CN109557750B - Illumination system and projection apparatus using the same - Google Patents
Illumination system and projection apparatus using the same Download PDFInfo
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- CN109557750B CN109557750B CN201710879277.XA CN201710879277A CN109557750B CN 109557750 B CN109557750 B CN 109557750B CN 201710879277 A CN201710879277 A CN 201710879277A CN 109557750 B CN109557750 B CN 109557750B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
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- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention discloses an illumination system, which comprises an excitation light source group, a color separation element, a first lens group, a fluorescent powder rotating wheel, at least one reflecting element and a light condensation element. The excitation light source group is used for providing a first color light beam. The first color light beam sequentially passes through the dichroic element and the first lens group and is transmitted to the fluorescent powder rotating wheel. The first part of the first color light beam is converted into a second color light beam by the light wavelength conversion part of the fluorescent powder rotating wheel, and the second color light beam is reflected back to the color separation element and then reflected back to the light condensation element by the color separation element. The second part of the first color light beam is reflected back to the color separation element by the reflection part of the fluorescent powder rotating wheel, passes through the color separation element and is transmitted to the at least one reflection element, and is reflected by the at least one reflection element and passes through the color separation element again to be transmitted to the light condensation element. The invention also provides a projection device with the illumination system. The lighting system can simplify the complex light path, thereby reducing the whole volume.
Description
Technical Field
The present invention relates to a light source module, and more particularly, to an illumination system and a projection apparatus using the same.
Background
A Digital Light Processing (DLP) projection apparatus includes an illumination system, a digital micro-mirror device (DMD), and a projection lens, wherein the illumination system is configured to provide an illumination beam, the DMD is configured to convert the illumination beam into an image beam, and the projection lens is configured to project the image beam onto a screen to form an image on the screen. Ultra-high pressure mercury lamps are a common light source used in early illumination systems, which provide white light as the illumination beam. With the development of lighting technology, light sources with energy saving advantages, such as light emitting diode light sources and laser light sources (laser diodes), are also gradually used.
Fig. 1 is a schematic view of a known illumination system using a laser light source. Referring to fig. 1, in a conventional illumination system 100, a blue light beam 112 provided by a laser light source module 110 passes through a collimating element 122, then passes through a dichroic mirror (dichroic mirror)130, and then passes through lenses 123, 124 to irradiate a rotatable phosphor wheel (phosphor wheel) 140. The phosphor wheel 140 can be divided into a green phosphor region, a yellow phosphor region, and a light transmitting region (transmissive zone), wherein the back 141 of the green phosphor region and the yellow phosphor region of the phosphor wheel 140 are correspondingly provided with a reflective element (not shown). The blue light beam 112 irradiates the green phosphor region, the yellow phosphor region and the light transmission region in sequence, the blue light beam 112 irradiates the green phosphor region and the yellow phosphor region to excite the green light beam 113 and the yellow light beam 114, the reflective element reflects the green light beam 113 and the yellow light beam 114 to the color separation plate 130, and then the green light beam 113 and the yellow light beam 114 are reflected by the color separation plate 130 and then pass through the lens 125 to irradiate the rotatable filter wheel 150. In addition, a part of the blue light beam 112 passes through the light transmitting region and sequentially passes through the lenses 126 and 127, the reflective elements 161 and 162, the lens 128, the reflective element 163, the lens 129, the color separation plate 130, and the lens 125 to irradiate the color filter wheel 150.
As described above, the color filter wheel 150 has a red light filter region and a transparent region corresponding to a portion of the yellow phosphor region, a green light filter region corresponding to the green phosphor region, and a diffusion region corresponding to the light transmission region. By controlling the color filter wheel 150 and the phosphor wheel 140 to rotate in coordination with each other, the green light beam 113 irradiates the green filter area, the yellow light beam 114 irradiates the red filter area and the transparent area, and the blue light beam 112 irradiates the diffusion area. Thus, the light beam entering the light integrating rod 170(rod) after passing through the color filter wheel 150 includes a blue light beam, a green light beam, a red light beam and a yellow light beam for forming a color image.
The known illumination system 100 has the disadvantages of high cost, large volume and poor optical efficiency due to the complex architecture and the need for many optical elements.
The background section is only provided to aid in understanding the present disclosure, and therefore the disclosure in the background section may include some known techniques that do not constitute a part of the knowledge of those skilled in the art. Furthermore, the disclosure in the "background" does not represent a material or problem to be solved by one or more embodiments of the present invention, nor is it intended to be known or recognized by one skilled in the art prior to the filing of the present application.
Disclosure of Invention
The invention provides an illumination system, which is used for simplifying a complex light path and further reducing the volume.
The invention provides a projection device which has the advantage of small volume.
Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention.
In order to achieve one or a part of or all of the above objectives or other objectives, an embodiment of the invention provides an illumination system, which includes an excitation light source set, a first lens set, a phosphor wheel, at least one reflective element, and a light-collecting element. The excitation light source group is provided with a first optical axis and is used for providing a first color light beam. The color separation element is configured on a transmission path of the first color light beam and is used for enabling the first color light beam to pass through. The first lens group is arranged on one side of the color separation element far away from the laser source group and is used for enabling the first color light beam passing through the color separation element to pass through, and the first lens group is provided with a second optical axis, wherein the second optical axis and the first optical axis are not coaxial with each other. The fluorescent powder rotating wheel is arranged on one side of the first lens group far away from the color separation element, and is provided with a light wavelength conversion part and a reflection part, wherein the light wavelength conversion part is used for converting a first part of the first color light beam passing through the first lens group into a second color light beam and reflecting the second color light beam back to the color separation element, the reflection part is used for reflecting a second part of the first color light beam passing through the first lens group back to the color separation element, and the color separation element is used for reflecting the second color light beam and enabling the second part of the first color light beam to pass through. The at least one reflecting element is arranged on one side of the color separation element, which is adjacent to the laser light source group, and is separated from the color separation element by a distance. And the condensing element is arranged on one side of the color separation element, which is adjacent to the first lens group, and is used for enabling the second part of the first color light beam reflected by the at least one reflecting element and the second color light beam reflected by the color separation element to pass through.
In order to achieve one or a part of or all of the above objectives or other objectives, an embodiment of the invention provides a projection apparatus including the illumination system, a light valve and a projection lens. The illumination system is used for providing an illumination light beam. The light valve is disposed on a transmission path of the illumination beam provided by the illumination system to convert the illumination beam into an image beam. The projection lens is configured on the transmission path of the image light beam.
In the illumination system of the embodiment of the invention, the dichroic element, the first lens group and the at least one reflective element are arranged on the transmission path of the first color light beam, and the first color light beam provided by the laser source group is transmitted to the light wavelength conversion part and the reflective part of the phosphor wheel by the first lens group, so that after the second color light beam reflected by the light wavelength conversion part and the second part of the first color light beam reflected by the reflective part are reflected back to the dichroic element, the second color light beam is reflected by the dichroic element, and the second part of the first color light beam passing through the dichroic element is reflected back to the dichroic element by the at least one reflective element, so that the second part of the first color light beam and the second color light beam are transmitted to the condensing element along the same path to form the illumination light beam. Compared with the prior art, the illumination system of the embodiment of the invention uses fewer optical elements, so that the complex light path can be simplified, and the volume of the illumination system and the projection device using the illumination system can be reduced.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic view of a known illumination system using a laser light source.
Fig. 2 is a schematic view of an illumination system of an embodiment of the present invention.
Fig. 3 is a schematic front view of the phosphor wheel of fig. 2.
FIG. 4 is a schematic side view of a phosphor wheel of an illumination system according to another embodiment of the invention.
Fig. 5 is a schematic view of a lighting system of another embodiment of the present invention.
Fig. 6 is a schematic view of a lighting system of another embodiment of the present invention.
Fig. 7 is a schematic view of an illumination system of another embodiment of the present invention.
Fig. 8 is a schematic view of a lighting system of another embodiment of the present invention.
Fig. 9 is a schematic view of an illumination system of another embodiment of the present invention.
Fig. 10 is a schematic view of an illumination system of another embodiment of the present invention.
Fig. 11 is a schematic view of an illumination system of another embodiment of the present invention.
Fig. 12 is a schematic view of a projection apparatus according to an embodiment of the invention.
Detailed Description
The foregoing and other technical and scientific aspects, features and utilities of the present invention will be apparent from the following detailed description of a preferred embodiment when read in conjunction with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Fig. 2 is a schematic diagram of an illumination system according to an embodiment of the invention, and fig. 3 is a schematic front view of the phosphor wheel of fig. 2. Referring to fig. 2 and fig. 3, the illumination system 200 of the present embodiment includes an excitation light source set 210, a color separation element 220, a first lens assembly 230, a phosphor wheel 240, at least one reflective element 250 (fig. 2 is a mirror for example), and a light-condensing element 260. The excitation light source set 210 has a first optical axis a1, and the excitation light source set 210 is used for providing a first color light beam B1. The color separation element 220 is disposed on a transmission path of the first color light beam B1, and the color separation element 220 is used for allowing the first color light beam B1 to pass through. The first lens group 230 is disposed on a side of the dichroic element 220 away from the laser source group 210, in other words, the first lens group 230 and the excitation light source group 210 are respectively disposed on two opposite sides of the dichroic element 220 for passing the first color light beam B1 passing through the dichroic element 220, and the first lens group 230 has a second optical axis a2, wherein the second optical axis a2 and the first optical axis a1 are not coaxial with each other, and a so-called optical axis is defined as a direction of a principal ray of the optical element. The phosphor wheel 240 is disposed on a side of the first lens assembly 230 away from the dichroic element 220, in other words, the phosphor wheel 240 and the dichroic element 220 are disposed on opposite sides of the first lens assembly 230, respectively, the phosphor wheel 240 has a wavelength conversion portion 241 and a reflection portion 242, the wavelength conversion portion 241 is configured to convert a first portion B11 of the first color light beam B1 passing through the first lens assembly 230 into a second color light beam B2 and reflect the second color light beam B2 back to the dichroic element 220, the reflection portion 242 is configured to reflect a second portion B12 of the first color light beam B1 passing through the first lens assembly 230 back to the dichroic element 220, and the dichroic element 220 is further configured to reflect the second color light beam B2 and pass the second portion B12 of the first color light beam B1. The reflective element 250 is disposed on a side of the color separation element 220 adjacent to the laser source set 210 and spaced apart from the color separation element 220 by a distance D1, and the reflective element 250 is used for reflecting the second portion B12 of the first color light beam passing through the color separation element 220, so that the second portion B12 of the first color light beam passes through the color separation element 220 again. The light condensing element 260 is disposed on a side of the color separation element 220 adjacent to the first lens group 230, and the light condensing element 260 is used for allowing the second portion B12 of the first color light beam B1 reflected by the reflective element 250 and the second color light beam B2 reflected by the color separation element 220 to pass through.
The excitation light source set 210 of the present embodiment includes an excitation light source 211 and a second lens set 212, for example, the excitation light source 211 includes a plurality of laser elements (not shown), for example, the laser elements are arranged in an array, and the laser elements are, for example, Laser Diodes (LDs). In addition, in other embodiments, there may be one laser element of the excitation light source 211. In addition, the excitation Light source 211 of the present invention is not limited to a laser device, and an appropriate Light source, such as a Light-emitting diode (LED), may be selected according to design requirements.
Further, a surface 2111 of the excitation light source 211 facing the second lens group 212 has a central axis N1, the second lens group 212 has a first optical axis a1, and the central axis N1 and the first optical axis a1 are coaxial with each other. The second lens group 212 includes, for example, two lenses 2121 and 2122, the lens 2121 is disposed between the excitation light source 211 and the lens 2122, and the central axis N1 of the excitation light source 211 and the first optical axis a1 are coaxial with each other. However, the present invention is not limited thereto, and the central axis N1 of the excitation light source 211 and the first optical axis a1 may not be coaxial with each other, and the position of the excitation light source 211 may be adjusted according to design requirements. In one embodiment, the central axis N1 of the excitation light source 211 is parallel to the first optical axis a1, and the central axis N1 is a distance (not shown) from the first optical axis a1, which may be 0.2mm, for example, but the invention is not limited thereto.
The color separation element 220 of the present embodiment is, for example, a Dichroic mirror (Dichroic mirror), and is suitable for separating at least two light beams with different wavelength ranges, but not limited thereto, so that each light beam passes along a different path. Specifically, the color separation element 220 is used for passing the first color light beam B1 from the excitation light source group 210 and reflecting the second color light beam B2 from the phosphor wheel 240.
The first lens assembly 230 of the present embodiment includes, for example, two lenses 231 and 232, the lens 231 is disposed between the dichroic element 220 and the lens 232, wherein the lenses 231 and 232 have a central axis, and the second optical axis a2 is the central axis. As shown in fig. 2, the second optical axis a2 is, for example, parallel to the first optical axis a1 of the excitation light source set 210, wherein the second optical axis a2 has a distance D2 from the first optical axis a 1. In one embodiment, the distance D2 may be 5.5mm, but the invention is not limited thereto.
The phosphor wheel 240 of the present embodiment includes, for example, a turntable 243 and a motor (not shown) for driving the turntable 243 to rotate, and the light wavelength conversion part 241 and the reflection part 242 are disposed on the turntable 243, for example. The turntable 243 is, for example, a reflective metal substrate or a mirror, and the light wavelength conversion part 241 is, for example, a phosphor layer disposed on the turntable 243. The phosphor is, for example, a yellow phosphor, but not limited thereto, and in other embodiments, the phosphor layer may also include a phosphor layer capable of emitting two colors, such as a phosphor capable of emitting a yellow light beam and a phosphor capable of emitting a green light beam. The first portion B11 of the first light beam B1 is the first light beam B1 irradiated on the light wavelength conversion part 241, and the second portion B12 of the first light beam B1 is the first light beam B1 irradiated on the reflection part 242. When the motor drives the turntable 243 to rotate, the first color light beam B1 provided by the excitation light source set 210 alternately irradiates the light wavelength conversion part 241 and the reflection part 242, so that the first part B11 of the first color light beam B1 excites the phosphor to generate the second color light beam B2. In addition, the second portion B12 of the first color light beam B1 is irradiated to the reflection portion 242 and reflected back to the color separation element 220. The first color light beam B1 in this embodiment is, for example, a blue light beam, and the second color light beam B2 is, for example, a yellow light beam or a green light beam, but not limited thereto.
The reflecting element 250 of the present embodiment is exemplified by a reflecting mirror for reflecting the second portion B12 of the first color light beam B1 passing through the dichroic element 220. However, the present invention is not limited thereto, and the number of the reflecting elements 250 may be plural.
Based on the above-mentioned optical path design structure of the illumination system 200, the first color light beam B1 provided by the excitation light source set 210 passes through the color separation element 220 and the first lens assembly 230 and irradiates the phosphor wheel 240. Since the first optical axis a1 and the second optical axis a2 are not coaxial with each other, the first color light beam B1 is refracted by the first lens assembly 230 such that the first color light beam B1 is obliquely incident on the phosphor wheel 240, and then is reflected by the phosphor wheel 240 and then passes through a path different from the path of the incident light. In detail, the first portion B11 of the first color light beam B1 irradiates the light wavelength conversion portion 241 of the phosphor wheel 240 to excite the second color light beam B2, the second color light beam B2 is reflected by the turntable 243, and the second color light beam B2 passes through the first lens assembly 230 and is transmitted to the color separation element 220. The second color light beam B2 is reflected by the dichroic element 220 to pass to the condensing element 260. On the other hand, the second portion B12 of the first color light beam B1 irradiates the reflection portion 242 of the phosphor wheel 240, is reflected by the reflection portion 242, passes through the first lens group 230 and the dichroic element 220 to be transmitted to the reflection element 250, is further reflected by the reflection element 250, passes through the dichroic element 220 again to be transmitted to the light converging element 260, so that the second portion B12 of the first color light beam B1 and the second color light beam B2 can be transmitted to the light converging element 260 along the same path.
In this way, in the illumination system 200 according to the embodiment of the invention, the dichroic element 220, the first lens group 230 and the at least one reflective element 250 are disposed on the transmission path of the first color light beam B1, and the first color light beam B1 provided by the laser source group 210 is transmitted to the light wavelength conversion part 241 and the reflective part 242 of the phosphor wheel 240 by the first lens group 230, so that after the second color light beam B2 reflected by the light wavelength conversion part 241 and the second part B12 of the first color light beam B1 reflected by the reflective part 242 are reflected back to the dichroic element 220, the second color light beam B2 is reflected by the dichroic element 220, and the second part B12 of the first color light beam B1 passing through the dichroic element 220 is reflected back to the dichroic element 220 by the reflective element 250, so that the second part B12 of the first color light beam B1 and the second color light beam B2 are transmitted to the condensing element 260 along the same path to form the illumination light beam B51. The illumination system 200 of the embodiment of the invention can simplify the complicated light path and reduce the volume of the whole illumination system.
In addition, the illumination system 200 of the present embodiment further includes a light integration rod 270 and a filter color wheel 280, and the filter color wheel 280 is disposed between the light integration rod 270 and the light condensing element 260. The second portion B12 of the first color light beam B1 and the second color light beam B2 are separated into a plurality of sub-beams with different colors, such as a red sub-beam, a green sub-beam, and a blue sub-beam, as the color filter wheel 280 rotates.
When the illumination system 200 is applied to a projection apparatus, if the color point of the first color light (e.g., blue light) is obviously problematic during imaging, the design of the phosphor color wheel 240 in the illumination system 200 can be improved. For example, as shown in fig. 4, the phosphor wheel 240a further has a light wavelength conversion layer 244 disposed on the reflection portion 242 and covering the reflection portion 242, the light wavelength conversion layer 244 is used for converting the second portion B12 of the first color light beam B1 into a third color light beam, and the third color light beam is reflected by the phosphor wheel 240a to the color separation element and reflected by the color separation element to the light collection element. Specifically, the light wavelength conversion layer 244 has a phosphor, and the phosphor is a green phosphor, but not limited thereto. The light wavelength conversion layer 244 can convert a part of the second portion of the first color light beam passing through the first lens group into a third color light beam, and the wavelength range of the first color light beam includes the wavelength range of the third color light beam. Thus contributing to improving the apparent problem of the color point of the first color light (e.g., blue light). In addition, the light wavelength conversion layer 244 is, for example, a thin film, and phosphors are dispersed in the light wavelength conversion layer 244, so that a part of the light beam of the second portion of the first color light beam can still be reflected back to the dichroic element, and another part of the light beam is converted into a third color light beam.
On the other hand, by adjusting the optical path design structure of the illumination system, when the second portion B12 of the first color light beam B1 is transmitted to the light integrating rod 270, the reflection element 250 reduces the included angle between the principal ray direction of the second portion B12 of the first color light beam B1 and the central axis N2 of the light integrating rod 270, so as to improve the color uniformity during subsequent imaging, which is described in detail below.
Fig. 5 is a schematic view of a lighting system of another embodiment of the present invention. Referring to fig. 5, an illumination system 200a of another embodiment of the present invention is similar to the illumination system 200 of the previous embodiment, and the main difference is that the number of the reflective elements of the illumination system 200a of the present embodiment is two, that is, the reflective elements 251 and 252, and the reflective elements 251 and 252 are, for example, mirrors, for sequentially reflecting the second portion B12 of the first color light beam B1 passing through the color separation element 220, so that the second portion B12 of the first color light beam B1 can return to the color separation element 220 again, and the second color light beam B2 and the second portion B12 of the first color light beam B1 are transmitted to the light condensation element 260 to form an illumination light beam B52. Therefore, the reflective elements 251 and 252 help to make the angle between the main light beam direction of the second portion B12 of the first color light beam B1 and the central axis N2 of the light integrating rod 270 smaller, so as to improve the color uniformity in the subsequent imaging. In addition, although the reflective elements 251 and 252 in fig. 5 are illustrated as having spherical reflective surfaces, the number of the reflective elements and the shape of the reflective surfaces thereof can be selected according to design requirements, for example, any combination of the reflective elements having spherical reflective surfaces and the reflective elements having planar reflective surfaces, or the reflective elements both having planar reflective surfaces can be selected, but not limited thereto.
Fig. 6 is a schematic view of a lighting system of another embodiment of the present invention. Referring to fig. 6, the lighting system 200b of the present embodiment is similar to the lighting system 200 of the previous embodiment, and the main difference is that compared to fig. 2, the position of the reflective element 250 of the present embodiment is, for example, shifted to the right side to be closer to the dichroic element 220. The central axis N2 of the light integration rod 270 is coaxial with the optical axis A3 of the light condensing element 260, for example, and the geometric center O of the reflecting element 250 is located on the extension line of the central axis N2, for example, so that the second portion B12 of the first color light beam B1 reflected by the reflecting element 250 uniformly surrounds the optical axis A3 of the light condensing element 260.
Fig. 7 is a schematic view of an illumination system of another embodiment of the present invention. Referring to fig. 7, an illumination system 200c according to another embodiment of the present invention is similar to the illumination system 200 according to the previous embodiment, and the main difference is that the structure design of the color filter wheel 280a is different. Specifically, the color filter 280a has at least one light filter portion 281 and a light-transmitting portion 282, the at least one light filter portion 281 is used for the second color light beam B2 to penetrate, the light-transmitting portion 282 is used for the second portion B12 of the first color light beam B1 to penetrate, and the light-transmitting portion 282 is provided with a micro-prism structure 283 for refracting the second portion B12 of the first color light beam B1. The microprism structure 283, for example, has a plurality of parallel inclined planes, and can change the light emitting path of the second portion B12 of the first color light beam B1 passing through each inclined plane to form the illumination light beam B54 with the second color light beam B2, so as to help to reduce the included angle between the optical axis of the second portion B12 of the first color light beam B1 and the central axis N2 of the light integrating rod 270, thereby improving the color uniformity in subsequent imaging. However, the present invention is not limited to the shape of the microprism structure 283 of fig. 7, and can be adjusted according to design requirements.
Fig. 8 is a schematic view of a lighting system of another embodiment of the present invention. Referring to fig. 8, an illumination system 200d according to another embodiment of the present invention is similar to the illumination system 200 of the previous embodiment, and the main difference is that the dichroic element 220a has a different structure. Specifically, the color separation element 220a has, for example, a color separation part 221a and a light separation part 222a, the color separation part 221a and the light separation part 222a are adjacent to each other, and the color separation part 221a and the light separation part 222a are bonded to each other, for example, but not limited thereto. The dichroic unit 221a is located on a transmission path of the first color light beam B1 from the laser light source group 210, the dichroic unit 222a is located on a transmission path of the second portion B12 of the first color light beam reflected from the phosphor wheel 240, and the second color light beam B2 is reflected by the phosphor wheel 240 to the dichroic unit 221a and the dichroic unit 222 a. The color separation section 221a is configured to transmit the first color light beam B1 therethrough and reflect the second color light beam B2. The dichroic portion 222a is used for transmitting a part of the second portion B12 of the first color light beam to the at least one reflection element 250, and the dichroic portion 222a is used for reflecting another part of the second portion B12 of the first color light beam B1 and the second color light beam B2 to be transmitted to the light condensing element 260. The second part B12 of the first color light beam reflected by the at least one reflecting element 250 is transmitted to the condensing element 260 through the dichroic portion 221a, and the second part B12 and the second color light beam B2 of the other part of the first color light beam reflected by the dichroic portion 221a are transmitted to the condensing element 260 to form the illumination light beam B55.
Although the color separation part 221a and the light splitting part 222a of the color separation element 220a are connected to each other on the opposite side surfaces in fig. 8, in other embodiments, the light splitting part may be disposed on the color separation part, and may be used to improve the color uniformity in the subsequent image formation. For example, as shown in fig. 9, the dichroic portion 222b of the dichroic element 220b is disposed on the dichroic portion 221b, and the dichroic portion 222b is located between the at least one reflective element 250 and the dichroic portion 221 b. The second portion B12 of the first color light beam has a similar propagation path as the second portion B12 of the first color light beam in fig. 8, and will not be repeated here. However, it should be noted that since the dichroic portion 222B is disposed on the dichroic portion 221B, the dichroic portion 221B can reflect all the second color light beams B2 to the light converging element 260 to form the illumination light beams B56 with the second portion B12 of the first color light beams.
In another aspect, the illumination system of the present invention can add a third color light source to provide a third color light beam to supplement the light intensity of the partial wavelength range of the second color light beam of the illumination system, thereby facilitating the adjustment of the color uniformity of subsequent images of the illumination system, as described in detail below.
Fig. 10 is a schematic view of an illumination system of another embodiment of the present invention. Referring to fig. 10, an illumination system 200f according to another embodiment of the present invention is similar to the illumination system 200 of the previous embodiment, and the main difference is that the illumination system 200f further includes a third color light source 290. Specifically, the third color light source 290 and the at least one reflection element 250 are disposed on the same side of the color separation element 220B, the third color light source 290 is used for providing a third color light beam B3, which passes through the color separation element 220B and is transmitted to the light condensation element 260, wherein the color separation element 220B can allow the first color light beam B1 and the third color light beam B3 to penetrate therethrough, and allow the second color light beam B2 to be reflected. In another embodiment, the second color light beam B2 has a first wavelength range and a second wavelength range, the first wavelength range overlaps with the wavelength range of the third color light beam B3, and the color separation element 220B is configured to reflect the second wavelength range light beam B22 of the second color light beam, so that the first wavelength range light beam B21 of the second color light beam passes through and is transmitted to the at least one reflection element 250, and is reflected by the at least one reflection element 250 back to the color separation element 220B to pass through the color separation element 220B and be transmitted to the light condensation element 260. The transmission path of the second portion B12 of the first color light beam is similar to that of fig. 1, and will not be repeated here. The second portion B12 of the first color light beam, the second color light beam B2 and the third color light beam B3 form an illumination light beam B57. Thus, the third color light beam B3 provided by the third light source 290 supplements the light intensity of the partial wavelength range of the second color light beam, thereby facilitating the adjustment of the color uniformity of the subsequent image of the illumination system. In addition, the third color light beam B3 and the first wavelength range light beam B21 of the present embodiment are red light beams, the second color light beam B2 is a yellow light beam, the second wavelength range light beam B22 is a green light beam, and the first color light beam B1 is a blue light beam, but not limited thereto.
On the other hand, although the illumination system 200f of fig. 10 is exemplified by the optical design structure of the third color light source 290 and the color separation element 220b, in other embodiments, the third color light source can also be combined with the optical design structure of the illumination system of fig. 8, that is, the color separation element includes a color separation portion and a light splitting portion, so as to facilitate adjusting the color uniformity of the subsequent image formation of the illumination system.
For example, as shown in fig. 11, in an embodiment, the third color light source 290 and the at least one reflection element 250 are disposed on the same side of the color separation element 220c, the third color light source 290 is configured to provide the third color light beam B3 to the light splitting unit 222c, and a part of the third color light beam B31 penetrates through the light splitting unit 222c and is transmitted to the light condensing element 260. The other part of the third color light beam B32 is reflected by the splitting part 222c and transmitted to the at least one reflecting element 250, and then reflected by the at least one reflecting element 250, so that the other part of the third color light beam B32 passes through the splitting part 221c to be reflected, and further transmitted to the light condensing element 260. In addition, the second portion B12 of the first color light beam is similar to the transmission path of fig. 8, and will not be repeated here. Thus, the second portion B12 of the first color light beam, the second color light beam B2 and the third color light beam B3 form the illumination light beam B58. In addition, in an embodiment, the configuration of the color separation element 220c may also adopt a design similar to that shown in fig. 9, and has a similar fill-in effect.
In addition, referring back to fig. 2 and fig. 4, if the color point of the first color light (e.g., blue light) is obvious when the illumination system 200 is applied to the projection apparatus, the problem can be improved by changing the design of the phosphor color wheel 240 in the illumination system 200. For example, the phosphor wheel 240a further has a light wavelength conversion layer 244 disposed on the reflection portion 242 and covering a part of the reflection portion 242, the light wavelength conversion layer 244 is used for converting the second part B12 of the first color light beam B1 into a fourth color light beam, and the fourth color light beam is reflected by the phosphor wheel 240a to the color separation element and reflected by the color separation element to the light collection element. Specifically, the light wavelength conversion layer 244 has a phosphor, and the phosphor is a green phosphor, but not limited thereto. The light wavelength conversion layer 244 can convert a part of the second portion of the first color light beam passing through the first lens group into a fourth color light beam, and the wavelength range of the first color light beam includes the wavelength range of the fourth color light beam. Thus contributing to improving the apparent problem of the color point of the first color light (e.g., blue light). In addition, the light wavelength conversion layer 244 is, for example, a thin film, and the phosphor is dispersed in the light wavelength conversion layer 244, so that a part of the light beam of the second portion of the first color light beam can still be reflected back to the dichroic element, and another part of the light beam is converted into a fourth color light beam.
Fig. 12 is a schematic view of a projection apparatus according to an embodiment of the invention. Referring to fig. 11, the projection apparatus 300 of the present embodiment includes a light valve 320, a projection lens 330, and an illumination system 310. The light valve 320 is disposed on a transmission path of the illumination beam Bi provided by the illumination system 310 to convert the illumination beam Bi into an image beam Bm, and the projection lens 330 is disposed on the transmission path of the image beam Bm to project the image beam Bm on a screen (not shown), thereby forming an image on the screen. The illumination system 310 may be any one of the above-mentioned embodiments, such as the illumination systems 200, 200a, 200b, 200c, 200d, 200e, 200f, or 200 g. In addition, although one light valve 320 is illustrated in fig. 12, in other embodiments, the number of the light valves 320 may be multiple. In addition, the light valve 320 of the present embodiment is, for example, a reflective light valve, such as a DMD or a Liquid Crystal on Silicon (LCoS) Panel. A reflection element 311 may be disposed on the transmission path of the illumination beam Bi to reflect the illumination beam Bi to the light valve 320, but the illumination beam Bi may also be irradiated on the light valve 320 through other optical elements. In other embodiments, the light valve 320 may also be a transmissive light valve (e.g., a transmissive liquid crystal panel), but the type and the arrangement position of the optical elements need to be adjusted appropriately.
In summary, in the illumination system according to the embodiment of the invention, the dichroic element, the first lens group and the at least one reflective element are disposed on the transmission path of the first color light beam, and the first lens group transmits the first color light beam provided by the laser source group to the optical wavelength conversion portion and the reflective portion of the phosphor wheel, so that the second color light beam reflected by the optical wavelength conversion portion is reflected to the light collecting element through the dichroic element, the second portion of the first color light beam reflected by the reflective portion is transmitted to the at least one reflective element through the dichroic element after being reflected back to the dichroic element, and the second portion of the first color light beam is reflected back to the dichroic element through the at least one reflective element and transmitted to the light collecting element as the illumination light beam. Compared with the prior art, the illumination system of the embodiment of the invention uses fewer optical elements, so that the complex light path can be simplified, and the volume of the illumination system and the projection device using the illumination system can be reduced.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents. Moreover, not all objects or advantages or features disclosed herein are necessarily achieved by any one embodiment or claim of the invention. In addition, the abstract and the title of the specification are provided for assisting the retrieval of patent documents and are not intended to limit the scope of the present invention. Furthermore, the terms "first," "second," and the like in the description and in the claims are used for naming elements (elements) or distinguishing between different embodiments or ranges, and are not intended to limit the upper or lower limit on the number of elements.
List of reference numerals
100. 200, 200a, 200b, 200c, 200d, 200e, 200f, 200g, 310: lighting system
110: laser light source module
112: blue light beam
113: green beam
114: yellow light beam
122: collimating element
123. 124, 126, 127, 128, 129, 2121, 2122, 231, 232: lens and lens assembly
130: color separation sheet
140. 240, 240 a: fluorescent powder rotating wheel
141: back side of the panel
150. 280, 280 a: color wheel with filter
161. 162, 163, 250, 251, 252: reflective element
170. 270: light integration rod
210: excitation light source set
211: excitation light source
2111: surface of
212: second lens group
220. 220a, 220b, 220 c: color separation element
221. 221a, 221b, 221 c: color separation section
222. 222a, 222b, 222 c: light splitting part
230: first lens group
241: optical wavelength conversion unit
242: reflection part
243: rotary disc
244: optical wavelength conversion layer
260: light-gathering element
281: light filter part
282: light transmission part
283: microprism structure
290: third color light source
300: projection device
320: light valve
330: projection lens
A1: first optical axis
A2: second optical axis
A3: optical axis
B1, B11, B12: first color light beam
B2, B21, B22: the second color light beam
B3, B31, B32: third color light beam
B51, B52, B53, B54, B55, B56, B57, B58, Bi: illuminating light beam
Bm: image light beam
D1, D2: distance between two adjacent plates
N1, N2: center shaft
O: center position
Claims (13)
1. An illumination system, comprising an excitation light source set, a color separation element, a first lens set, a phosphor wheel, at least one reflection element and a light-condensing element,
the excitation light source group is provided with a first optical axis and is used for providing a first color light beam;
the color separation element is configured on a transmission path of the first color light beam, and the color separation element is used for enabling the first color light beam to pass through;
the first lens group is arranged on one side of the color separation element far away from the laser source group and is used for enabling the first color light beam passing through the color separation element to pass through and obliquely enter the fluorescent powder rotating wheel, and the first lens group is provided with a second optical axis, wherein the second optical axis and the first optical axis are not coaxial with each other;
the phosphor wheel is disposed on a side of the first lens group away from the dichroic element, the phosphor wheel having a light wavelength conversion portion and a reflection portion, the light wavelength conversion portion being configured to convert a first portion of the first color light beam passing through the first lens group into a second color light beam and reflect the second color light beam back to the dichroic element, the reflection portion being configured to reflect a second portion of the first color light beam passing through the first lens group back to the dichroic element, the dichroic element being configured to reflect the second color light beam and pass at least a portion of the second portion of the first color light beam;
the at least one reflecting element is arranged on one side of the color separation element, which is adjacent to the laser light source group, and is separated from the color separation element by a distance, and the at least one reflecting element is used for reflecting the second part of the first color light beam passing through the color separation element so that the second part of the first color light beam passes through the color separation element again;
the condensing element is disposed on a side of the color separation element adjacent to the first lens group, and the condensing element is configured to pass through the second portion of the first color light beam reflected by the at least one reflection element and the second color light beam reflected by the color separation element.
2. The illumination system of claim 1, wherein the excitation light source set comprises an excitation light source and a second lens set, a surface of the excitation light source facing the second lens set has a central axis, the second lens set has the first optical axis, and the central axis and the first optical axis are coaxial with each other.
3. The illumination system of claim 1, wherein the excitation light source set comprises an excitation light source and a second lens set, a surface of the excitation light source facing the second lens set has a central axis, the second lens set has the first optical axis, and the central axis and the first optical axis are not coaxial with each other.
4. The illumination system of claim 1, wherein the dichroic element is a dichroic mirror, and wherein the first color light beam from the set of laser sources and the second color light beam reflected from the phosphor wheel and the second portion of the first color light beam are both passed to the dichroic element, the dichroic element configured to pass the first color light beam and reflect the second color light beam.
5. The illumination system as recited in claim 4, further comprising a third color light source disposed on a same side of the dichroic element as the at least one reflective element, the third color light source for providing a third color light beam that passes through the dichroic element to the condensing element.
6. The illumination system of claim 1, wherein the dichroic element has a dichroic portion and a splitting portion, the color separation part and the light splitting part are adjacent to each other, the color separation part is positioned on a transmission path of the first color light beam from the laser source group, the light splitting part is positioned on a transmission path of the second part of the first color light beam reflected from the fluorescent powder rotating wheel, the second color light beam is reflected to the color separation part and the light splitting part by the fluorescent powder rotating wheel, the color separation part is used for enabling the first color light beam to pass through, and reflects the second color light beam, the light splitting part is used for enabling at least one part of the second part of the first color light beam to penetrate and transmit to the at least one reflecting element, the light splitting part is used for reflecting the second part of the first color light beam and the second color light beam of the other part and transmitting the second color light beam to the light condensing element.
7. The illumination system of claim 1, further comprising a third color light source, wherein the color separation element has a color separation portion and a light splitting portion, the color separation portion and the light splitting portion are adjacent to each other, the color separation portion is located on a transmission path of the first color light beam from the laser light source set, the light splitting portion is located on a transmission path of the second portion of the first color light beam reflected from the phosphor wheel, the third color light source and the at least one reflection element are disposed on the same side of the color separation element, the third color light source is configured to provide a third color light beam to the light splitting portion, and a portion of the third color light beam passes through the light splitting portion and is transmitted to the light collecting element.
8. The illumination system of claim 1, wherein said at least one reflective element has two mirrors that sequentially reflect said second portion of said first color light beam passing through said dichroic element.
9. The illumination system of claim 1, wherein the phosphor wheel further has a light wavelength conversion layer disposed on and covering the reflective portion, the light wavelength conversion layer for converting a portion of the second portion of the first color light beam into a fourth color light beam, the fourth color light beam being reflected by the phosphor wheel to the dichroic element and reflected by the dichroic element to the condensing element.
10. The illumination system of claim 1, further comprising a light integrating rod and a color filter wheel, the color filter wheel being disposed between the light integrating rod and the light focusing element.
11. The illumination system according to claim 10, wherein a central axis of the light integration rod and an optical axis of the condensing element are coaxial with each other, and a geometric center of the at least one reflecting element is located on an extension line of the central axis of the light integration rod.
12. The illumination system of claim 11, wherein the color filter wheel has at least one filter portion and a light-transmitting portion, the at least one filter portion provides light of the second color beam therethrough, the light-transmitting portion provides light of the second color beam therethrough, and the light-transmitting portion has a micro-prism structure to refract the light of the second color beam.
13. A projection apparatus comprising an illumination system as claimed in any of claims 1 to 12, a light valve and a projection lens,
the illumination system is used for providing an illumination light beam;
the light valve is configured on a transmission path of the illumination light beam provided by the illumination system so as to convert the illumination light beam into an image light beam;
the projection lens is configured on the transmission path of the image light beam.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710879277.XA CN109557750B (en) | 2017-09-26 | 2017-09-26 | Illumination system and projection apparatus using the same |
| TW106137826A TWI639035B (en) | 2017-09-26 | 2017-11-01 | Illumination system and projection apparatus using the same |
| US15/863,999 US10732495B2 (en) | 2014-05-02 | 2018-01-08 | Illumination system, projection apparatus and method for driving illumination system |
| JP2018170142A JP7193280B2 (en) | 2017-09-26 | 2018-09-12 | Illumination system and projection device using the illumination system |
| US16/656,543 US10962871B2 (en) | 2014-05-02 | 2019-10-17 | Light source module and projection apparatus |
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| CN201710879277.XA CN109557750B (en) | 2017-09-26 | 2017-09-26 | Illumination system and projection apparatus using the same |
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| CN109557750A CN109557750A (en) | 2019-04-02 |
| CN109557750B true CN109557750B (en) | 2021-06-15 |
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| CN201710879277.XA Active CN109557750B (en) | 2014-05-02 | 2017-09-26 | Illumination system and projection apparatus using the same |
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| JP (1) | JP7193280B2 (en) |
| CN (1) | CN109557750B (en) |
| TW (1) | TWI639035B (en) |
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| TW201915535A (en) | 2019-04-16 |
| TWI639035B (en) | 2018-10-21 |
| JP7193280B2 (en) | 2022-12-20 |
| JP2019061237A (en) | 2019-04-18 |
| CN109557750A (en) | 2019-04-02 |
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