TW201915535A - Illumination system and projection apparatus using the same - Google Patents

Abstract

An illumination system including an excitation light source group, a dichroic element, a first lens group, a phosphor wheel, at least one reflective element and a light condenser element is provided. The excitation light source group is configured to generate a first color light beam. The first color light beam sequentially passes through the dichroic element and the first lens group, and then transmits to the phosphor wheel. A first portion of the first color light beam is converted into a second color light beam by a light wavelength conversion portion of the phosphor wheel. The second color light beam is reflected back to the dichroic element by the light wavelength conversion portion. And then, the second color light beam is reflected back to the light condenser element by the dichroic element. A second portion of the first color light beam is reflected back to the dichroic element by a reflection portion of the phosphor wheel. And then, the second portion of the first color light beam passes through the dichroic element and transmits to the at least one reflective element. Afterward, the second portion of the first color light beam is reflected by the at least one reflective element and passes through the dichroic element for transmission to the light condenser element. A projection apparatus having the illumination system is also provided.

Description

Lighting system and projection device using the same

The present invention relates to a light source module, and more particularly, to a lighting system and a projection device using the same.

A digital light processing (DLP) projection device includes an illumination system, a digital micro-mirror device (DMD), and a projection lens. The illumination system is used to provide an illumination beam, and the digital micro-mirror device is used to The illumination beam is converted into an image beam, and the projection lens is used to project the image beam on the screen to form an image on the screen. Ultra-high pressure mercury lamps are a light source often used in early lighting systems, which can provide white light as an illumination beam. With the development of lighting technology, light emitting diode light sources, laser light sources (laser diodes) and other light sources with energy saving advantages have also been gradually adopted.

FIG. 1 is a schematic diagram of a conventional lighting system using a laser light source. Referring to FIG. 1, in a conventional lighting system 100, a blue light beam 112 provided by a laser light source module 110 passes through a collimating element 122, passes through a dichroic mirror 130, and then passes through lenses 123 and 124 to irradiate. On a rotatable phosphor wheel 140. The phosphor wheel 140 can be divided into a green phosphor region, a yellow phosphor region, a transparent zone, and the like. The green phosphor region and the yellow phosphor region of the phosphor wheel 140 are different. A reflective element (not shown) is provided on the back surface 141 of the area. The blue light beam 112 will sequentially illuminate the green phosphor area, the yellow phosphor area, and the light transmission area. When the blue light beam 112 is irradiated on the green phosphor area and the yellow phosphor area, the green light beam 113 will be excited. And yellow light beam 114, and the reflecting element reflects the green light beam 113 and the yellow light beam 114 to the dichroic sheet 130, and then the green light beam 113 and the yellow light beam 114 are reflected by the dichroic sheet 130 and passed through the lens 125 to illuminate In the rotatable filter wheel 150. In addition, a part of the blue light beam 112 passes through the light transmission area, and passes through the lenses 126, 127, the reflective elements 161, 162, the lens 128, the reflective element 163, the lens 129, the dichroic sheet 130, and the lens 125 in order and is then irradiated on Filter color wheel 150.

Following the above, the filter color wheel 150 has a red light filter area and a transparent area corresponding to a part of the yellow phosphor area, a green light filter area corresponding to the green phosphor area, and a light transmission area. Diffusion zone. By controlling the filter color wheel 150 and the phosphor wheel 140 to rotate in cooperation with each other, the green light beam 113 is irradiated on the green light filter region, the yellow light beam 114 is irradiated on the red light filter region and the transparent region, and the blue light beam 112 Irradiate the diffusion area. In this way, the light beams that pass through the filter color wheel 150 and enter the light integration column 170 (rod) include a blue light beam, a green light beam, a red light beam, and a yellow light beam for improving the brightness.

Since the conventional lighting system 100 has a complicated architecture and requires many optical components, it has the disadvantages of high cost, large volume, and poor optical efficiency.

This "prior art" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "prior art" may include some conventional technologies that do not constitute the ordinary knowledge of those skilled in the art. In addition, the content disclosed in the "prior art" does not represent the content or the problem to be solved by one or more embodiments of the present invention, nor does it mean that prior to the application of the present invention, it has been used by those with ordinary knowledge in the technical field to which it belongs. Know or know.

The invention proposes a lighting system to simplify a complicated light path, thereby reducing the volume.

The invention provides a projection device, which has the advantage of smaller volume.

Other objects and advantages of the present invention can be further understood from the technical features disclosed by the present invention.

In order to achieve one or some or all of the above or other purposes, an embodiment of the present invention provides an illumination system including an excitation light source group, a dichroic element, a first lens group, a phosphor wheel, and at least one reflective element. With condenser element. The excitation light source group has a first optical axis, and the excitation light source group is used to provide a first color light beam. The color separation element is disposed on the transmission path of the first color light beam, and the color separation element is used to pass the first color light beam. The first lens group is disposed on a side of the dichroic element away from the excitation light source group, and is used for passing the first color light beam passing through the first lens. The first lens group has a second optical axis, and the second optical axis and The first optical axes are not coaxial with each other. The phosphor wheel is disposed on the side of the first lens group away from the dichroic element. The phosphor wheel has a light wavelength conversion section and a reflection section. The light wavelength conversion section is used to pass the first color passing through the first lens group. The first part of the light beam is converted into a second-color light beam and reflects the second-color light beam back to the dichroic element. The reflection portion is configured to reflect the second part of the first-color light beam that has passed through the first lens group back to the dichroic element. It is used for reflecting the second color light beam and passing the second part of the first color light beam. At least one reflective element is disposed on a side of the color separation element adjacent to the excitation light source group and is separated from the color separation element. The at least one reflection element is used to reflect the second part of the first color light beam passing through the color separation element, so that the first The second part of the one-color beam passes through the dichroic element again. The light condensing element is disposed on a side of the dichroic element adjacent to the first lens group, and the light condensing element is used to pass 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 through Too.

In an embodiment of the present invention, the above-mentioned excitation light source group includes an excitation light source and a second lens group, a surface of the excitation light source facing the second lens group has a central axis, the second lens group has a first optical axis, and the central axis Coaxial with the first optical axis.

In an embodiment of the present invention, the above-mentioned excitation light source group includes an excitation light source and a second lens group, a surface of the excitation light source facing the second lens group has a central axis, the second lens group has a first optical axis, and the central axis Not coaxial with the first optical axis.

In an embodiment of the present invention, the above-mentioned color separation element is a color separation element, the first color light beam from the excitation light source group and the second color light beam reflected from the phosphor wheel and the second part of the first color light beam. Both are passed to the color separation element, which is used to pass the first color light beam and reflect the second color light beam.

In an embodiment of the present invention, the above-mentioned lighting system further includes a third color light source, which is arranged on the same side as the at least one reflective element. The third color light source is used to provide a third color light beam and pass through the color separation element. And passed to the light collecting element.

In an embodiment of the present invention, the color separation element has a color separation part and a light separation part, the color separation part and the light separation part are adjacent to each other, and the color separation part is located on a transmission path of the first color light beam from the excitation light source group, The spectroscopic part is located on the transmission path of the second part of the first color light beam reflected from the phosphor wheel. The second color light beam is reflected by the phosphor wheel to the color separation part and the light separation part. The light beam of one color passes through and reflects the light beam of the second color. The beam splitting portion is used for transmitting and transmitting the second part of the light beam of the first color and the light beam of the second color to at least one reflecting element. The second-color light beam is partially reflected and transmitted to the light collecting element.

In an embodiment of the present invention, the above-mentioned lighting system further includes a third color light source, and the color separation element has a color separation part and a light separation part, the color separation part and the light separation part are adjacent to each other, and the color separation Part is located on the transmission path of the first color light beam from the excitation light source group, the light splitting part is located on the transmission path of the second part of the first color light beam reflected from the phosphor wheel, and the third color The light source and the at least one reflective element are arranged on the same side of the dichroic element. The third-color light source is used to provide a third-color light beam to the spectroscopic portion, and a portion of the third-color light beam penetrates the spectroscopic portion and is transmitted to the light-concentrating element.

In an embodiment of the present invention, the at least one reflecting element has two reflecting mirrors, and these reflecting mirrors sequentially reflect the second portion of the first color light beam passing through the color separation element.

In an embodiment of the present invention, the phosphor wheel further includes a light wavelength conversion layer, which is disposed on the reflection portion and covers a portion of the reflection portion. The light wavelength conversion layer is used to convert the second portion of the first color light beam. It is partially converted into a fourth-color light beam, which is reflected by the phosphor wheel to the color separation element, and is reflected by the color separation element to the light-concentration element.

In an embodiment of the present invention, the above-mentioned lighting system further includes a light integration post and a filter color wheel, and the filter color wheel is disposed between the light integration post and the light collecting element.

In an embodiment of the present invention, the central axis of the light integrating column and the optical axis of the light concentrating element are coaxial with each other, and the geometric center of the at least one reflecting element is located on an extension line of the central axis of the light integrating column.

In an embodiment of the present invention, the above-mentioned filter color wheel has at least one filter portion and a light transmission portion, at least one filter portion provides penetration of the second color light beam, and the light transmission portion provides the first color light beam. The second part penetrates, and the light transmitting part is provided with a micro chirp structure to refract the second part of the first color light beam.

In order to achieve one or a part or all of the foregoing or other objectives, an embodiment of the present invention provides a projection device including the above-mentioned illumination system, a light valve, and a projection lens. The lighting system is used to provide an illumination beam. The light valve is disposed on a transmission path of the illumination beam provided by the illumination system, so as to convert the illumination beam into an image beam. The projection lens is disposed on a transmission path of the image beam.

In the lighting system according to the embodiment of the present invention, a color separation element, a first lens group, and at least one reflection element are provided on a transmission path of the first color light beam. The first color light beam provided by the light source group is excited by the first lens group. The light wavelength conversion section and reflection section transmitted to the phosphor runner, so after the second color light beam reflected by the light wavelength conversion section and the second part of the first color light beam reflected by the reflection section are reflected back to the dichroic element and transmitted through The color separation element reflects the second color light beam, and reflects at least one reflection element to reflect the second part of the first color light beam passing through the color separation element back to the color separation element, so that the second part of the first color light beam and the second color The light beam is transmitted to the light collecting element along the same path to form an illumination light beam. Compared with the conventional technology, the illumination system of the embodiment of the present invention uses fewer optical elements, so it can simplify a complicated light path, and can reduce the volume of the illumination system and the projection device using the illumination system.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, embodiments are described below in detail with reference to the accompanying drawings, as follows.

The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, or rear, are only directions referring to the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

FIG. 2 is a schematic diagram of an illumination system according to an embodiment of the present invention, and FIG. 3 is a schematic front view of the phosphor wheel of FIG. 2. Please refer to FIG. 2 and FIG. 3. The illumination system 200 of this embodiment includes an excitation light source group 210, a color separation element 220, a first lens group 230, a phosphor wheel 240, and at least one reflective element 250 (FIG. The mirror is an example) and the light-concentrating element 260. The excitation light source group 210 has a first optical axis A1, and the excitation light source group 210 is used to provide a first color light beam B1. The color separation element 220 is disposed on the transmission path of the first color light beam B1, and the color separation element 220 is used for passing the first color light beam B1. The first lens group 230 is disposed on a side of the dichroic element 220 away from the excitation light source group 210. In other words, the first lens group 230 and the excitation light source group 210 are disposed on opposite sides of the dichroic element 220, respectively. The first color light beam B1 passing through the dichroic element 220 passes through. The first lens group 230 has a second optical axis A2. The second optical axis A2 and the first optical axis A1 are not coaxial with each other. The so-called optical axis is defined as optical The direction of the component's main ray. The phosphor wheel 240 is disposed on the side of the first lens group 230 away from the color separation element 220. In other words, the phosphor wheel 240 and the color separation element 220 are disposed on opposite sides of the first lens group 230, respectively. The phosphor runner 240 includes a light wavelength conversion portion 241 and a reflection portion 242. The light wavelength conversion portion 241 is configured to convert a first portion B11 of the first color light beam B1 passing through the first lens group 230 into a second color light beam B2 and The second color light beam B2 is reflected back to the dichroic element 220, and the reflection portion 242 is used to reflect the second portion B12 of the first color light beam B1 passing through the first lens group 230 back to the dichroic element 220, and the dichroic element 220 is further used for reflection The second color light beam B2 passes 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 excitation light source group 210 and is separated from the color separation element 220 by a distance D1. The reflection element 250 is used to reflect the second part of the first color light beam passing through the color separation element 220. B12, so that the second part B12 of the first color light beam passes through the dichroic element 220 again. The light condensing element 260 is disposed on a side of the dichroic element 220 adjacent to the first lens group 230. The light condensing element 260 is configured to reflect the second portion B12 of the first color light beam B1 reflected by the reflective element 250 and the dichroic element 220. The second color light beam B2 passes through.

The excitation light source group 210 in this embodiment is exemplified by including an excitation light source 211 and a second lens group 212. The excitation light source 211 includes, for example, a plurality of laser elements (not shown). These laser elements are arranged in an array, for example. The radiation element is, for example, a laser diode (LD). In addition, in other embodiments, there may be one laser element for the excitation light source 211. In addition, the excitation light source 211 of the present invention is not limited to a laser element, and an appropriate light source may be selected according to design requirements, for example, a light-emitting diode (LED).

Further, the 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 and the first optical axis A1 of the excitation light source 211 are coaxial with each other. However, the present invention is not limited to this. The central axis N1 and the first optical axis A1 of the excitation light source 211 may not be coaxial with each other, and the position of the excitation light source 211 may be adjusted according to design requirements. In an embodiment, the central axis N1 of the excitation light source 211 is, for example, parallel to the first optical axis A1, and the central axis N1 is, for example, a distance (not shown) from the first optical axis A1. This distance may be 0.2 mm, but The invention is not limited to this.

The dichroic element 220 in this embodiment is, for example, a Dichroic mirror, which is suitable for separating at least two beams with different wavelength ranges, but is not limited thereto, so that each beam is transmitted along different paths. Specifically, the dichroic element 220 is used to pass the first color light beam B1 from the excitation light source group 210 and reflect the second color light beam B2 from the phosphor wheel 240.

The first lens group 230 in this embodiment includes, for example, two lenses 231 and 232. The lens 231 is disposed between the dichroic element 220 and the lens 232. The lenses 231 and 232 have a central axis, and the second optical axis A2 is This 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 group 210, and the second optical axis A2 has a distance D2 from the first optical axis A1, for example. In an embodiment, the distance D2 may be 5.5 mm, but the present invention is not limited thereto.

The phosphor wheel 240 of this embodiment includes, for example, a turntable 243 and a motor (not shown) that drives the turntable 243 to rotate, and the light wavelength conversion portion 241 and the reflection portion 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 section 241 is, for example, a phosphor layer disposed on the turntable 243. The phosphor is, for example, a yellow phosphor, but is not limited thereto. In other embodiments, the phosphor layer may also include a phosphor layer that can excite two colors, such as a phosphor that excites a yellow light beam. Light powder and fluorescent powder which can excite green light beam. The first part B11 of the first light beam B1 refers to the first light beam B1 irradiated on the light wavelength conversion section 241, and the second part B12 of the first light beam B1 refers to the first light beam B1 irradiated on the reflection section 242. When the motor-driven turntable 243 rotates, the first color light beam B1 provided by the excitation light source group 210 irradiates the light wavelength conversion part 241 and the reflection part 242 in turn, so that the first part B11 of the first color light beam B1 excites phosphor and is generated. 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 is reflected back to the dichroic element 220. In this embodiment, the first color light beam B1 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 it is not limited thereto.

The reflecting element 250 in this embodiment is an example of 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 to this, and the number of the reflective elements 250 may be plural.

Based on the light path design architecture of the illumination system 200 described above, the first color light beam B1 provided by the excitation light source group 210 passes through the dichroic element 220 and the first lens group 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 will be refracted by the first lens group 230 and the first color light beam B1 will be incident obliquely onto the phosphor wheel 240. After being reflected by the phosphor wheel 240, the phosphor wheel 240 is transmitted through a path different from that when incident. In detail, the first part B11 of the first color light beam B1 is irradiated on the light wavelength conversion section 241 of the phosphor wheel 240 to excite the second color light beam B2, and the second color light beam B2 is reflected by the turntable 243, and the second color The light beam B2 is transmitted to the dichroic element 220 through the first lens group 230. The second color light beam B2 is reflected by the dichroic element 220 to be transmitted to the light condensing element 260. On the other hand, the second portion B12 of the first color light beam B1 is irradiated on the reflection portion 242 of the phosphor wheel 240 and is reflected by the reflection portion 242 and passes through the first lens group 230 and the color separation element 220 to be transmitted to The reflective element 250 is further reflected by the reflective element 250 and passes through the dichroic element 220 again and is transmitted to the condensing element 260. Therefore, the second part B12 of the first color light beam B1 and the second color light beam B2 can be transmitted to the condensing element along the same path. Light element 260.

As such, the illumination system 200 according to the embodiment of the present invention is provided with a dichroic element 220, a first lens group 230, and at least one reflective element 250 on the transmission path of the first color light beam B1, and the excitation light source is transmitted through the first lens group 230. The first color light beam B1 provided by the group 210 is transmitted to the light wavelength conversion part 241 and the reflection part 242 of the phosphor wheel 240, so the second color light beam B2 reflected by the light wavelength conversion part 241 and the reflection part 242 are reflected. After the second portion B12 of the first color light beam B1 is reflected back to the color separation element 220, the second color light beam B2 is reflected through the color separation element 220, and the first color light beam B1 passing through the color separation element 220 is transmitted through the reflection element 250. The two parts B12 are reflected back to the dichroic element 220, 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. Therefore, the lighting system 200 according to the embodiment of the present invention can simplify a complicated light path and reduce the volume of the overall lighting system.

In addition, the lighting system 200 of this embodiment may further include a light integration post 270 and a filter color wheel 280. The filter color wheel 280 is disposed between the light integration post 270 and the light collecting element 260. With the rotation of the filter color wheel 280, the second portion B12 of the first color beam B1 and the second color beam B2 can be divided into a plurality of sub-beams of different colors, such as a red sub-beam, a green sub-beam, and a blue sub-beam.

When the above-mentioned lighting system 200 is applied to a projection device, if there is a problem that the color point of the first color light (such as blue light) is obvious during imaging, the design of the fluorescent pink wheel 240 in the lighting system 200 can be improved. For example, as shown in FIG. 4, the phosphor runner 240a further includes a light wavelength conversion layer 244, which is disposed on the reflection portion 242 and covers a part of the reflection portion 242. The light wavelength conversion layer 244 is used to convert the first wavelength of the first color light beam B1. The second part B12 is converted into a third color light beam, which is reflected by the phosphor wheel 240a to the color separation element, and is 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 it is not limited thereto. The light wavelength conversion layer 244 can partially convert 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. Therefore, it helps to improve the problem that the color point of the first color light (such as blue light) is obvious. 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 part of the first color light beam can still be reflected back to the dichroic element, and the other part of the light beam is converted into The third color beam.

On the other hand, the present invention can also adjust the light path design structure of the lighting system. When the second part B12 of the first color light beam B1 is transmitted to the light integration post 270, the reflection element 250 makes the first color light beam B1 The included angle between the main ray direction of the second part B12 and the central axis N2 of the light integration post 270 becomes smaller, and the color uniformity during subsequent imaging is improved, as described in detail below.

FIG. 5 is a schematic diagram of a lighting system according to another embodiment of the present invention. Please refer to FIG. 5, a lighting system 200a according to another embodiment of the present invention. The lighting system 200a of this embodiment is similar to the lighting system 200 of the previous embodiment. The main difference is that the number of reflecting elements of the lighting system 200a of this embodiment is The two elements, namely, the reflection elements 251 and 252, are, for example, reflectors, for sequentially reflecting the second portion B12 of the first color light beam B1 passing through the color separation element 220, so that the first color light beam B1 can be made. The second part B12 of the light beam returns to the color separation element 220 again, so that the second color light beam B2 and the second part B12 of the first color light beam B1 are transmitted to the light collecting element 260 to form the illumination light beam B52. Therefore, the reflecting elements 251 and 252 help to reduce the angle between the main beam direction of the second portion B12 of the first color light beam B1 and the central axis N2 of the light integration post 270, thereby improving the color uniformity in subsequent imaging. . In addition, although the reflective elements 251 and 252 in FIG. 5 have a spherical reflective surface as an example, in the present invention, the number of these reflective elements and the shape of their reflective surface can still be selected according to design requirements. For example, a reflective element with a spherical reflective surface is selected. Any number of combinations of the reflective element and the reflective element having a planar reflective surface, or the selection of reflective elements that are all planar reflective surfaces is limited here.

FIG. 6 is a schematic diagram of a lighting system according to another embodiment of the present invention. Please refer to FIG. 6. The lighting system 200b of this embodiment is similar to the lighting system 200 of the previous embodiment. The main difference is that compared to FIG. 2, the position of the reflective element 250 in this embodiment is, for example, translated to the right and closer to the color separation. Element 220. The central axis N2 of the light integrating post 270 is, for example, coaxial with the optical axis A3 of the focusing element 260, and the geometric center position O of the reflecting element 250 is, for example, located on the extension line of the central axis N2, and the first axis reflected by the reflecting element 250 The second portion B12 of the one-color light beam B1 uniformly surrounds the optical axis A3 of the condensing element 260.

FIG. 7 is a schematic diagram of a lighting system according to another embodiment of the present invention. Please refer to FIG. 7, a lighting system 200 c according to another embodiment of the present invention. The lighting system 200 c in this embodiment is similar to the lighting system 200 in the previous embodiment. The main difference lies in the structural design of the filter color wheel 280 a. Specifically, the color filter wheel 280a has at least one filter portion 281 and a light transmitting portion 282. At least one filter portion 281 provides penetration of the second color light beam B2, and the light transmitting portion 282 provides first light beam B1 of the first color. The second portion B12 penetrates, and the light transmitting portion 282 is provided with a micro chirp structure 283 to refract the second portion B12 of the first color light beam B1. The micro chirp structure 283 has, for example, a plurality of inclined planes arranged in parallel, which can change the light exit path of the second portion B12 of the first color light beam B1 passing through each of the inclined surfaces to form an illumination light beam B54 with the second color light beam B2. It helps to make the angle between the optical axis of the second part B12 of the first color light beam B1 and the central axis N2 of the light integration post 270 smaller, and improve the color uniformity in subsequent imaging. However, the present invention is not limited to the shape of the micro-condyle structure 283 in FIG. 7, and can be adjusted according to design requirements.

FIG. 8 is a schematic diagram of a lighting system according to another embodiment of the present invention. Please refer to FIG. 8, a lighting system 200 d according to another embodiment of the present invention. The lighting system 200 d of this embodiment is similar to the lighting system 200 of the previous embodiment. The main difference is that the structure of the color separation element 220 a is different. Specifically, the dichroic element 220a has, for example, a dichroic portion 221a and a dichroic portion 222a, and the dichroic portion 221a and the dichroic portion 222a are adjacent to each other. For example, the dichroic portion 221a and the dichroic portion 222a are combined in a bonding manner, but this is not the case. Limited. The color separation part 221a is located on the transmission path of the first color light beam B1 from the excitation light source group 210, and the light separation part 222a is located on the transmission path of the second part B12 of the first color light beam reflected from the phosphor wheel 240. The color light beam B2 is reflected by the phosphor wheel 240 to the color separation portion 221a and the light separation portion 222a. The color separation section 221a is configured to pass the first color light beam B1 and reflect the second color light beam B2. The beam splitting portion 222a is used to transmit a second portion B12 of the first color light beam of one portion and transmit to the at least one reflective element 250, and the beam splitting portion 222a is used to reflect the second portion B12 and the first portion of the first color light beam B1 of the other portion. The two-color light beam B2 is transmitted to the light collecting element 260. The second portion B12 of the part of the first color light beam reflected by the at least one reflecting element 250 is transmitted to the light collecting element 260 through the color separation portion 221a, and the second portion B12 of the other part of the first color light beam reflected by the color separation portion 221a. And the second color light beam B2 is transmitted to the light collecting element 260 to form an illumination light beam B55.

In addition, although the color separation portion 221a and the light separation portion 222a of the color separation element 220a in FIG. 8 are connected to opposite sides as an example, in other embodiments, the light separation portion may be disposed on the color separation portion and can also be used for Improve color uniformity in subsequent imaging. For example, as shown in FIG. 9, the light separation portion 222 b of the color separation element 220 b is disposed on the color separation portion 221 b, and the light separation portion 222 b is located between at least one reflection element 250 and the color separation portion 221 b. The second portion B12 of the first color light beam has a transmission path similar to that of the second portion B12 of the first color light beam in FIG. 8, and is not repeated here. It should be mentioned that, because the beam splitting section 222b can be disposed on the color separating section 221b, the color splitting section 221b can reflect the second color light beam B2 to the focusing element 260, so as to be the same as the second portion of the first color light beam. B12 forms an illumination beam B56.

On the other hand, the illumination system of the present invention can add a third-color light source to provide a third-color light beam, which supplements the light intensity of a part of the wavelength range of the second-color light beam of the illumination system, and helps to adjust the uniform color of subsequent imaging of the illumination system The details are as follows.

FIG. 10 is a schematic diagram of a lighting system according to another embodiment of the present invention. Please refer to FIG. 10, a lighting system 200f according to another embodiment of the present invention. The lighting system 200f of this embodiment is similar to the lighting system 200 of the previous embodiment. The main difference is that the lighting system 200f further includes a third color light source 290. Specifically, the third color light source 290 and the at least one reflective element 250 are disposed on the same side of the color separation element 220b. The third color light source 290 is used to provide a third color light beam B3, pass through the color separation element 220b, and transmit to the light collecting element. 260, where the dichroic element 220b can allow the first color beam B1 and the third color beam B3 to penetrate and reflect the second color beam B2. In another embodiment, the second color 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 beam B3, and the dichroic element 220b is configured to reflect the first wavelength range of the second color beam. The light beam B22 of the two wavelength range, and the light beam B21 of the first wavelength range of the second color light beam is transmitted to the at least one reflective element 250, and is reflected by the at least one reflective element 250 back to the color separation element 220b to pass through the color separation element. 220b is transmitted to the light collecting element 260. The transmission path of the second portion B12 of the first-color light beam is similar to that in FIG. 1, and is not repeated here. The second portion B12 of the first color beam, the second color beam B2, and the third color beam B3 can be formed into an illumination beam B57. In this way, the third-color light beam B3 provided by the third light source 290 supplements the light intensity in a part of the wavelength range of the second-color light beam, thereby helping to adjust the color uniformity of the subsequent imaging of the lighting system. In addition, the third color beam B3 and the first wavelength range beam B21 in this embodiment are red light beams, the second color beam B2 is a yellow light beam, and the second wavelength range beam B22 is a green light beam. The first color The light beam B1 is a blue light beam, but is not limited thereto.

On the other hand, although the lighting system 200f of FIG. 10 is based on the optical design architecture of the third color light source 290 and the color separation element 220b as an example, in other embodiments, the third color light source may also be combined with the lighting system of FIG. 8. The optical design architecture, that is, the dichroic element includes a dichroic part and a spectroscopic part, which helps to adjust the color uniformity of the subsequent imaging of the lighting system.

For example, as shown in FIG. 11, in an embodiment, the third color light source 290 and at least one reflective element 250 are disposed on the same side of the color separation element 220 c. The third color light source 290 is configured to provide a third color light beam. From B3 to the spectroscopic portion 222c, a part of the third color light beam B31 passes through the spectroscopic portion 222c and is transmitted to the light collecting element 260. The other part of the third color light beam B32 is reflected by the spectroscopic portion 222c and transmitted to at least one reflective element 250. The other part of the third color light beam B32 is reflected by the at least one reflective element 250 through the color separation portion 221c, and then transmitted to the condenser Light 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. In this way, the second portion B12 of the first color beam, the second color beam B2, and the third color beam B3 form an 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 of FIG. 9 and have a similar light supplement effect.

In addition, referring back to FIG. 2 and FIG. 4, when the above-mentioned lighting system 200 is applied to a projection device, if there is a problem that the color point of the first color light (such as blue light) is obvious during imaging, the fluorescent light in the lighting system 200 may be changed. The design of the light pink wheel 240 is improved. For example, the phosphor runner 240a further includes a light wavelength conversion layer 244, which is disposed on the reflection portion 242 and covers a portion of the reflection portion 242. The light wavelength conversion layer 244 is used to convert the second portion B12 of the first color light beam B1 into a first light beam B1. The four-color light beam is reflected by the phosphor wheel 240a to the color separation element, and is 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 it is not limited thereto. The light wavelength conversion layer 244 can partially convert 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. Therefore, it helps to improve the problem that the color point of the first color light (such as blue light) is obvious. 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 part of the first color light beam can still be reflected back to the dichroic element, and the other part of the light beam is converted into The fourth color beam.

FIG. 12 is a schematic diagram of a projection apparatus according to an embodiment of the invention. Please refer to FIG. 11, the projection apparatus 300 in this embodiment includes a light valve 320, a projection lens 330 and an illumination system 310. The light valve 320 is disposed on the transmission path of the illumination beam Bi provided by the illumination system 310 to convert the illumination beam Bi into the image beam Bm. The projection lens 330 is disposed on the transmission path of the image beam Bm to project the image beam Bm on The screen (not shown) forms an image on the screen. The lighting system 310 may be the lighting system of any of the above embodiments, such as the lighting system 200, 200a, 200b, 200c, 200d, 200e, 200f, or 200g. In addition, although one light valve 320 is taken as an example in FIG. 12, in other embodiments, the number of the light valves 320 may be plural. In addition, the light valve 320 in this embodiment is, for example, a reflective light valve, such as a DMD or a Liquid Crystal on Silicon Panel (LCoS Panel). A reflection element 311 may be provided on the transmission path of the illumination light beam Bi to reflect the illumination light beam Bi to the light valve 320, but the illumination light beam Bi may also be irradiated on the light valve 320 through other optical elements. And in other embodiments, the light valve 320 may also be a transmissive light valve (such as a transmissive liquid crystal panel), but the type and arrangement position of the matched optical elements need to be adjusted appropriately.

In summary, the lighting system according to the embodiment of the present invention is provided with a dichroic element, a first lens group, and at least one reflective element on the transmission path of the first color light beam, and the excitation light source group is provided by the first lens group. The first color light beam is transmitted to the light wavelength conversion part and reflection part of the phosphor wheel, so the second color light beam reflected by the light wavelength conversion part passes through the color separation element to reflect the second color light beam to the light condensing element. After the second part of the first color light beam reflected by the reflecting part is reflected back to the color separation element, it is transmitted to the at least one reflection element through the color separation element, and the second part of the first color light beam is reflected back to the color separation element through the at least one reflection element. Passed to the condenser element as the illumination beam. Compared with the conventional technology, the illumination system of the embodiment of the present invention uses fewer optical elements, so it can simplify a complicated light path, and can reduce the volume of the illumination system and the projection device using the illumination system.

However, the above are only the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the simple equivalent changes and modifications made according to the scope of the patent application and the description of the invention, All are still within the scope of the invention patent. In addition, any embodiment of the present invention or the scope of patent application does not need to achieve all the purposes or advantages or features disclosed by the invention. In addition, the abstract and the title are only used to assist the search of patent documents, and are not intended to limit the scope of rights of the present invention. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the element or to distinguish between different embodiments or ranges, not to limit the number of elements. Upper or lower limit.

100, 200, 200a, 200b, 200c, 200d, 200e, 200f, 200g, 310‧‧‧ lighting systems

110‧‧‧laser light source module

112‧‧‧ blue light beam

113‧‧‧Green light beam

114‧‧‧ yellow light beam

122‧‧‧ Collimation element

123, 124, 125, 126, 127, 128, 129, 2121, 2122, 231, 232‧‧‧ lens

130‧‧‧color separation film

140, 240, 240a‧‧‧ phosphor wheel

141‧‧‧Back

150, 280, 280a‧‧‧ Filter color wheel

161, 162, 163, 250, 251, 252, 311‧‧‧ reflective elements

170, 270‧‧‧light integration column

210‧‧‧Excitation light source group

211‧‧‧excitation light source

2111‧‧‧ surface

212‧‧‧Second lens group

220, 220a, 220b, 220c ‧‧‧ color separation elements

221, 221a, 221b, 221c‧‧‧Color separation department

222, 222a, 222b, 222c

230‧‧‧The first lens group

241‧‧‧light wavelength conversion section

242‧‧‧Reflection

243‧‧‧Turntable

244‧‧‧light wavelength conversion layer

260‧‧‧Concentrating element

281‧‧‧Filter

282‧‧‧Transmitting Department

283‧‧‧ micro- 稜鏡 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 beam

B2, B21, B22‧‧‧Second color beam

B3, B31, B32‧‧‧ Third color beam

B51, B52, B53, B54, B55, B56, B57, B58, Bi‧‧‧illuminating beams

Bm‧‧‧Image Beam

D1, D2‧‧‧ distance

N1, N2‧‧‧ central axis

O‧‧‧Central location

FIG. 1 is a schematic diagram of a conventional lighting system using a laser light source. FIG. 2 is a schematic diagram of a lighting system according to an embodiment of the present invention. FIG. 3 is a schematic front view of the phosphor wheel of FIG. 2. 4 is a schematic side view of a phosphor wheel of an illumination system according to another embodiment of the present invention. FIG. 5 is a schematic diagram of a lighting system according to another embodiment of the present invention. FIG. 6 is a schematic diagram of a lighting system according to another embodiment of the present invention. FIG. 7 is a schematic diagram of a lighting system according to another embodiment of the present invention. FIG. 8 is a schematic diagram of a lighting system according to another embodiment of the present invention. FIG. 9 is a schematic diagram of a lighting system according to another embodiment of the present invention. FIG. 10 is a schematic diagram of a lighting system according to another embodiment of the present invention. FIG. 11 is a schematic diagram of a lighting system according to another embodiment of the present invention. FIG. 12 is a schematic diagram of a projection apparatus according to an embodiment of the present invention.

Claims (13)

An illumination system includes: an excitation light source group having a first optical axis, the excitation light source group is used to provide a first color light beam; a color separation element is arranged on a transmission path of the first color light beam, the A color element is used to pass the first color beam; a first lens group is disposed on a side of the color separation element away from the excitation light source group, and is used to make the first color beam pass through the color separation element; Through, the first lens group has a second optical axis, wherein the second optical axis and the first optical axis are not coaxial with each other; a phosphor wheel is disposed away from the branch of the first lens group. On the side of the color element, the phosphor wheel has a light wavelength conversion portion and a reflection portion, and the light wavelength conversion portion is used to convert a first part of the first color light beam passing through the first lens group into a first A two-color light beam and reflecting the second color light beam back to the color separation element, and the reflection part is configured to reflect a second part of the first color light beam passing through the first lens group back to the color separation element, The color element is configured to reflect the second color beam and make the second color beam Partially penetrated; at least one reflective element is disposed on a side of the color separation element adjacent to the excitation light source group, and is separated from the color separation element by a distance, and the at least one reflection element is configured to reflect the light passing through the color separation element. The second part of the first color light beam so that the second part of the first color light beam passes through the color separation element again; and a light collecting element arranged near the first lens group of the color separation element On one side, the light condensing element is configured to pass 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. The lighting system according to item 1 of the patent application scope, wherein the excitation light source group includes an excitation light source and a second lens group, and a surface of the excitation light source facing the second lens group has a central axis, and the second The lens group has the first optical axis, and the central axis and the first optical axis are coaxial with each other. The lighting system according to item 1 of the patent application scope, wherein the excitation light source group includes an excitation light source and a second lens group, and a surface of the excitation light source facing the second lens group has a central axis, and the second The lens group has the first optical axis, and the central axis and the first optical axis are not coaxial with each other. The lighting system according to item 1 of the scope of patent application, wherein the color separation element is a dichroic mirror, the first color light beam from the excitation light source group and the second color light beam reflected from the phosphor wheel. And the second part of the first color light beam is transmitted to the color separation element, and the color separation element is used for passing the first color light beam and reflecting the second color light beam. The lighting system according to item 4 of the scope of patent application, further comprising a third-color light source, the third-color light source and the at least one reflective element are arranged on the same side of the color separation element, and the third-color light source is used for providing A third color light beam passes through the dichroic element and is transmitted to the light collecting element. The lighting system according to item 1 of the scope of patent application, wherein the color separation element has a color separation part and a light separation part, the color separation part and the light separation part are adjacent to each other, and the color separation part is located from the excitation light source group On the transmission path of the first color beam, the spectroscopic portion is located on the transmission path of the second portion of the first color beam reflected from the phosphor wheel, and the second color beam is converted by the phosphor. Round reflection to the color separation part and the light separation part, the color separation part is used for passing the first color light beam and reflecting the second color light beam, and the light separation part is used for the first color light beam; Two parts penetrate and pass to the at least one reflective element, and the light splitting part is used for reflecting the second color light beam and transmitting to the light condensing element. The lighting system described in item 1 of the scope of the patent application further includes a third color light source, and the color separation element has a color separation portion and a light separation portion, the color separation portion and the light separation portion are adjacent to each other, and the light separation portion The color part is located on the transmission path of the first color light beam from the excitation light source group, the light splitting part is located on the transmission path of the second part of the first color light beam reflected from the phosphor wheel, and the third part is The color light source and the at least one reflective element are disposed on the same side of the color separation element. The third color light source is used to provide a third color light beam to the light splitting portion, and a portion of the third color light beam penetrates the light splitting portion and is transmitted to The condenser element. The lighting system according to item 1 of the patent application scope, wherein the at least one reflecting element has two reflecting mirrors, and the reflecting mirrors sequentially reflect the second part of the first color light beam passing through the color separation element. The lighting system according to item 1 of the scope of patent application, wherein the phosphor wheel further has a light wavelength conversion layer disposed on the reflection portion and covering a part of the reflection portion, and the light wavelength conversion layer is used for Part of the second part of the first color beam is converted into a fourth color beam. The fourth color beam is reflected by the phosphor wheel to the color separation element, and is reflected by the color separation element to the light collection element. The lighting system according to item 1 of the scope of patent application, wherein the lighting system further includes a light integration post and a filter color wheel, and the filter color wheel is disposed between the light integration post and the light collecting element. The lighting system according to item 10 of the application, wherein a central axis of the light integration post and an optical axis of the light collecting element are coaxial with each other, and a geometric center of the at least one reflection element is located at the light integration post. On the extension of the central axis. The lighting system according to item 11 of the patent application scope, wherein the filter color wheel has at least one filter portion and a light transmission portion, the at least one filter portion provides the second color light beam penetration, and the light transmission The second part of the first color light beam is transmitted through the part, and the light transmitting part is provided with a micro chirp structure to refract the second part of the first color light beam. A projection device includes: the lighting system according to any one of claims 1 to 12 of the scope of patent application, the lighting system is used to provide an illumination light beam; a light valve is arranged in the illumination light beam provided by the lighting system A transmission path to convert the illumination beam into an image beam; and a projection lens disposed on the transmission path of the image beam.