CN210038427U

CN210038427U - Illumination system and projection apparatus

Info

Publication number: CN210038427U
Application number: CN201921079064.XU
Authority: CN
Inventors: 史梅君; 蔡志贤
Original assignee: Coretronic Corp
Current assignee: Coretronic Corp
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-02-07
Anticipated expiration: 2029-07-11

Abstract

An illumination system comprises an excitation light source for providing an excitation light beam, a light splitting element arranged on a transmission path of the excitation light beam, a wavelength conversion device, a reflecting element and a light homogenizing element. The beam splitting element comprises a first region for letting the excitation light beam pass and a second region for letting a part of the excitation light beam pass and reflecting another part of the excitation light beam. The wavelength conversion device is used for moving in sequence to reflect the excitation light beam and convert the excitation light beam into the stimulated light beam, wherein the light splitting element is used for reflecting the stimulated light beam from the wavelength conversion device. The reflecting element is configured on a transmission path of the partial excitation light beam reflected by the wavelength conversion device and passing through the second area so as to reflect the partial excitation light beam to the first area. The utility model discloses also provide a projection arrangement who contains above-mentioned lighting system. The utility model discloses an illumination system and projection arrangement have better radiating effect and improve wavelength conversion element's conversion efficiency to wavelength conversion equipment.

Description

Illumination system and projection apparatus

Technical Field

The present invention relates to an optical system and a device using the same, and more particularly to an illumination system and a projection device.

Background

The projection device is a display device for generating large-size images, and the development of the technology is continuously progressing. The projection device has an imaging principle of converting an illumination beam generated by an illumination system into an image beam by a light valve, and projecting the image beam onto a projection target (such as a screen or a wall surface) through a projection lens to form a projection image.

In addition, with the market demands for brightness, color saturation, service life, non-toxicity, environmental protection, and the like of projection devices, the illumination system has evolved from an Ultra-high-performance (UHP) lamp, a Light-emitting diode (LED), and the most advanced Laser Diode (LD) Light source. However, in the lighting system, the current cost-effective method for generating red and green light is to use a blue laser diode to emit an excitation beam to a fluorescent color wheel, and to use the excitation beam to excite the phosphor of the fluorescent color wheel to generate yellow and green light. Then, the required red light or green light is filtered out by the filter element for use. However, in the conventional illumination system, the fluorescent color wheel has a large volume, and only the color wheel turntable is used for heat dissipation, which results in poor heat dissipation effect. Therefore, the size of the projection device cannot be reduced and the heat dissipation effect is limited.

The background section is only provided to aid in understanding the present invention, and therefore the disclosure in the background section may include some known techniques which do not constitute a part of the knowledge of those skilled in the art. The disclosure in the "background" section does not represent that content or the problems which may be solved by one or more embodiments of the present invention are known or appreciated by those skilled in the art prior to the filing of the present application.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lighting system and projection arrangement, but the volume of contractible wavelength conversion equipment, have better radiating effect to wavelength conversion equipment to and shorten the wavelength conversion component of same position and arouse the time that the light beam shines, and then improve the conversion efficiency who arouses the light beam.

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

To achieve one or a part of or all of the above or other objects, an embodiment of the present invention provides an illumination system, which includes an excitation light source, a light splitting element, a wavelength conversion device, a reflection element, and a light homogenizing element. The excitation light source is used for providing an excitation light beam. The light splitting element is configured on a transmission path of the excitation light beam and comprises a first area and a second area, wherein the first area is used for allowing the excitation light beam to pass through, and the second area is used for allowing one part of the excitation light beam to pass through and reflecting the other part of the excitation light beam. The wavelength conversion device is configured on a transmission path of the excitation light beam passing through the first area and used for moving in time sequence to reflect the excitation light beam and convert the excitation light beam into an excited light beam, wherein the light splitting element is used for reflecting the excited light beam from the wavelength conversion device. The reflecting element is configured on a transmission path of the partial excitation light beam reflected by the wavelength conversion device and passing through the second area so as to reflect the partial excitation light beam to the first area. The dodging element is configured on the transmission paths of the excitation light beams and the stimulated light beams and used for enabling the excitation light beams and the stimulated light beams to pass through so as to form illumination light beams.

In order to achieve one or a part of or all of the above objectives or other objectives, another embodiment of the present invention provides a projection apparatus, which includes an illumination system, at least one light valve, and a projection lens. The illumination system is used for providing an illumination light beam. The illumination system comprises an excitation light source, a light splitting element, a wavelength conversion device, a reflecting element and a light homogenizing element. The excitation light source is used for providing an excitation light beam. The light splitting element is configured on a transmission path of the excitation light beam and comprises a first area and a second area, wherein the first area is used for allowing the excitation light beam to pass through, and the second area is used for allowing one part of the excitation light beam to pass through and reflecting the other part of the excitation light beam. The wavelength conversion device is configured on a transmission path of the excitation light beam passing through the first area and used for moving in time sequence to reflect the excitation light beam and convert the excitation light beam into an excited light beam, wherein the light splitting element is used for reflecting the excited light beam from the wavelength conversion device. The reflecting element is configured on a transmission path of the partial excitation light beam reflected by the wavelength conversion device and passing through the second area so as to reflect the partial excitation light beam to the first area. The dodging element is configured on the transmission paths of the excitation light beams and the stimulated light beams and used for enabling the excitation light beams and the stimulated light beams to pass through so as to form illumination light beams. The at least one light valve is arranged on the transmission path of the illumination light beam and used for converting the illumination light beam into an image light beam. The projection lens is arranged on a transmission path of the image light beam and is used for converting the image light beam into a projection light beam.

Based on the above, the embodiment of the present invention has at least one of the following advantages or effects in the illumination system and the projection apparatus of the present invention, the excitation light source provides the excitation light beam, and the wavelength conversion device moves in time sequence to reflect the excitation light beam and convert the excitation light beam into the excited light beam. In addition, the light splitting element and the reflecting element which are arranged between the excitation light source and the wavelength conversion device can enable the excitation light beam to be transmitted to the wavelength conversion device from the excitation light source, and enable the excitation light beam reflected by the wavelength conversion device and the converted excited light beam to be transmitted to the light homogenizing element at different time sequences respectively. Therefore, the size of the wavelength conversion device can be reduced, the wavelength conversion device has a good heat dissipation effect, the irradiation time of the wavelength conversion element at the same position by the excitation beam is shortened, and the conversion efficiency of the wavelength conversion element is improved.

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

Drawings

Fig. 1 is a schematic view of a projection apparatus according to an embodiment of the present invention.

Fig. 2A and fig. 2B are schematic diagrams of an illumination system according to an embodiment of the present invention at different time sequences respectively.

Fig. 3 is a schematic diagram of the wavelength conversion device of fig. 2A facing the light splitting element.

Fig. 4A and 4B are schematic diagrams of a lighting system according to another embodiment of the present invention at different time sequences respectively.

Fig. 5A and 5B are schematic diagrams and cross-sectional views of a portion of the wavelength conversion device in fig. 4A facing the light splitting element.

Fig. 6A and fig. 6B are schematic diagrams of a lighting system according to another embodiment of the present invention at different time sequences, respectively.

Fig. 7A and 7B are schematic diagrams and cross-sectional views of a portion of the wavelength conversion device of fig. 6A facing the light splitting element.

Fig. 8 is a schematic diagram of a partial wavelength conversion device facing a light splitting element according to another embodiment of the present invention.

Fig. 9 is a schematic diagram of a partial wavelength conversion device facing a light splitting element according to another embodiment of the present invention.

Fig. 10A to fig. 10C are schematic diagrams of a lighting system according to another embodiment of the present invention at different time sequences respectively.

Detailed Description

The foregoing and other features, aspects and utilities of the present invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in 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. 1 is a schematic diagram of a projection apparatus 10 according to an embodiment of the present invention. Please refer to fig. 1. The present embodiment provides a projection apparatus 10, which includes an illumination system 100, at least one light valve 20, and a projection lens 30. The projection apparatus 10 is used for providing the projection light beam LP to a projection target (not shown), such as a screen or a wall.

The illumination system 100 is configured to provide an illumination beam LB. In the present embodiment, the illumination system 100 is formed by combining a plurality of light emitting elements, a wavelength conversion element, a light homogenizing element, a filter element, and a plurality of light splitting and combining elements, for example, to provide light with different wavelengths as the source of image light.

The light valve 20 is disposed on a transmission path of the illumination beam LB and is configured to convert the illumination beam LB into an image beam LI. The light valve 20 is a reflective light modulator such as a Liquid Crystal On Silicon (LCoS) panel, a Digital Micro-mirror Device (DMD), or the like. In some embodiments, the light valve 20 may also be a transmissive light modulator such as a transmissive Liquid Crystal Panel (transmissive Liquid Crystal Panel), an Electro-Optic modulator (Electro-Optic modulator), a Magneto-Optic modulator (Magneto-Optic modulator), an Acousto-Optic modulator (AOM), and the like. The present invention is not limited to the number, type and type of the light valves 20. The detailed steps and embodiments of the method for converting the illumination beam LB into the image beam LI by the light valve 20 can be obtained by the general knowledge in the art, and therefore, the detailed description thereof is omitted here.

The projection lens 30 is disposed on a transmission path of the image light beam LI, and is configured to convert the image light beam LI into a projection light beam LP. The projection lens 30 includes, for example, a combination of one or more optical lenses having diopter, including, for example, various combinations of non-planar lenses such as a biconcave lens, a biconvex lens, a meniscus lens, a convex-concave lens, a plano-convex lens, and a plano-concave lens. In an embodiment, the projection lens 30 may further include a planar optical lens, which reflects the projection beam in a reflective manner to project the projection beam onto the projection target. The present invention is not limited to the type and kind of the projection lens 30.

In addition, in some embodiments, the projection apparatus 10 may further optionally include an optical element with a light condensing, refracting or reflecting function, for guiding the illumination beam LB emitted from the illumination system 100 to the light valve 20, and for guiding the image beam LI emitted from the light valve 20 to the projection lens 30, so as to generate the projection beam LP, but the invention is not limited thereto.

Fig. 2A and fig. 2B are schematic diagrams of an illumination system according to an embodiment of the present invention at different time sequences respectively. Please refer to fig. 2A. In the present embodiment, the illumination system 100 includes an excitation light source 110, a light splitting element 120, a wavelength conversion device 130, a reflection element 140, and a light homogenizing element 150. The excitation light source 110 is used to provide an excitation light beam L1. The excitation light source 110 is, for example, a blue laser diode, so that the excitation light beam L1 is blue light, but the invention is not limited thereto.

The beam splitter 120 is disposed on the transmission path of the excitation light beam L1, and is used for reflecting or transmitting the excitation light beam L1. In detail, the light splitting element 120 includes a first region 122 and a second region 124, wherein the first region 122 is configured to pass the excitation light beam L1. The second region 124 is for passing one part of the excitation light beam L1 and reflecting the other part of the excitation light beam L1. For example, the first region 122 is, for example, a beam splitter that transmits blue light and reflects yellow light, and the second region 124 is, for example, a beam splitter that transmits a portion of blue light and reflects another portion of blue light and reflects yellow light. In the present embodiment, the transmittance and reflectance of the excitation light beam L1 by the second region 124 are respectively about 50%, i.e., half transmittance and half reflectance. It should be noted that most of the blue light penetrates the first region 122, that is, the transmittance of the blue light to the first region 122 is higher than 90%.

The wavelength conversion device 130 is disposed on a transmission path of the excitation light beam L1 passing through the first region 122, and is configured to move in sequence to reflect the excitation light beam L1 and convert the excitation light beam L1 into the stimulated light beam L2, wherein the light splitting element 120 is configured to reflect the stimulated light beam L2 from the wavelength conversion device 130. In other words, the first region 122 is used for passing the excitation light beam L1 and for reflecting the excited light beam L2. The second region 124 is for passing a portion of the excitation light beam L1, reflecting another portion of the excitation light beam L1, and for reflecting the excited light beam L2.

Fig. 3 is a schematic diagram of the wavelength conversion device of fig. 2A facing the light splitting element. Please refer to fig. 2A to fig. 3. In the present embodiment, the wavelength conversion device 130 is a reflective optical element, and includes a wavelength conversion element 132, a heat dissipation element 134, and a driving element 136. The wavelength converting element 132 is connected to a heat dissipating element 134. The wavelength conversion element 132 is, for example, a conversion element made of phosphor or other kinds of fluorescent materials for converting blue light into yellow light. Therefore, when the excitation light beam L1 of blue light is irradiated to the wavelength converting element 132, the wavelength converting element 132 converts the excitation light beam L1 of blue light into the excited light beam L2 of yellow light, and reflects back to the light splitting element 120.

The heat dissipation element 134 is, for example, a heat sink or heat sink made of metal material, and the surface thereof can be made into a smooth plane to reflect the light beam. In the present embodiment, at least a portion of the heat dissipation element 134 is used to reflect the excitation light beam L1. The driving element 136 is used for driving the wavelength conversion element 132 and the heat dissipation element 134 to move along at least one direction D, wherein the at least one direction D is perpendicular to the main transmission direction of the excitation light beam L1, as shown in fig. 2A. The driving element 136 is, for example, a motor, a vibrator or a piezoelectric material, and the present invention is not limited to the type and kind of the driving element 136. In the present embodiment, the two timings can be classified according to the position of the excitation beam L1 transmitted to the wavelength conversion device 130. At the first timing, the driving element 136 drives the wavelength conversion element 132 and the heat dissipation element 134 to move upward along the direction D, so that the excitation light beam L1 is transmitted to the heat dissipation element 134, and the excitation light beam L1 is reflected by the surface of the heat dissipation element 134, as shown in fig. 2A. At the second timing, the driving element 136 drives the wavelength conversion element 132 and the heat dissipation element 134 to move downward along the direction D, so that the excitation light beam L1 is transmitted to the wavelength conversion element 132, and the excited light beam L2 is converted by the wavelength conversion element 132, as shown in fig. 2B. The present invention is not limited to the number, type, and kind of the driving elements 136 and the manner of moving the wavelength conversion elements 132 and the heat dissipation elements 134.

The reflective element 140 is disposed on a transmission path of the portion of the excitation light beam L1 reflected by the wavelength conversion device 130 and passing through the second region 124 to reflect a portion of the excitation light beam L1 to the first region 122. The reflective element 140 is, for example, a mirror. In detail, the reflection element 140 is disposed on the side of the second region 124 opposite to the wavelength conversion device 130 in the direction parallel to the transmission path of the excitation light beam L1, and is disposed at a position corresponding to the first region 122 in the direction perpendicular to the transmission path of the excitation light beam L1. Therefore, the excitation light beam L1 passing through the second region 124 is reflected by the reflective element 140 and passes through the first region 122.

The dodging element 150 is disposed on a transmission path of the excitation light beam L1 and the stimulated light beam L2, and configured to pass the excitation light beam L1 and the stimulated light beam L2 to form the illumination light beam LB. The dodging device 150 can adjust the spot shape of the illumination beam LB to match the shape (e.g., rectangular) of the working area of the light valve 20, and the spot has uniform or close light intensity everywhere to uniform the light intensity of the illumination beam LB. In the present embodiment, the light uniformizing element 150 is, for example, an integrating rod, but in other embodiments, the light uniformizing element 150 may also be other suitable types of optical elements, such as a lens array (fly eye lens), and the invention is not limited thereto.

In the present embodiment, the wavelength conversion device 130 can be moved in time sequence to reflect the excitation light beam L1 and convert the excitation light beam L1 into the excited light beam L2. In addition, since the first region 122 and the second region 124 are distributed in the vertical direction corresponding to each half of the subsequent light transmission path. Therefore, the beam splitting element 120 and the reflection element 140 disposed between the excitation light source 110 and the wavelength conversion device 130 can transmit the excitation light beam L1 from the excitation light source 110 to the wavelength conversion device 130, and transmit the excitation light beam L1 reflected by the wavelength conversion device 130 and the converted stimulated light beam L2 to the dodging element 150 at different timings respectively and uniformly. In this way, the volume of the wavelength conversion device 130 can be reduced, a larger heat dissipation element 134 can be used in the available space, the heat dissipation effect on the wavelength conversion device 130 is better, the time for the wavelength conversion element 132 at the same position to be irradiated by the excitation beam is shortened, and the conversion efficiency of the wavelength conversion element 132 is further improved.

Fig. 4A and 4B are schematic diagrams of a lighting system according to another embodiment of the present invention at different time sequences respectively. Fig. 5A and 5B are schematic diagrams and cross-sectional views of a portion of the wavelength conversion device in fig. 4A facing the light splitting element. Please refer to fig. 4A to fig. 5B. The illumination system 100A of the present embodiment is similar to the illumination system 100 of fig. 2A. The difference is that the wavelength conversion device 130A of the present embodiment is different from the wavelength conversion device 130 of fig. 2A. In detail, in the present embodiment, the wavelength conversion element 132A includes at least one wavelength conversion portion Y and a substrate SB, and the at least one wavelength conversion portion Y is disposed on the substrate SB, as shown in fig. 5A and 5B. The wavelength conversion section Y is configured to receive the excitation light beam L1 to convert into an excited light beam L2. The substrate SB is made of a material having a high reflection characteristic, or a material having a high reflection coating, such as silver or aluminum, is plated on the surface of the substrate SB. The wavelength converting member Y is, for example, a fluorescent layer formed on the surface of the substrate SB, and the number of the wavelength converting members Y is one. More specifically, in the present embodiment, the area of the wavelength converting region Y is substantially equal to the area of the substrate SB. That is, the entire surface of the substrate SB is coated with the wavelength converting region Y.

In the present embodiment, the two timings can be classified according to the position of the excitation beam L1 transmitted to the wavelength conversion device 130A. At the first timing, the driving element 136 drives the wavelength conversion element 132A and the heat dissipation element 134 to move upward along the direction D, so that the excitation light beam L1 is transmitted to the heat dissipation element 134, and the excitation light beam L1 is reflected by the surface of the heat dissipation element 134, as shown in fig. 4A. At the second timing, the driving element 136 drives the wavelength conversion element 132A and the heat dissipation element 134 to move downward along the direction D, so that the excitation light beam L1 is transmitted to the wavelength conversion element 132A, and is converted into the excited light beam L2 by the wavelength conversion portion Y on the wavelength conversion element 132A, as shown in fig. 4B. It should be noted that, since the position of the wavelength converting region Y irradiated with the excitation light beam L1 is continuously moved, the excitation light beam L1 is transmitted to the first position of the wavelength converting region Y at different times. At another time different from the above time, the excitation light beam L1 is transmitted to the second position of the wavelength converting region Y, and the distance between the first position and the second position is greater than 0. In this way, it is possible to prevent the conversion efficiency of the excitation light beam L1 from being reduced by irradiating the excitation light beam L1 at the same position of the wavelength converting region Y for too long.

Fig. 6A and fig. 6B are schematic diagrams of a lighting system according to another embodiment of the present invention at different time sequences, respectively. Fig. 7A and 7B are schematic diagrams and cross-sectional views of a portion of the wavelength conversion device of fig. 6A facing the light splitting element. Please refer to fig. 6A to fig. 7B. The illumination system 100B of the present embodiment is similar to the illumination system 100A of fig. 4A. The difference is that the wavelength conversion device 130B of the present embodiment is different from the wavelength conversion device 130A of fig. 4A. In detail, in the present embodiment, the area of the wavelength converting region Y of the wavelength converting element 132B is smaller than the area of the substrate SB, and the wavelength converting region Y exposes a portion of the substrate SB to reflect the excitation light beam L1, as illustrated in fig. 7A and 7B. The wavelength conversion section Y is configured to receive the excitation light beam L1 to convert into an excited light beam L2.

In the present embodiment, the two timings can be classified according to the position of the excitation beam L1 transmitted to the wavelength conversion device 130B. At the first timing, the driving element 136 drives the wavelength conversion element 132B and the heat dissipation element 134 to move upward along the direction D, so that the excitation light beam L1 is transmitted to the substrate SB of the wavelength conversion element 132B, and the excitation light beam L1 is reflected by the surface of the substrate SB, as shown in fig. 6A. At the second timing, the driving element 136 drives the wavelength conversion element 132B and the heat dissipation element 134 to move downward along the direction D, so that the excitation light beam L1 is transmitted to the wavelength conversion portion Y of the wavelength conversion element 132B, and the excitation light beam L2 is converted by the wavelength conversion portion Y on the wavelength conversion element 132B, as shown in fig. 6B.

Fig. 8 is a schematic diagram of a partial wavelength conversion device facing a light splitting element according to another embodiment of the present invention. Please refer to fig. 8. The partial wavelength conversion device 132C of the present embodiment is similar to the partial wavelength conversion device 132B of fig. 7A. The difference therebetween is that the distribution of the wavelength converting region Y on the substrate SB of the present embodiment is different from that of the wavelength converting region Y on the substrate SB of fig. 7A. In detail, in some embodiments, the number of the wavelength converting regions Y may be plural, and the wavelength converting regions Y are arranged linearly on the substrate SB. For example, in the present embodiment, the number of the wavelength converting regions Y is three, and the wavelength converting regions Y are arranged along the direction D. Therefore, at different timings, the driving element 136 (see fig. 6A) drives the wavelength conversion element 132C to move back and forth along the direction D, so that the excitation light beam L1 (see fig. 6A) is sequentially transmitted to the three wavelength conversion portions Y of the wavelength conversion element 132C, and is transmitted to the substrate SB while being transmitted to the three wavelength conversion portions Y, respectively, in a staggered manner, and the excitation light beam L1 is reflected by the surface of the substrate SB. In this way, it is possible to avoid that the excitation light beam L1 is irradiated on the same position of the wavelength converting region Y for too long to reduce the conversion efficiency of the wavelength converting region Y (see fig. 6B). In addition, the wavelength conversion parts Y are arranged at intervals and are not connected, so that the heat insulation effect is achieved.

Fig. 9 is a schematic diagram of a partial wavelength conversion device facing a light splitting element according to another embodiment of the present invention. Please refer to fig. 9. The partial wavelength conversion device 132D of the present embodiment is similar to the partial wavelength conversion device 132C of fig. 8. The difference therebetween is that the distribution of the wavelength converting region Y on the substrate SB of the present embodiment is different from that of fig. 8. In detail, in some embodiments, the number of the wavelength converting regions Y may be multiple, and the wavelength converting regions Y are arranged in an array on the substrate SB. For example, in the present embodiment, the number of the wavelength converting regions Y is nine, and the wavelength converting regions Y are arranged in an array along the parallel direction D1 and the perpendicular direction D2. Therefore, at different timings, the driving element 136 (see fig. 6A) drives the wavelength conversion element 132D to move back and forth along the parallel direction D1 and the perpendicular direction D2, for example, in a circular movement, a square movement or a serpentine movement, so that the excitation light beam L1 (see fig. 6A) is sequentially transmitted to the nine wavelength conversion portions Y of the wavelength conversion element 132D, and is transmitted to the substrate SB while being transmitted to the nine wavelength conversion portions Y, respectively and the excitation light beam L1 is reflected by the surface of the substrate SB. In this way, it is possible to avoid that the excitation light beam L1 is irradiated on the same position of the wavelength converting region Y for too long to reduce the conversion efficiency of the wavelength converting region Y (see fig. 6B). It should be noted that in this embodiment, it is not limited that only one driving element 136 can be used to drive the movement of the wavelength conversion element 132D in two directions, and two driving elements 136, such as a motor or an actuator, can be used to drive the movement of the wavelength conversion element 132D in two directions respectively.

Fig. 10A to fig. 10C are schematic diagrams of a lighting system according to another embodiment of the present invention at different time sequences respectively. Please refer to fig. 10A to 10C. The illumination system 100C of the present embodiment is similar to the illumination system 100 of fig. 2A. The difference is that the wavelength conversion device 130C of the present embodiment is different from the wavelength conversion device 130 of fig. 2A. In detail, in the present embodiment, the wavelength conversion element 132E includes two different wavelength conversion portions Y, G and a substrate SB, and the two different wavelength conversion portions Y, G are disposed on the substrate SB. In detail, the wavelength converting region Y is composed of a wavelength converting material of the excited light beam L2 for converting the excitation light beam L1 into yellow light, and the wavelength converting region G is composed of a wavelength converting material of the excited light beam L3 for converting the excitation light beam L1 into green light.

In the present embodiment, the positions of the excitation light beam L1 transmitted to the wavelength conversion element 130E can be classified into three sequences. At the first timing, the excitation light beam L1 is transmitted to the first position of the substrate SB of the wavelength conversion element 132E, and the excitation light beam L1 is reflected by the surface of the substrate SB, as shown in fig. 10A. At the second timing, the excitation light beam L1 is transmitted to the second position of the wavelength conversion element 132E, and is converted into the excited light beam L2 of yellow light by the wavelength conversion portion Y of the wavelength conversion element 132E, as shown in fig. 10B. At the third timing, the excitation light beam L1 passes to the third position of the wavelength conversion element 132E, and is converted into the excited light beam L3 of green light by the wavelength conversion portion G on the wavelength conversion element 132E, as shown in fig. 10C. In this way, the volume of the wavelength conversion device 130C can be reduced, a larger heat dissipation element 134 can be used in the available space, a better heat dissipation effect can be achieved for the wavelength conversion device 130C, the time for the wavelength conversion part Y and/or the wavelength conversion part G at the same position to be irradiated with the excitation light beam L1 can be shortened, and the conversion efficiency of the wavelength conversion part Y and/or the wavelength conversion part G can be improved. The wavelength converting regions Y and G may be arranged so that any two wavelength converting regions of different colors are spaced apart from each other as shown in fig. 8 or 9, but the present invention is not limited thereto.

To sum up, the embodiment of the present invention has at least one of the following advantages or effects in the illumination system and the projection apparatus of the present invention, the excitation light source provides the excitation light beam, and the wavelength conversion device moves in time sequence to reflect the excitation light beam and convert the excitation light beam into the excited light beam. In addition, the light splitting element and the reflecting element which are arranged between the excitation light source and the wavelength conversion device can enable the excitation light beam to be transmitted to the wavelength conversion device from the excitation light source, and enable the excitation light beam reflected by the wavelength conversion device and the converted excited light beam to be transmitted to the light homogenizing element at different time sequences respectively. Therefore, the size of the wavelength conversion device can be reduced, the wavelength conversion device has a good heat dissipation effect, the irradiation time of the wavelength conversion element at the same position by the excitation beam is shortened, and the conversion efficiency of the wavelength conversion element is improved. In addition, the characteristics and configuration of the middle reflection element of the present invention can make the incident light quantity of the light uniformizing element uniform.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the contents of the present invention are still included in the scope of the present invention. Moreover, it is not necessary for any embodiment or claim of the invention to address all of the objects, advantages, or features disclosed herein. In addition, the abstract and the title of the invention are provided for assisting the search of patent documents and are not intended to limit the scope of the invention. Furthermore, the terms "first", "second", and the like in the description or the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.

Description of reference numerals:

10: projection device

20: light valve

30: projection lens

100. 100A, 100B, 100C: lighting system

110: excitation light source

120: light splitting element

122: first region

124: second region

130. 130A, 130B, 130C: wavelength conversion device

132. 132A, 132B, 132C, 132D, 132E: wavelength conversion element

134: heat dissipation element

136: driving element

140: reflective element

150: light uniformizing element

D: direction of rotation

D1: parallel direction

D2: in the vertical direction

L1: excitation light beam

L2, L3: stimulated light beam

LB: illuminating light beam

And LI: image light beam

And (3) LP: projection light beam

SB: substrate

G. Y: a wavelength conversion section.

Claims

1. An illumination system comprising an excitation light source, a light splitting element, a wavelength conversion device, a reflecting element, and a light homogenizing element, wherein:

the excitation light source is used for providing an excitation light beam;

the light splitting element is configured on a transmission path of the excitation light beam and comprises a first area and a second area, wherein the first area is used for allowing the excitation light beam to pass through, and the second area is used for allowing one part of the excitation light beam to pass through and reflecting the other part of the excitation light beam;

the wavelength conversion device is arranged on a transmission path of the excitation light beam passing through the first area and used for moving in time sequence to reflect the excitation light beam and convert the excitation light beam into an excited light beam, wherein the light splitting element is used for reflecting the excited light beam from the wavelength conversion device;

the reflective element is configured on a transmission path of the excitation light beam reflected by the wavelength conversion device and passing through the portion of the second region to reflect the portion of the excitation light beam to the first region; and

the light homogenizing element is configured on the transmission paths of the excitation light beams and the excited light beams and is used for enabling the excitation light beams and the excited light beams to pass through so as to form illumination light beams.

2. The illumination system of claim 1, wherein the wavelength conversion device comprises a wavelength conversion element, a heat dissipation element, and a driving element, the wavelength conversion element is connected to the heat dissipation element, and the driving element is configured to drive the wavelength conversion element and the heat dissipation element to move along at least one direction, and the at least one direction is perpendicular to the main transmission direction of the excitation light beam.

3. The illumination system of claim 2, wherein at least a portion of the heat dissipation element is configured to reflect the excitation light beam.

4. The illumination system of claim 2, wherein the wavelength conversion element comprises at least one wavelength conversion portion and a substrate, and the at least one wavelength conversion portion is disposed on the substrate, the at least one wavelength conversion portion configured to receive the excitation light beam for conversion into the stimulated light beam.

5. The illumination system of claim 4, wherein an area of the at least one wavelength converting region is equal to an area of the substrate.

6. The illumination system of claim 4, wherein the at least one wavelength converting region has an area smaller than an area of the substrate, and the at least one wavelength converting region exposes a portion of the substrate to reflect the excitation light beam.

7. The illumination system according to claim 4, wherein the at least one wavelength converting region is plural in number and is linearly arranged on the substrate.

8. The illumination system according to claim 4, wherein the at least one wavelength converting region is plural in number and arranged in an array on the substrate.

9. The illumination system of claim 4, wherein the excitation light beam is delivered to a first location of the at least one wavelength conversion portion at a first timing, the excitation light beam is delivered to a second location of the at least one wavelength conversion portion at a second timing, and the first location is spaced from the second location by a distance greater than 0.

10. The illumination system of claim 4, wherein the at least one wavelength conversion portion comprises two wavelength conversion portions with different colors, and the excitation light beam is transmitted to a first position of the substrate to reflect the excitation light beam during a first time sequence, and the excitation light beam is transmitted to a second position and a third position of the two wavelength conversion portions with different colors to generate the excited light with different colors during a second time sequence and a third time sequence, respectively.

11. A projection device, comprising an illumination system, at least one light valve, and a projection lens, wherein:

the illumination system is used for providing an illumination light beam, and comprises an excitation light source, a light splitting element, a wavelength conversion device, a reflecting element and a light homogenizing element, wherein:

the excitation light source is used for providing an excitation light beam;

the light homogenizing element is configured on a transmission path of the excitation light beam and the excited light beam and is used for allowing the excitation light beam and the excited light beam to pass through so as to form the illumination light beam;

the at least one light valve is arranged on the transmission path of the illumination light beam and is used for converting the illumination light beam into an image light beam; and

the projection lens is arranged on a transmission path of the image light beam and used for converting the image light beam into a projection light beam.

12. The projection device of claim 11, wherein the wavelength conversion device comprises a wavelength conversion element, a heat dissipation element, and a driving element, the wavelength conversion element is connected to the heat dissipation element, and the driving element is configured to drive the wavelength conversion element and the heat dissipation element to move along at least one direction, and the at least one direction is perpendicular to the main transmission direction of the excitation light beam.

13. The projection device of claim 12, wherein at least a portion of the heat sink element is configured to reflect the excitation light beam.

14. The projection device of claim 12, wherein the wavelength conversion element comprises at least one wavelength conversion portion and a substrate, and the at least one wavelength conversion portion is disposed on the substrate, and the at least one wavelength conversion portion is configured to receive the excitation light beam for conversion into the stimulated light beam.

15. The projection device of claim 14, wherein an area of the at least one wavelength converting region is equal to an area of the substrate.

16. The projection device of claim 14, wherein the at least one wavelength converting region has an area smaller than an area of the substrate, and the at least one wavelength converting region exposes a portion of the substrate to reflect the excitation light beam.

17. The projection apparatus according to claim 14, wherein the at least one wavelength converting region is plural in number and is linearly arranged on the substrate.

18. The projection apparatus according to claim 14, wherein the at least one wavelength converting region is plural in number and arranged in an array on the substrate.

19. The projection apparatus of claim 14, wherein the excitation light beam is transmitted to a first location of the at least one wavelength conversion portion at a first timing, and the excitation light beam is transmitted to a second location of the at least one wavelength conversion portion at a second timing, and wherein a distance between the first location and the second location is greater than 0.

20. The projection apparatus according to claim 14, wherein the at least one wavelength converting region comprises two wavelength converting regions of different colors, the excitation light beam is transmitted to a first position of the substrate to reflect the excitation light beam during a first time sequence, and the excitation light beam is transmitted to a second position and a third position of the two wavelength converting regions of different colors to generate the excited light beams of different colors during a second time sequence and a third time sequence, respectively.