Illumination system and projection device

Abstract

A lighting system includes a light source module, a plurality of optical elements, and a wavelength conversion element. The plurality of optical elements comprise a light splitting element and at least one lens. Wherein the at least one lens is located between the light splitting element and the wavelength conversion element. The light splitting element is arranged on a transmission path of the laser beam and used for guiding the laser beam to be transmitted to the at least one lens, and the laser beam penetrates through the at least one lens and then is transmitted to the wavelength conversion element. Wherein at least one of the plurality of optical elements comprises a body and a light absorption structure, a light spot is formed on the body when a laser beam enters the body, the area where the light spot is located is defined as a first area, the first area is located on one side of the central axis of the body, and the other side of the central axis of the body is provided with a second area; wherein the light absorbing structure is distributed on at least one part of the edge of the body, and at least one part is adjacent to the second area. Therefore, the optical element is prevented from cracking due to temperature difference.

Description

Technical Field

[0001] The invention relates to an optical system and an electronic device, and in particular to an illumination system and a projection device. Background Art

[0002] Projection devices are display devices used to produce large-size images. With the evolution and innovation of science and technology, they have been continuously improving. The imaging principle of projection devices is to convert the illumination beam generated by the lighting system into an image beam through a light valve, and then project the image beam through a projection lens to the projection target (for example, a screen or a wall) to form a projection image. In addition, the lighting system has also evolved from ultra-high-performance lamps (UHP lamps) and light-emitting diodes (LEDs) to the most advanced laser diode (LD) light sources, and even packaged light sources formed by all-in-one laser diodes have been introduced to make the internal configuration of the projection device more compact and the optical performance better.

[0003] In current optical systems, laser irradiation passes through various optical elements and the light beam is focused on a wavelength conversion color wheel. In order to make the optical system have better optical performance, glass is chosen as the main material. However, when the glass is irradiated by the light beam, it is easy to cause the center temperature to rise, making the edge temperature relatively low, which in turn causes the tensile stress of the glass to be unbalanced and make the glass easy to break.

[0004] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some known technologies that are not known to those skilled in the art. The content disclosed in the "background technology" section does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those skilled in the art before the application of the present invention. Summary of the invention

[0005] The present invention provides an illumination system and a projection device, which can prevent an optical element from being broken due to temperature difference, improve the stability of the optical element, and thus have good optical quality.

[0006] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0007] In order to achieve one or part or all of the above purposes or other purposes, the present invention provides a lighting system, including a light source module, a plurality of optical elements and a wavelength conversion element. The light source module is used to provide a laser beam. The plurality of optical elements are arranged on the transmission path of the laser beam and are located between the light source module and the wavelength conversion element, wherein the plurality of optical elements include a spectroscopic element and at least one lens. Among them, at least one lens is located between the spectroscopic element and the wavelength conversion element. The spectroscopic element is arranged on the transmission path of the laser beam to guide the laser beam to be transmitted to at least one lens, and the laser beam is transmitted to the wavelength conversion element after passing through at least one lens. The wavelength conversion element is arranged on the transmission path of the laser beam from at least one lens to reflect the laser beam back to the spectroscopic element and convert the laser beam into an excited beam and then reflect it back to the spectroscopic element. Among them, at least one of the spectroscopic element and at least one lens includes a main body and a light absorbing structure. When the laser beam is incident on the main body, a light spot is formed on the main body, and the area where the light spot is located is defined as a first area. The first area is located on one side of the central axis of the main body, and the other side of the central axis of the main body has a second area, wherein the light absorbing structure is distributed on at least a portion of the edge of the main body, and at least a portion is adjacent to the second area.

[0008] To achieve one or part or all of the above purposes or other purposes, the present invention provides another lighting system, including a light source module, a plurality of optical elements, a wavelength conversion element and a uniform light element. The light source module is used to provide a laser beam. The plurality of optical elements are arranged on the transmission path of the laser beam and are located between the light source module and the wavelength conversion element. The plurality of optical elements include a beam splitter and a lens group. The lens group includes at least one first lens, at least one second lens and at least one third lens, wherein at least one first lens is located between the beam splitter and the wavelength conversion element. At least one second lens is located between the light source module and the beam splitter. At least one third lens is located between the beam splitter and the uniform light element. The beam splitter is arranged on the transmission path of the laser beam to guide the laser beam passing through at least one second lens to be transmitted to at least one first lens. The laser beam is transmitted to the wavelength conversion element after passing through at least one first lens. The wavelength conversion element is arranged on the transmission path of the laser beam from at least one first lens to allow the laser beam to pass through and convert the laser beam into an excited beam and then reflect it back to the beam splitter. The beam splitter then guides the excited light beam to at least one third lens and then to the light homogenizing element. At least one of the beam splitter and the lens group includes a body and a light absorbing structure. When the laser beam is incident on the body, a light spot is formed on the body, and the area where the light spot is located is defined as the first area, wherein the central axis of the body passes through the first area, and the light absorbing structure is distributed on the edge of the body away from the first area.

[0009] In order to achieve one or part or all of the above purposes or other purposes, the present invention further provides a projection device, including an illumination system, a light valve and a projection lens. The illumination system is used to provide an illumination beam, and the illumination system includes a light source module, a plurality of optical elements and a wavelength conversion element. The light source module is used to provide a laser beam. The plurality of optical elements are arranged on the transmission path of the laser beam and are located between the light source module and the wavelength conversion element, wherein the plurality of optical elements include a spectroscopic element and at least one lens. At least one lens is located between the spectroscopic element and the wavelength conversion element. The spectroscopic element is arranged on the transmission path of the laser beam to guide the laser beam to be transmitted to at least one lens, and the laser beam is transmitted to the wavelength conversion element after passing through at least one lens. The wavelength conversion element is arranged on the transmission path of the laser beam from at least one lens to reflect the laser beam back to the spectroscopic element and to convert the laser beam into an excited beam and then reflect it back to the spectroscopic element. At least one of the beam splitter and at least one lens includes a body and a light absorbing structure. When the laser beam is incident on the body, a light spot is formed on the body, and the area where the light spot is located is defined as a first area. The first area is located on one side of the central axis of the body, and the other side of the central axis of the body has a second area, wherein the light absorbing structure is distributed on at least a portion of the edge of the body, and at least a portion is adjacent to the second area. The light valve is arranged on the transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is arranged on the transmission path of the image beam to project the image beam out of the projection device.

[0010] In order to achieve one or part or all of the above purposes or other purposes, the present invention further provides another projection device, including an illumination system, a light valve and a projection lens. The illumination system is used to provide an illumination beam, and the illumination system includes a light source module, a plurality of optical elements, a wavelength conversion element and a uniform light element. The light source module is used to provide a laser beam. The plurality of optical elements are arranged on the transmission path of the laser beam and are located between the light source module and the wavelength conversion element. The plurality of optical elements include a beam splitter and a lens group. The lens group includes at least one first lens, at least one second lens and at least one third lens, wherein at least one first lens is located between the beam splitter and the wavelength conversion element. At least one second lens is located between the light source module and the beam splitter. At least one third lens is located between the beam splitter and the uniform light element. The beam splitter is arranged on the transmission path of the laser beam to guide the laser beam passing through at least one second lens to be transmitted to at least one first lens. The laser beam is transmitted to the wavelength conversion element after passing through at least one first lens. The wavelength conversion element is arranged on the transmission path of the laser beam from at least one first lens, so as to allow the laser beam to pass through and convert the laser beam into an excited beam and then reflect it back to the spectroscopic element. The spectroscopic element then guides the excited beam to at least one third lens and then to the light homogenizing element. Among them, at least one of the spectroscopic element and the lens group includes a body and a light absorbing structure. When the laser beam is incident on the body, a light spot is formed on the body, and the area where the light spot is located is defined as the first area, wherein the central axis of the body passes through the first area. The light absorbing structure is distributed on the edge of the body away from the first area. The light valve is arranged on the transmission path of the illumination beam, so as to convert the illumination beam into an image beam. The projection lens is arranged on the transmission path of the image beam, so as to project the image beam out of the projection device.

[0011] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the lighting system and projection device of the present invention, the lighting system includes a light source module, a plurality of optical elements and a wavelength conversion element. The plurality of optical elements include a beam splitter and at least one lens, and at least one of the plurality of optical elements includes a body and a light absorbing structure, and the light absorbing structure is distributed on at least a portion of the edge of the body. In this way, the light absorbing structure can absorb stray light and increase the corresponding edge temperature, thereby preventing the optical element from breaking due to temperature difference, thereby improving the stability of the optical element and having good optical quality.

[0012] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. 4 is a schematic diagram of a projection device according to an embodiment of the present invention.

[0014] Figure 2 FIG. 4 is a schematic diagram of a lighting system according to an embodiment of the present invention.

[0015] Figure 3 FIG. 4 is a schematic diagram of a light splitting element according to an embodiment of the present invention.

[0016] FIG. 4A to FIG. 4C They are schematic diagrams of light absorption structures on the body according to different embodiments of the present invention.

[0017] Figure 5A FIG. 4 is a schematic diagram of a focusing lens according to an embodiment of the present invention.

[0018] Figure 5B FIG. 4 is a schematic diagram of another focusing lens according to an embodiment of the present invention.

[0019] Figure 6 FIG. 4 is a schematic diagram of a collimating lens according to an embodiment of the present invention.

[0020] Figure 7 FIG. 4 is a schematic diagram of a lighting system according to another embodiment of the present invention.

[0021] Figure 8 FIG. 4 is a schematic diagram of a light splitting element according to another embodiment of the present invention.

[0022] Fig. 9 FIG. 4 is a schematic diagram of a focusing lens according to another embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 10: Projection device

[0025] 60: Light valve

[0026] 70: Projection lens

[0027] 100,100A: Lighting system

[0028] 110: Light source module

[0029] 120: Optical components

[0030] 122,122A: Spectral element

[0031] 124,124A: Lens

[0032] 130,130A: Wavelength conversion element

[0033] 140: Collimating lens

[0034] 150: Focusing lens

[0035] 160: Light homogenization element

[0036] 170: Light Transfer Components

[0037] 210: First lens

[0038] 220: Second lens

[0039] 230: Light transfer lens

[0040] 240: Reflector

[0041] 300, 300A, 300B, 300A', 300B': body

[0042] 310,310A',310B',310A",310B",310A~310C: light absorbing structure

[0043] A1, A1': First area

[0044] A2, A2': Second area

[0045] A3, A3': Central area

[0046] C1, C2, C3, C1', C2': Central axis

[0047] L1: Laser beam

[0048] L2: stimulated beam

[0049] LB: Lighting beam

[0050] LI: Image beam. DETAILED DESCRIPTION

[0051] The above-mentioned 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 back, etc., are only the directions with reference to the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0052] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 1 The present embodiment provides a projection device 10, including an illumination system 100, a light valve 60, and a projection lens 70. The illumination system 100 is used to provide an illumination beam LB. The light valve 60 is disposed on the transmission path of the illumination beam LB, and is used to convert the illumination beam LB into an image beam LI. The projection lens 70 is disposed on the transmission path of the image beam LI, and is used to project the image beam LI out of the projection device 10 to a projection target (not shown), such as a screen or a wall.

[0053] The illumination system 100 is used to provide an illumination beam LB. Specifically, in the present embodiment, the illumination system 100 is used to provide light of different wavelengths by at least one light emitting element to form an image beam LI. The light emitting element is, for example, a light emitting diode (LED) or a laser diode (LD). However, the present invention does not limit the type or form of the illumination system 100 in the projection device 10. The detailed optical structure and implementation method thereof can be sufficiently taught, suggested and implemented by the common knowledge in the relevant technical field, and thus will not be described in detail.

[0054] The light valve 60 is, for example, a reflective light modulator such as a Liquid Crystal On Silicon panel (LCoS panel) or a Digital Micro-mirror Device (DMD). In some embodiments, the light valve 60 may also be a transmissive light modulator such as a Transparent Liquid Crystal Panel, an Electro-Optical Modulator, a Magneto-Optic modulator, or an Acousto-Optic Modulator (AOM). The present invention does not limit the type and kind of the light valve 60. The detailed steps and implementation methods of the method of converting the illumination light beam LB into the image light beam LI by the light valve 60 can be sufficiently taught, suggested, and implemented by the common knowledge in the relevant technical field, so they are not repeated here. In the present embodiment, the number of the light valve 60 is one, for example, a projection device 10 using a single digital micromirror device, but in other embodiments, the number of the light valve 60 may be multiple, and the present invention is not limited thereto.

[0055] The projection lens 70 includes, for example, a combination of one or more optical lenses with diopter, such as various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 70 may also include a planar optical lens to project the image beam LI from the light valve 60 to the projection target in a reflective manner. The present invention does not limit the type and type of the projection lens 70.

[0056] Figure 2 This is a schematic diagram of a lighting system according to an embodiment of the present invention. Figure 2 . Figure 2 The lighting system 100 shown is applicable to at least Figure 1The projection device 10 is shown, so the following description is taken as an example. In this embodiment, the lighting system 100 includes a light source module 110, a plurality of optical elements 120, and a wavelength conversion element 130. The light source module 110 is used to provide a laser beam L1. The light source module 110 includes, for example, a plurality of laser diodes (LD). For example, in this embodiment, the plurality of laser diodes are blue laser diodes, thus providing a blue laser beam L1.

[0057] The plurality of optical elements 120 are disposed on the transmission path of the laser beam L1 and are located between the light source module 110 and the wavelength conversion element 130. The plurality of optical elements 120 include a beam splitter 122 and at least one lens 124, wherein the at least one lens 124 is located between the beam splitter 122 and the wavelength conversion element 130. In other words, the at least one lens 124 is a focusing lens disposed between the beam splitter 122 and the wavelength conversion element 130, and is used to focus the laser beam L1 onto the wavelength conversion element 130. The at least one lens 124 includes a first lens 210 and / or a second lens 220. For example, in the present embodiment, the at least one lens 124 is two lenses, including a first lens 210 and a second lens 220, wherein the first lens 210 is located between the second lens 220 and the wavelength conversion element 130, and the optical effective diameter of the first lens 210 is larger than the optical effective diameter of the second lens 220, wherein the optical effective diameter may be, for example, the diameter of the body of the first lens 210 and the diameter of the body of the second lens 220. On the other hand, the beam splitter 122 is disposed on the transmission path of the laser beam L1, and is used to guide the laser beam L1 to be transmitted to the at least one lens 124, and the laser beam L1 is transmitted to the wavelength conversion element 130 after passing through the at least one lens 124. The beam splitter 122 is, for example, a beam splitter (for example, a dichroic mirror) that allows the laser beam L1 to pass through and reflects a beam with a wavelength larger than that of the laser beam L1, but the present invention is not limited thereto.

[0058] The wavelength conversion element 130 is disposed on the transmission path of the laser beam L1 from the at least one lens 124, and is used to reflect the laser beam L1 back to the beam splitter 122 and convert the laser beam L1 into an excited beam L2 and then reflect it back to the beam splitter 122. In detail, the wavelength conversion element 130 includes, for example, a metal substrate (not numbered), on which a wavelength conversion material (such as a fluorescent material, phosphor material) is provided, and is used to convert the laser beam L1 into an excited beam L2 of a different wavelength. For example, in the present embodiment, the wavelength conversion element 130 includes, for example, at least one wavelength conversion region and an optical region, wherein the at least one conversion region is used to convert the laser beam L1 into at least one excited beam (such as yellow light or green light), and the optical region is used to reflect the laser beam L1 back to the beam splitter 122. In the present embodiment, the at least one conversion region is, for example, a yellow light conversion material, a green light conversion material, or a combination thereof, but the present invention is not limited thereto. In addition, in this embodiment, the wavelength conversion element 130 is, for example, configured with a reflective layer (not shown) on a metal substrate to reflect the excited light beam L2 and the laser light beam L1 back to the beam splitting element 122 .

[0059] Figure 3 Schematic diagram of a light splitting element according to an embodiment of the present invention. Figure 2 and Figure 3 . Figure 3 The beam splitter element 122 shown is applicable to at least Figure 2 In the lighting system 100 shown, the following description is taken as an example. It is worth mentioning that at least one of the plurality of optical elements 120 (i.e., the light splitting element 122, at least one lens 124, or any combination thereof) includes a body 300 and a light absorbing structure 310, and the body 300 has a central axis C1 (with Figure 2 ). When the laser beam L1 is incident on the body 300, a light spot is formed on the body 300, such as Figure 3 As shown, the laser beam L1, for example, forms a light spot on the surface of the body 300 of the spectroscopic element 122 facing the light source module 110, and the area where the light spot is located can be defined as the first area A1, wherein the first area A1 is located on one side of the central axis C1 of the body 300, and the other side of the central axis C1 of the body 300 has a second area A2. In other words, when the lighting system 100 is in operation, the temperature of the first area A1 will easily be higher than the temperature of the second area A2. Among them, the light absorbing structure 310 is distributed on at least a portion of the edge of the body 300 and is adjacent to the second area A2 (i.e., an area with a lower temperature). For example, in the present embodiment, at least one of the multiple optical elements 120 is a spectroscopic element 122, and the light absorbing structure 310 is also distributed on the entire edge of the body 300, such as Figure 3In this embodiment, since the temperature of the second area A2 is lower than that of the first area A1, more light absorbing structures 310 are coated near the edge of the second area A2, so that the overall temperature of the light splitting element 122 is more balanced, which can avoid cracking due to temperature difference, thereby improving the stability of the element and having good optical quality.

[0060] FIG. 4A to FIG. 4C These are schematic diagrams of light absorption structures on the body according to different embodiments of the present invention. FIG. 4A to FIG. 4C In this embodiment, the light absorption structures 310A, 310B, and 310C can be formed on the body 300 by coating or sputtering a dark material to absorb stray light at the corresponding edges, and the distribution density of the light absorption structures 310A, 310B, and 310C gradually decreases from the edge of the body 300 toward the central axis of the body 300. The light absorption structure 310A, for example, is an arbitrary pattern of different sizes (such as Figure 4A ), or the light absorption structure 310B adopts a continuous pattern with a variable area (such as Figure 4B ), or the light absorbing structure 310C changes the coating concentration to change the material density (such as Figure 4C As shown). In this way, the light absorbing structure 310 can absorb stray light and increase the corresponding edge temperature, thereby preventing the optical element from breaking due to temperature difference, thereby improving the stability of the optical element and having good optical quality. In addition, the light absorbing structure 310 can be, for example, high temperature resistant paint, graphite coating, metal nitride, metal carbide, metal oxide, metal boride, other metal alloys and compounds, as long as the light absorption rate is greater than 10%, all materials can be used.

[0061] Figure 5A Schematic diagram of a focusing lens according to an embodiment of the present invention. Figure 2 and Figure 5A . Figure 5A The at least one lens 124 shown is applicable to at least Figure 2 In the lighting system 100 shown, the following description takes this as an example. In another embodiment, when at least one of the plurality of optical elements is at least one lens 124 (i.e., the first lens 210 and / or the second lens 220), the light absorption structure 310 is not distributed on at least another portion of the edge of the body 300 of the at least one lens 124, and at least another portion is adjacent to the first area A1. In other words, on the first lens 210 and / or the second lens 220, the light absorption structure 310 is only distributed on the edge of the second area A2 of the body 300, such as Figure 5A Therefore, the temperature of the relatively low temperature region in the first lens 210 and / or the second lens 220 can be increased by the light absorption structure 310, thereby preventing the first lens 210 and / or the second lens 220 from being broken due to the temperature difference.

[0062] Figure 6 Schematic diagram of a collimating lens according to an embodiment of the present invention. Figure 2 and Figure 6 . Figure 6 The at least one collimating lens 140 shown can be used at least Figure 2 In the lighting system 100 shown, this is used as an example in the following description. In another embodiment, the lighting system 100 further includes at least one collimating lens 140, which is disposed on the transmission path of the laser beam L1 and is located between the light source module 110 and the beam splitter 122. Specifically, in this embodiment, the number of the collimating lenses 140 is two, and each collimating lens 140 includes a body 300A and a light absorbing structure 310A', and the light absorbing structure 310A' is distributed on at least a portion of the edge of the body 300A. In detail, when the laser beam L1 is incident on the body 300A along the central axis C2 of the body 300A of the two collimating lenses 140, a light spot is formed on the body 300A, and the area where the light spot is located is defined as the central area A3, and the light absorbing structure 310A' is only disposed on the edge of the body 300A away from the central area A3. As shown in the figure, the laser beam L1, for example, forms a light spot on the surface of the body of the collimating lens 140 facing the light source module 110. Specifically, in this embodiment, the central area A3 is, for example, a rectangle, and the light absorption structure 310A′ is disposed outside the long side of the rectangle. Figure 6 In this embodiment, the light absorbing structure 310A' of each collimating lens 140 is configured on the body 300A in the same manner as FIG. 4A to FIG. 4C The configuration of the light absorption structure 310A (using arbitrary patterns of different sizes), the light absorption structure 310B (using continuous patterns with varying areas), or the light absorption structure 310C (using coating concentration variations to change material density) is the same.

[0063] Figure 5B Schematic diagram of another focusing lens according to an embodiment of the present invention. Figure 2 Matching Figure 5B . Figure 5B The condenser lens 150 shown can be applied to Figure 2 The lighting system 100 is shown, so the following description is taken as an example. Figure 2In the embodiment of the present invention, the lighting system 100 further includes a condenser lens 150 and a light homogenizing element 160. The condenser lens 150 is disposed on the transmission path of the stimulated light beam L2 from the beam splitter 122, and the light homogenizing element 160 is disposed on the transmission path of the stimulated light beam L2 from the condenser lens 150 and the laser light beam L1. The condenser lens 150 is disposed between the beam splitter 122 and the light homogenizing element 160. The condenser lens 150 includes a body 300B and a light absorbing structure 310B'. When the laser light beam L1 is incident on the body 300B, a light spot is formed on the body 300B, which is located on both sides of the central axis C3 of the body 300B. The area where the light spot is located can be defined as a first area A1' and a second area A2'. As shown in the figure, the laser light beam L1 forms a light spot on the surface of the body of the condenser lens 150 facing the beam splitter 122. In this embodiment, the light absorption structure 310B' of the focusing lens 150 is distributed on the short sides of the area on both sides of the main body 300B away from the central axis C3, that is, away from the short sides of the first area A1' and the second area A2'. In this way, the temperature of the relatively low temperature area in the focusing lens 150 can be increased by the light absorption structure 310B', thereby preventing the focusing lens 150 from being broken due to temperature difference. In this embodiment, the light absorption structure 310B' of the focusing lens 150 is configured on the main body 300B in the same manner as FIG. 4A to FIG. 4C The configuration of the light absorption structure 310A (using arbitrary patterns of different sizes), the light absorption structure 310B (using continuous patterns with varying areas), or the light absorption structure 310C (using coating concentration variations to change material density) is the same.

[0064] The light homogenizing element 160 is used to adjust the spot shape of the illumination light beam LB so that the spot shape of the illumination light beam LB can match the light valve 60 (eg Figure 1 The shape of the working area of ​​the display (e.g., rectangular) is selected so that the light intensity of each spot is consistent or close, and the light intensity of the illumination light beam LB is uniform. The illumination light beam LB includes, for example, at least one of the laser light beam L1 and the excited light beam L2 from the beam splitter 122. In this embodiment, the light homogenizing element 160 is, for example, an integrating rod, but in other embodiments, the light homogenizing element 160 may also be other appropriate types of optical elements, such as a lens array (fly eye lens array), and the present invention is not limited thereto.

[0065] Figure 7 This is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 7 The lighting system 100A shown in this embodiment is similar to Figure 2The illumination system 100 is shown. The difference between the two is that in this embodiment, the wavelength conversion element 130A is a transmissive wavelength conversion color wheel for allowing the laser beam L1 to pass through and converting the laser beam L1 into an excited beam L2 and then reflecting it back to the beam splitter 122A. In detail, in the present embodiment, a plurality of optical elements (120, 140, 150) are arranged on the transmission path of the laser beam L1 and are located between the light source module 110 and the wavelength conversion element 130A, wherein the plurality of optical elements (120, 140, 150) described in the present embodiment include a beam splitter 122A (120), at least one first lens 124A (120), at least one second lens 140 and at least one third lens 150, wherein the at least one first lens 124A is located between the beam splitter 122A and the wavelength conversion element 130A, the at least one second lens 140 is located between the light source module 110 and the beam splitter 122A, and the at least one third lens 150 is located between the beam splitter 122A and the light homogenizing element 160. The beam splitter 122A is disposed on the transmission path of the laser beam L1 to guide the laser beam L1 passing through the at least one second lens 140 to be transmitted to the at least one first lens 124A. The laser beam L1 passes through the at least one first lens 124A and then is transmitted to the wavelength conversion element 130A. The wavelength conversion element 130A is disposed on the transmission path of the laser beam L1 from at least one first lens 124A. The wavelength conversion area of ​​the wavelength conversion element 130A having a wavelength conversion material is configured as a reflection area, for example, a reflection layer (not shown) is configured under the wavelength conversion material, so as to convert the laser beam L1 into an excited beam L2 and then reflect it back to the beam splitter 122A. The area of ​​the wavelength conversion element 130A without a wavelength conversion material is configured as a light transmission area, for example, by digging a hole in the element or configuring a glass transparent member (not shown) in the light transmission area, so as to allow the laser beam L1 to pass through the wavelength conversion element 130A and then be transmitted to the light transmission component 170. The light transmission component 170 is used to guide the laser beam L1 to be transmitted back to the beam splitter 122A, so as to continue to be transmitted through at least one third lens 150 and the light homogenizing element 160. In addition, in the present embodiment, at least one first lens 124A is configured as a reflection area of ​​the wavelength conversion element 130A. Figure 2 The embodiment also comprises a focusing lens, at least one second lens 140 and Figure 2 The embodiment is also a collimating lens, at least one third lens 150 Figure 2 The embodiment of is also a focusing lens. Among them, the light absorption structure of at least one second lens 140 (collimating lens) is as follows Figure 6 (Light absorption structure 310A'), which is only distributed on both sides of the first area (central area A3) of the body (the light absorption structure 310A' is arranged outside the long side of the rectangle).

[0066] Figure 8 This is a schematic diagram of a light splitting element according to another embodiment of the present invention. Figure 7 and Figure 8 . Figure 8 The beam splitter element 122A shown is applicable to at least Figure 7 In the lighting system 100A shown, the following description is taken as an example. It is worth mentioning that in this lighting system 100A, since the wavelength conversion element 130A is a transmissive optical element, it can be further designed to transmit the laser beam L1 along the central axis C1' of the body 300A' of the light splitting element 122A to the body 300A', forming a light spot on the body 300A', and the area where the light spot is located is defined as the central area A3', and the light absorption structure 310A" is distributed all over the edge of the body 300A', such as Figure 8 As shown. In this way, the light absorbing structure 310A" can increase the temperature of the edge area of ​​the light splitting element 122A, thereby preventing the light splitting element 122A from breaking due to temperature difference. In this embodiment, the light absorbing structure 310A" of the light splitting element 122A can be configured on the body 300A' in the same manner as FIG. 4A to FIG. 4C The configuration modes include the light absorption structure 310A (using arbitrary patterns of different sizes), the light absorption structure 310B (using continuous patterns with varying areas), or the light absorption structure 310C (using coating concentration variations to change material density).

[0067] Fig. 9 This is a schematic diagram of a focusing lens according to another embodiment of the present invention. Figure 7 and Fig. 9 . Fig. 9 The first lens 124A or the third lens 150 shown can be applied to at least Figure 7 In the lighting system 100A shown, this is used as an example in the following description. The central axis of the first lens 124A is C1', and the central axis of the third lens is C2'. Since the laser light beam L1 is transmitted and incident along the central axis C1' of the body 300A' of the spectroscopic element 122A, the laser light beam L1 will also be transmitted and incident along the central axis C1' of the body 300B' of the first lens 124A or the central axis C2' of the body 300B' of the third lens 150 to the body 300B', and form a light spot on the body 300B', and the area where the light spot is located is defined as the central area A3', and the light absorption structure 310B" is distributed on the entire edge of the body 300B', as shown in FIG. Fig. 9 As shown. In this way, the temperature of the edge region of the first lens 124A or the third lens 150 can be increased by the light absorption structure 310B″, thereby preventing the first lens 124A or the third lens 150 from being broken due to temperature difference.

[0068] Please continue to refer to Figure 7 and Fig. 9 . Fig. 9The light transfer lens 230 shown is applicable to at least Figure 7 The lighting system 100A is shown, so the following description takes this as an example. In the present embodiment, the light transfer component 170, for example, includes a plurality of light transfer lenses 230 and a reflector 240, which are used to change the transmission path of the laser light beam L1, and guide the laser light beam L1 back to the beam splitter element 122A, and then transmit it through the beam splitter element 122A and transmit it to the light homogenizing element 160. It is worth mentioning that in the present embodiment, these light transfer lenses 230 can be similar to the design of the first lens 124A or the third lens 150, and are configured with a light absorbing structure 310B" on the main body 300B', and the light absorbing structure 310B" is distributed on the entire edge of the main body 300B', such as Fig. 9 As shown. In this way, the temperature of the edge area of ​​the light transfer lens 230 can be increased by the light absorption structure 310B", thereby preventing the light transfer lens 230 from breaking due to temperature difference. In this embodiment, the light absorption structure 310B" of the first lens 124A, the third lens 150 or the light transfer lens 230 can be configured on the body 300B' in the same manner as FIG. 4A to FIG. 4C The configuration modes include the light absorption structure 310A (using arbitrary patterns of different sizes), the light absorption structure 310B (using continuous patterns with varying areas), or the light absorption structure 310C (using coating concentration variations to change material density).

[0069] In summary, in the lighting system and projection device of the present invention, the lighting system includes a light source module, a plurality of optical elements and a wavelength conversion element. The plurality of optical elements include a beam splitter and at least one lens, and at least one of the plurality of optical elements includes a body and a light absorbing structure, and the light absorbing structure is distributed on at least a portion of the edge of the body. In this way, the light absorbing structure can absorb stray light and increase the temperature of the corresponding edge, thereby preventing the optical element from being broken due to temperature difference, thereby improving the stability of the optical element and having good optical quality.

[0070] However, the above is only a preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the claims and the content of the invention of the present invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and title (invention name) are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit on the number of elements.

Claims

1. A lighting system, characterized in that: The lighting system comprises a light source module, a plurality of optical elements and a wavelength conversion element, wherein: The light source module is used to provide a laser beam; The plurality of optical elements are arranged on the transmission path of the laser beam and are located between the light source module and the wavelength conversion element, wherein the plurality of optical elements include a beam splitter and at least one lens, wherein: The at least one lens is located between the beam splitting element and the wavelength conversion element; and The beam splitter is disposed on the transmission path of the laser beam, and is used to guide the laser beam to be transmitted to the at least one lens, and the laser beam is transmitted to the wavelength conversion element after passing through the at least one lens; The wavelength conversion element is disposed on the transmission path of the laser beam from the at least one lens, and is used to reflect the laser beam back to the beam splitter element and convert the laser beam into an excited beam and then reflect it back to the beam splitter element; Among them, at least one of the spectroscopic element and the at least one lens includes a body and a light absorbing structure. When the laser beam is incident on the body, a light spot is formed on the body, and the area where the light spot is located is defined as a first area. The first area is located on one side of the central axis of the body, and the other side of the central axis of the body has a second area. The light absorbing structure is distributed on at least a portion of the edge of the body, and the at least a portion is adjacent to the second area.

2. The lighting system according to claim 1, characterized in that The light absorbing structure is distributed on the entire edge of the body of the light splitting element.

3. The lighting system according to claim 1, characterized in that The light absorption structure is not distributed in at least another portion of the edge of the body of the at least one lens, and the at least another portion is adjacent to the first region.

4. The lighting system according to claim 1, characterized in that The distribution density of the light absorbing structures gradually decreases from the edge of the body toward the central axis of the body.

5. The lighting system according to claim 1, characterized in that: The lighting system also includes at least one collimating lens, which is configured on the transmission path of the laser beam and located between the light source module and the beam splitter. Each of the at least one collimating lenses includes a body and a light absorbing structure, and the light absorbing structure is distributed on at least a portion of the edge of the body.

6. The lighting system according to claim 5, characterized in that When the laser beam is incident on the body along the central axis of the body, a light spot is formed on the body, and the area where the light spot is located is defined as the central area. The light absorption structure is only configured on the edge of the body away from the central area.

7. The lighting system according to claim 1, characterized in that The lighting system also includes a focusing lens, which is arranged on the transmission path of the stimulated light beam from the spectroscopic element. The focusing lens includes a main body and a light absorbing structure. When the laser light beam is incident on the main body, a light spot is formed in the area on both sides of the central axis of the main body. The light absorbing structure is distributed on the short sides of the area on the main body away from both sides of the central axis.

8. The lighting system according to claim 7, characterized in that The lighting system further comprises a light homogenizing element, and the condensing lens is arranged between the light splitting element and the light homogenizing element.

9. A lighting system, characterized in that: The lighting system comprises a light source module, a plurality of optical elements, a wavelength conversion element and a light homogenization element, wherein: The light source module is used to provide a laser beam; The plurality of optical elements are arranged on the transmission path of the laser beam and are located between the light source module and the wavelength conversion element, wherein the plurality of optical elements include a beam splitter and a lens group, wherein: The lens group includes at least one first lens, at least one second lens and at least one third lens, wherein the at least one first lens is located between the beam splitter element and the wavelength conversion element, the at least one second lens is located between the light source module and the beam splitter element, and the at least one third lens is located between the beam splitter element and the light homogenizing element; and The beam splitter is disposed on the transmission path of the laser beam, and is used to guide the laser beam passing through the at least one second lens to be transmitted to the at least one first lens, and the laser beam is transmitted to the wavelength conversion element after passing through the at least one first lens; The wavelength conversion element is disposed on the transmission path of the laser beam from the at least one first lens, and is used to allow the laser beam to pass through and convert the laser beam into an excited beam and then reflect it back to the beam splitter element, and the beam splitter element then guides the excited beam to the at least one third lens and then to the light homogenizing element; Among them, at least one of the spectroscopic element and the lens group includes a main body and a light absorbing structure. When the laser beam is incident on the main body, a light spot is formed on the main body, and the area where the light spot is located is defined as a first area, wherein the central axis of the main body passes through the first area, and the light absorbing structure is distributed on the edge of the main body away from the first area.

10. The lighting system according to claim 9, characterized in that The light absorption structure is distributed around the entire edge of the body, or the light absorption structure is only distributed on two sides of the first area of ​​the body.

11. The lighting system according to claim 9, characterized in that The distribution density of the light absorbing structures gradually decreases from the edge of the body toward the central axis of the body.

12. A projection device, characterized in that: The projection device comprises an illumination system, a light valve and a projection lens, wherein: The lighting system is used to provide an illumination beam, and the lighting system includes a light source module, a plurality of optical elements and a wavelength conversion element, wherein: The light source module is used to provide a laser beam; The plurality of optical elements are arranged on the transmission path of the laser beam and are located between the light source module and the wavelength conversion element, wherein the plurality of optical elements include a beam splitter and at least one lens, wherein: The at least one lens is located between the beam splitting element and the wavelength conversion element; and The beam splitter is disposed on the transmission path of the laser beam, and is used to guide the laser beam to be transmitted to the at least one lens, and the laser beam is transmitted to the wavelength conversion element after passing through the at least one lens; and The wavelength conversion element is disposed on the transmission path of the laser beam from the at least one lens, and is used to reflect the laser beam back to the beam splitter element and convert the laser beam into an excited beam and then reflect it back to the beam splitter element; Wherein, at least one of the beam splitter and the at least one lens comprises a body and a light absorbing structure, when the laser beam is incident on the body, a light spot is formed on the body, and the area where the light spot is located is defined as a first area, the first area is located on one side of the central axis of the body, and the other side of the central axis of the body has a second area, wherein the light absorbing structure is distributed on at least a portion of the edge of the body, and the at least a portion is adjacent to the second area; The light valve is disposed on the transmission path of the illumination light beam, and is used to convert the illumination light beam into an image light beam; and The projection lens is arranged on the transmission path of the image light beam and is used for projecting the image light beam out of the projection device.

13. The projection device according to claim 12, characterized in that: The light absorbing structure is distributed on the entire edge of the body of the light splitting element.

14. The projection device according to claim 12, characterized in that: The light absorption structure is not distributed in at least another portion of the edge of the body of the at least one lens, and the at least another portion is adjacent to the first region.

15. The projection device according to claim 12, characterized in that: The distribution density of the light absorbing structures gradually decreases from the edge of the body toward the central axis of the body.

16. The projection device according to claim 12, characterized in that: The lighting system also includes at least one collimating lens, which is configured on the transmission path of the laser beam and located between the light source module and the beam splitter. Each of the at least one collimating lenses includes a body and a light absorbing structure, and the light absorbing structure is distributed on at least a portion of the edge of the body.

17. The projection device according to claim 16, characterized in that: When the laser beam is incident on the body along the central axis of the body, a light spot is formed on the body, and the area where the light spot is located is defined as the central area. The light absorption structure is only configured on the edge of the body away from the central area.

18. The projection device according to claim 12, characterized in that: The lighting system also includes a focusing lens, which is arranged on the transmission path of the stimulated light beam from the spectroscopic element. The focusing lens includes a main body and a light absorbing structure. When the laser light beam is incident on the main body, a light spot is formed in the area on both sides of the central axis of the main body. The light absorbing structure is distributed on the short sides of the area on the main body away from both sides of the central axis.

19. The projection device according to claim 18, characterized in that: The lighting system further comprises a light homogenizing element, and the condensing lens is arranged between the light splitting element and the light homogenizing element.

20. A projection device, characterized in that: The projection device comprises an illumination system, a light valve and a projection lens, wherein: The lighting system is used to provide an illumination beam, and the lighting system includes a light source module, a plurality of optical elements, a wavelength conversion element, and a light homogenization element, wherein: The light source module is used to provide a laser beam; The plurality of optical elements are arranged on the transmission path of the laser beam and are located between the light source module and the wavelength conversion element, wherein the plurality of optical elements include a beam splitter and a lens group, wherein: The lens group includes at least one first lens, at least one second lens and at least one third lens, wherein the at least one first lens is located between the beam splitter element and the wavelength conversion element, the at least one second lens is located between the light source module and the beam splitter element, and the at least one third lens is located between the beam splitter element and the light homogenizing element; and The beam splitter is disposed on the transmission path of the laser beam, and is used to guide the laser beam passing through the at least one second lens to be transmitted to the at least one first lens, and the laser beam is transmitted to the wavelength conversion element after passing through the at least one first lens; The wavelength conversion element is disposed on the transmission path of the laser beam from the at least one first lens, and is used to allow the laser beam to pass through and convert the laser beam into an excited beam and then reflect it back to the beam splitter element, and the beam splitter element then guides the excited beam to the at least one third lens and then to the light homogenizing element; Wherein, at least one of the beam splitter and the lens group includes a body and a light absorbing structure, and when the laser beam is incident on the body, a light spot is formed on the body, and the area where the light spot is located is defined as a first area, wherein the central axis of the body passes through the first area, and the light absorbing structure is distributed on the edge of the body away from the first area; The light valve is disposed on the transmission path of the illumination light beam, and is used to convert the illumination light beam into an image light beam; and The projection lens is arranged on the transmission path of the image light beam and is used for projecting the image light beam out of the projection device.

21. The projection device according to claim 20, characterized in that: The light absorption structure is distributed around the entire edge of the body, or the light absorption structure is only distributed on two sides of the first area of ​​the body.

22. The projection device according to claim 20, characterized in that: The distribution density of the light absorbing structures gradually decreases from the edge of the body toward the central axis of the body.

Images