phosphor layer P2, the light L7 and the light L9 sequentially pass through the light guide G1 and the light guide G2. In addition, the light source S4 outputs blue light L4, and the light L4 is reflected on the light guide G2.

In the present embodiment, the light L4 reflected by the light guide G2 and the light L5, the light L6, the light L7, and the light L9 passing through the light guide G2 are combined into the illumination light and output from the illumination system 100. Specifically, the color of the light L4 is blue, the colors of the light L5 and the light L6 are red, and the colors of the light L7 and the light L9 are green. Therefore, the light L4, the light L5, the light L6, the light L7 and the light L9 can provide the three primary colors (RGB) of the illumination light. In the present embodiment, the illumination light is transmitted to the light valve 210, and the light valve 210 is used to convert the illumination light into the projection light IM. In addition, the projection lens 220 is used for projecting the projection light IM onto an image plane or a screen (not shown) to form an image frame.

The red light means that the peak wavelength of the spectrum of the light is between 625 nm and 740 nm. Therefore, the light (red light) with the peak wavelength between 625 nm and 740 nm of the spectrum output by the illumination system 100 is increased, so that the light output by the projection apparatus 200 has higher brightness. In addition, in the embodiment, the lighting system 100 is configured with the light source S1 and the light source S2 to provide the light L1 and the light L2 to excite the phosphor layer P1, respectively, and the lighting system 100 is configured with the light source S3 and the light source S5 to provide the light L3 and the light L8 to excite the phosphor layer P2, respectively. In other words, the illumination system 100 is provided with two additional sets of light sources to excite the phosphors, so as to respectively reinforce the outputs of the originally provided light sources. Therefore, the internal space of the illumination system 100 is properly utilized to enhance the light output of the illumination system 100 by increasing the number of light sources, so that the component configuration of the illumination system 100 is compact and the dead space thereof is reduced.

With continued reference to fig. 1, the related components of the present embodiment are described in another description manner below. In this embodiment, the light-emitting device includes a light-emitting element E1, a light-emitting element E2, a light-emitting element E3, a light-emitting element E5, a light-emitting element E4, a phosphor layer P1 ', a phosphor layer P2', a light-combining element C1, and a light-combining element C2.

The light emitting device of the present invention is an optical device capable of generating light. More specifically, the light emitting device refers to a light emitting diode chip, a laser diode chip, a module packaged by the aforementioned chips, or other devices or combinations thereof capable of achieving the same effect.

The light combining material C1 and the light combining material C2 of the present invention are optical elements having a light combining function. More specifically, the light combiner C1 and the light combiner C2 refer to a light splitter, a polarizer, a filter, a reflector, a lens, a plate glass, a prism, an integrator rod, a light guide rod, or a combination comprising at least one of the foregoing. The beam splitter is broadly referred to as a half mirror, a polarizing plate for splitting light with P, S polarity, various wave plates, various prisms for splitting light at an incident angle, a beam splitter for splitting light with a wavelength, and the like. Specifically, in the present embodiment, the light combining element C1 and the light combining element C2 have wavelength selectivity, and are color separation plates for performing light separation by wavelength (color), such as Dichroic Mirrors (DM). In related embodiments, the light combining element C1 and the light combining element C2 may be disposed independently, or may be a color separation film or a coating layer plated on other members, which is not limited in the present disclosure. The light beam B1, the light beam B2, the light beam B3, the light beam B4, the light beam B5, the light beam B6, the light beam B7, the light beam B8, and the light beam B9 are similar to those in the previous example, and therefore, the description thereof is omitted.

Fig. 2 is a schematic diagram of an illumination system and a projection apparatus using the illumination system according to another embodiment of the invention. Referring to fig. 2, in the present embodiment, the illumination system 300 and the projection apparatus 400 are similar to the illumination system 100 and the projection apparatus 200 of the embodiment of fig. 1, and the differences are as follows. In the present embodiment, the projection apparatus 400 includes an illumination system 300, a light valve 410 and a projection lens 420. The lighting system 300 includes a light emitting element E1, a light emitting element E2, a light emitting element E3, a light emitting element E4, a light emitting element E5, a phosphor layer P1 ', a phosphor layer P2', a light combining element C1, and a light combining element C2.

The design of each element will be described separately below. In the present embodiment, the light emitting element E1 may output the light beam B1, the light emitting element E2 may output the light beam B2, the light emitting element E3 may output the light beam B3, the light emitting element E4 may output the light beam B4, and the light emitting element E5 may output the light beam B5. In the present embodiment, the light emitting device E1, the light emitting device E2, the light emitting device E3, the light emitting device E4 and the light emitting device E5 include a blue light emitting diode chip, and the color of the light beam B1, the light beam B2, the light beam B3, the light beam B4 and the light beam B5 is substantially blue, for example. The light beam B1, the light beam B2, the light beam B3, the light beam B4 and the light beam B5 respectively have a spectrum, and peak wavelengths of the spectra of the light beam B1, the light beam B2, the light beam B3, the light beam B4 and the light beam B5 are respectively between 400 nanometers and 475 nanometers. In addition, in the embodiment, the operation manners of the light beam B1, the light beam B2, the light beam B3, the light beam B4 and the light beam B5 are similar to the light beams L1, L2, L3, L4 and L8 in the embodiment of fig. 1, and are not described again here.

In addition, in the present embodiment, the phosphor layer P1 'is disposed between the optical paths of the light emitting element E1 and the light emitting element E2, and the phosphor layer P2' is disposed between the optical paths of the light emitting element E3 and the light emitting element E4. The phosphor layer P1' may receive, for example, blue light of the light beam B1 and generate the light beam B6, and may receive blue light of the light beam B2 and generate the light beam B7. The light beams B6 and B7 have a spectrum, and the peak wavelengths of the spectra of the light beams B6 and B7 are respectively 495 nm to 570 nm. The difference between the peak wavelengths of the spectra of the light beams B6 and B7 is, for example, less than 20 nm. Specifically, the color of the light beam B6 and the light beam B7 is, for example, green. In the present embodiment, the operation of the light beam B6 and the light beam B7 is similar to the light beam L7 and the light beam L9 of the embodiment of fig. 1, and therefore, the detailed description thereof is omitted. In addition, the phosphor layer P2' may receive blue light of the light beam B3 and generate the light beam B8, and may receive blue light of the light beam B4 and generate the light beam B9, for example. The light beams B8 and B9 have a spectrum, respectively, and the peak wavelengths of the spectra of the light beams B8 and B9 are between 625 nm and 740 nm, respectively. The difference between the peak wavelengths of the spectra of the light beams B8 and B9 is, for example, less than 20 nm. Specifically, the color of the light beam B8 and the light beam B9 is, for example, red. In the present embodiment, the light beams B8 and B9 are similar to the light beams L5 and L6 of the embodiment of fig. 1, and are not described again.

In the present embodiment, the light combining element C1 is disposed between the light paths of the light emitting element E1 and the light emitting element E2, and the light combining element C2 is disposed between the light paths of the light emitting element E3 and the light emitting element E4. The relative relationship between the light combining element C1 and the light combining element C2 is similar to the light guide element G1 and the light guide element G2 in the embodiment of fig. 1, and is not repeated here. The light combining piece C1 can reflect the light beam B5 and can pass through the light beam B6, the light beam B7, the light beam B8 and the light beam B9. The light combining piece C2 can reflect the light beam B8 and the light beam B9 and can pass the light beam B5, the light beam B6 and the light beam B7. In the present embodiment, the light beam B5, the light beam B6, the light beam B7, the light beam B8, and the light beam B9 respectively output the illumination system 100 through the light combining element C2 to form illumination light.

In this embodiment, the related descriptions of the light valve 410 and the projection lens 420 can refer to the related descriptions of the light valve 210 and the projection lens 220 in the embodiment of fig. 1, respectively, and are not repeated herein.

The arrangement of the elements of the projection apparatus 400 and the transmission process of the light are exemplarily described as follows. In the present embodiment, the light emitting element E1 outputs the light beam B1, and the light beam B1 enters the phosphor layer P1' and excites the light beam B6. The light emitting element E2 outputs a light beam B2, and the light beam B2 enters the phosphor layer P1' via the light combiner C1 and excites the light beam B7. In detail, the light beam B2 is reflected by the light combiner C1 and transmitted to the phosphor layer P1'. After the light beam B6 and the light beam B7 leave the phosphor layer P1', the light beam B6 and the light beam B7 sequentially pass through the light combining element C1 and the light combining element C2. In addition, the light emitting element E3 outputs a light beam B3, and the light beam B3 enters the phosphor layer P2' and excites the light beam B8. The light emitting element E4 outputs a light beam B4, and the light beam B4 enters the phosphor layer P2' via the light combiner C2 and excites the light beam B9. In detail, the light beam B4 passes through the light combiner C2 and then is transmitted to the phosphor layer P2'. When the light beams B8 and B9 leave the phosphor layer P2', the light beams B8 and B9 are reflected on the light combiner C2. Further, the light emitting element E5 outputs a light beam B5, and the light beam B5 is reflected on the light combining piece C1 and passes through the light combining piece C2.

In the present embodiment, the light beam B8 and the light beam B9 reflected on the light combining element C2, and the light beam B5, the light beam B6 and the light beam B7 passing through the light combining element C2 are combined into the illumination light and output from the illumination system 300. Specifically, the color of the light beam B5 is blue, the colors of the light beam B6 and the light beam L7 are green, and the colors of the light beam B8 and the light beam B9 are red. Therefore, the light beam B5, the light beam B6, the light beam B7, the light beam B8, and the light beam B9 can provide the three primary colors of illumination light.

In detail, the illumination system 300 and the projection apparatus 400 can achieve at least the similar technical effects as the illumination system 100 and the projection apparatus 200 in the embodiment of fig. 1. The light output by the projection apparatus 400 has higher brightness. In addition, the internal space of the illumination system 300 is properly utilized to enhance the light output of the illumination system 300 by additionally arranging the light source, so that the component configuration of the illumination system 300 is compact and the useless space thereof is reduced.

With continued reference to fig. 2, the related components of the present embodiment are described in a second description manner. In the present embodiment, the light source includes a light source S3, a light source S5, a light source S1, a light source S2, a light source S4, a phosphor layer P2, a phosphor layer P1, a light guide G2, and a light guide G1. In addition, in terms of travel, the light beam B1 is similar to the light beam L3, the light beam B2 is similar to the light beam L8, the light beam B3 is similar to the light beam L1, the light beam B4 is similar to the light beam L2, the light beam B5 is similar to the light beam L4, the light beam B6 is similar to the light beam L7, the light beam B7 is similar to the light beam L9, the light beam B8 is similar to the light beam L5, and the light beam B9 is similar to the light beam L6.

In this embodiment, the descriptions of the components (e.g., the light source S1, the light source S2, the light source S3, the light source S4, the light source S5, the phosphor layer P1, the phosphor layer P2, the light guide G1, the light guide G2, the light ray L1, the light ray L2, the light ray L3, the light ray L4, the light ray L5, the light ray L6, the light ray L7, the light ray L8, and the light ray L9) described in the second description mode at least refer to the description of the embodiment in the foregoing paragraphs related to fig. 2, and are not repeated herein.

In summary, in the related embodiments of the invention, the peak wavelength of the light output from the illumination system is increased from 625 nm to 740 nm. When the illumination system is applied to a projection apparatus, for example, the light output by the projection apparatus has a high brightness. In addition, in the illumination system according to the related embodiment of the invention, since two additional sets of light sources are provided to excite the phosphors to respectively reinforce the outputs of the originally provided light sources, the internal space of the illumination system is properly utilized to reinforce the light output of the illumination system by increasing the number of the provided light sources, so that the configuration of the components of the illumination system is compact and the dead space thereof is reduced.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An illumination system, comprising:

a first light emitting element that can output a first light beam;

a second light emitting element capable of outputting a second light beam;

a third light emitting element capable of outputting a third light beam;

a fourth light emitting element capable of outputting a fourth light beam;

a fifth light emitting element capable of outputting a fifth light beam, wherein the peak wavelength of the spectrum of the first, second, third, fourth and fifth light beams is between 400 nm and 475 nm;

a first phosphor layer;

a second phosphor layer;

a first light combining member; and

a second light-combining component which is arranged on the second light-combining component,

wherein the first light beam from the first light emitting element enters the first phosphor layer and excites a sixth light beam, the sixth light beam penetrates the second light combining member after being reflected by the first light combining member, the second light beam enters the first phosphor layer and excites a seventh light beam after being sequentially reflected by the second light combining member and the first light combining member, the seventh light beam penetrates the second light combining member after being reflected by the first light combining member, peak wavelengths of spectra of the sixth light beam and the seventh light beam are between 625 nanometers and 740 nanometers, the third light beam from the third light emitting element enters the second phosphor layer and excites an eighth light beam, the eighth light beam sequentially penetrates the first light combining member and the second light combining member, the fourth light beam from the fourth light emitting element enters the second phosphor layer and excites a ninth light beam after being reflected by the first light combining member, the ninth light beam sequentially penetrates through the first light combining element and the second light combining element, the peak wavelengths of the spectrums of the eighth light beam and the ninth light beam are between 495 nanometers and 570 nanometers, the fifth light beam from the fifth light emitting element is reflected by the second light combining element, and the fifth light beam, the sixth light beam, the seventh light beam, the eighth light beam and the ninth light beam are output to the illumination system through the second light combining element.

2. The illumination system of claim 1, wherein the first and second light combiners each comprise a dichroic mirror.

3. The illumination system of claim 1, wherein the peak wavelengths of the spectra of the first, second, third, fourth, and fifth light beams are between 450 nm and 475 nm, respectively.