Illumination system and projection device

Abstract

A lighting system includes a light source module and a light guide assembly. The light source module includes a first light source module providing a first light beam in a first direction, and a second light source module and a third light source module providing a second light beam and a third light beam in a second direction. The light guiding assembly comprises a first light splitting element, a second light splitting element and a reflecting mirror. The first light splitting element transmits the third light beam and the second light beam along the second direction. The second light splitting element transmits the first light beam, the second light beam and the third light beam along the second direction. The reflecting mirror guides the third light beam to the first light splitting element. The first light splitting element and the second light splitting element are stripe spectroscopes, and stripe extension directions of the two light splitting elements are orthogonal to each other. The invention also provides a projection device. The lighting system and the projection device can effectively improve the light efficiency of the plurality of light source modules.

Description

Technical Field

[0001] The present invention relates to an optical system and an optical device, and more particularly to an illumination system and a projection device. Background Art

[0002] Recently, projection devices based on solid-state light sources such as light-emitting diodes (LEDs) and laser diodes (LDs) have gradually gained a foothold in the market.

[0003] As the density of light-emitting units in solid-state light sources increases, how to effectively utilize the light beams emitted by the light-emitting units or optimize and improve the light collection efficiency of optical components has become a problem that needs to be solved.

[0004] The "Background" section is intended only to facilitate understanding of the present invention. Therefore, the information disclosed in this section may contain information that is not already known to those skilled in the art. The information disclosed in this section does not imply that the information or the problems to be solved by one or more embodiments of the present invention were known or understood by those skilled in the art prior to the filing of this application. Summary of the Invention

[0005] The present invention provides a lighting system, which can effectively improve the light efficiency of multiple light source modules.

[0006] The present invention provides a projection device, the illumination system of which has a small volume and good light extraction efficiency.

[0007] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0008] In order to achieve one or part or all of the above-mentioned purposes or other purposes, one embodiment of the present invention provides a lighting system including a light source module and a light guide component. The light source module includes a first light source module that provides a first light beam in a first direction, a second light source module and a third light source module that provide a second light beam and a third light beam in a second direction. The first light source module and the second light source module, as well as the second light source module and the third light source module are offset from each other in a third direction. Any two of the first direction, the second direction and the third direction are perpendicular to each other. The light guide component includes a first beam splitter, a second beam splitter and a reflector. The first beam splitter is used to allow the second light beam to pass through, reflect the third light beam, and allow the third light beam and the second light beam to both be transmitted along the second direction. The second beam splitter is used to allow the second light beam to pass through, and allow the first light beam, the second light beam and the third light beam to both be transmitted along the second direction. The reflector guides the third light beam to the first beam splitter. The first beam splitter and the second beam splitter are stripe beam splitters, and the stripe extension directions of the two beam splitters are orthogonal to each other.

[0009] To achieve one, some, or all of the above objectives, or other objectives, one embodiment of the present invention provides a projection device comprising the aforementioned illumination system, a light valve, and a projection lens. The illumination system is configured to provide an illumination beam, which includes at least one of a first light beam, a second light beam, and a third light beam. The light valve is disposed in the transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is disposed in the transmission path of the image beam to project the image beam out of the projection device.

[0010] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiments of the present invention, by virtue of the first and second beam splitting elements being stripe beam splitters, and the stripe extension directions of the two being orthogonal to each other, the optical paths of the light beams from the first light source module and the second light source module, which come from two different light emitting directions, can be effectively integrated. Furthermore, a reflector is used to guide the light beam of the third light source module, so that the light spots formed on the optical element by the light beams emitted by each of the three light source modules can be densely arranged. The light beams generated by the light source modules arranged in different directions can be emitted in the same direction after passing through the light guiding assembly, thereby reducing the complexity of the light path design of multiple light source modules and further saving the space required for the lighting system (or projection device).

[0011] 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

[0012] Figure 1 FIG. 1 is a schematic diagram of the architecture of a lighting system according to an embodiment of the present invention.

[0013] Figure 2 yes Figure 1Schematic diagram of a light source module and a light guide component of an illumination system.

[0014] Figure 3 yes Figure 1 Schematic diagram of the light path of the lighting system.

[0015] Figure 4 yes Figure 1 A schematic front view of the first beam splitting element and the second beam splitting element.

[0016] Figure 5A yes Figure 1 Schematic diagram of the architecture of the light source module.

[0017] Figure 5B yes Figure 5A Schematic diagram of the light spot distribution formed on the focusing lens of the light source module.

[0018] Figure 6 FIG. 1 is a schematic diagram of the architecture of a lighting system according to an embodiment of the present invention.

[0019] Figure 7 yes Figure 6 Schematic diagram of a light source module and a light guide component of an illumination system.

[0020] Figure 8 yes Figure 6 Schematic diagram of the light path of the lighting system.

[0021] Figure 9A yes Figure 6 Schematic diagram of the architecture of the light source module.

[0022] Figure 9B yes Figure 9A Schematic diagram of the light spot distribution formed on the focusing lens of the light source module.

[0023] Figure 10A and Figure 10B FIG. 4 is a schematic diagram of the structure of a heat dissipation module according to an embodiment of the present invention.

[0024] Figure 11 FIG. 1 is a schematic diagram of the structure of a projection device according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1: Projection device

[0027] 10A, 10B: Lighting system

[0028] 20: Light source module

[0029] 30: Light guide assembly

[0030] 100A: First light source module

[0031] 100B: Second light source module

[0032] 100C: Third light source module

[0033] 101: Light-emitting components

[0034] 110A: First beam splitter

[0035] 110B: Second beam splitter

[0036] 111A: First Stripe

[0037] 111B: Second stripe

[0038] 120: Reflector

[0039] 140: Collimating lens

[0040] 150: Diffuser

[0041] 160: Color separation component

[0042] 171,172,173,174: Focusing lenses

[0043] 180: Fluorescent wheel

[0044] 181: Light conversion zone

[0045] 182: Reflection area

[0046] 190: Depolarizing element

[0047] 200: Filter wheel

[0048] 201, 202, 203: filter area

[0049] 204: Translucent area

[0050] 210: Light homogenization element

[0051] 220: Holding piece

[0052] 300A: First heat dissipation module

[0053] 300B: Second heat dissipation module

[0054] 301: Circuit board

[0055] 310A, 310B: heat sink fins

[0056] 320: Heat pipe

[0057] 330: Cooling pad

[0058] 340: Support seat

[0059] 400: Light valve

[0060] 500: Projection lens

[0061] CB: Combined Beam

[0062] D1, D2, D3, D4, D5: Direction

[0063] d: distance

[0064] G12, G12', G13, G13', G23, G23': Spacing

[0065] FB: Switched Beam

[0066] IB: Illumination beam

[0067] IM: Image Beam

[0068] L1: First beam

[0069] L2: Second beam

[0070] L3: The third beam

[0071] LD: light emitting unit

[0072] RE: Optical Components

[0073] R1, R2, R3, R4: Reflection area

[0074] T1, T2, T3, T4: penetration zone

[0075] WT1,WT2,WT3,WT4,WR1,WR2,WR3,WR4: Width

[0076] θ: angle. DETAILED DESCRIPTION

[0077] The aforementioned technical contents, features, and functions of the present invention will be more clearly understood in the following detailed description of a preferred embodiment with reference to the accompanying drawings. Directional terms such as up, down, left, right, front, and back mentioned in the following embodiments are merely references to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present invention.

[0078] Figure 1 This is a schematic diagram of the structure of a lighting system according to an embodiment of the present invention. Figure 1The lighting system 10A includes a light source module 20 and a light guide assembly 30. The light guide assembly 30 is disposed in the transmission path of the light beam from the light source module 20 and includes a first beam splitter 110A, a second beam splitter 110B, and a reflector 120. The light source module 20 may include a first light source module 100A, a second light source module 100B, and a third light source module 100C. In one embodiment, the lighting system 10A may further include other optical components, such as focusing lenses 171-174, a collimating lens 140, a diffuser 150, a dichroic element 160, a fluorescent wheel 180, a depolarizer 190, a filter wheel 200, and a light homogenizing element 210.

[0079] The first light source module 100A, the second light source module 100B, and the third light source module 100C can all be identical light source modules, emitting light beams with the same wavelength range. In other embodiments, the first light source module 100A, the second light source module 100B, and the third light source module 100C can be configured to provide light beams with at least two different wavelength ranges. Each of the above light source modules can include four light-emitting components 101 arranged in a 2x2 array. In other embodiments, each of the above light source modules can include only two light-emitting components 101 arranged in the first direction D1, the second direction D2, or the third direction D3. The light-emitting components 101 can be packages for light-emitting diodes, laser diodes, or packages consisting of both light-emitting diodes and laser diodes. Each light-emitting component 101 can include three to eight light-emitting diodes, laser diodes, or a combination thereof. In this embodiment, each light-emitting component 101 can include, for example, four or five blue laser diodes.

[0080] In this embodiment, the first light source module 100A provides a first light beam L1 along a first direction D1, the second light source module 100B provides a second light beam L2 along a second direction D2, and the third light source module 100C provides a third light beam L3 along the second direction D2. The first light source module 100A and the second light source module 100B are offset from each other in a third direction D3, and the second light source module 100B and the third light source module 100C are offset from each other in the third direction D3. For example, the second light source module 100B and the third light source module 100C can be of the same size and both are located on a reference plane defined by the first direction D1 and the third direction D3. The offset creates a distance d between the two light source modules in the third direction D3. In this embodiment, the first direction D1, the second direction D2, and the third direction D3 can be perpendicular to each other, and the third direction D3 can be parallel to the direction of gravity, for example. The orthographic projections of the first light source module 100A, the second light source module 100B, and the third light source module 100C on a reference plane perpendicular to the second direction D2 do not overlap. The orthographic projections of the second light source module 100B and the third light source module 100C on a reference plane perpendicular to the first direction D1 at least partially overlap. In other embodiments, the third direction D3 and the first direction D1 may be horizontal, the second direction D2 may be vertical, and the light source modules 20 or the overall lighting system 10A may be rotated 90 degrees.

[0081] The first beam splitter 110A is configured to allow the second light beam L2 from the second light source module 100B to pass through and guide the third light beam L3 from the third light source module 100C to be transmitted along the second direction D2. The second beam splitter 110B is configured to allow the second light beam L2 from the first beam splitter 110A to pass through and allow the first light beam L1, the second light beam L2, and the third light beam L3 to be transmitted in the second direction D2. The first beam splitter 110A and the second beam splitter 110B are stripe mirrors. The extension plane of the first beam splitter 110A can be parallel to the fifth direction D5, and the extension plane of the second beam splitter 110B can be parallel to the fourth direction D4. The fifth direction D5 and the fourth direction D4 are, for example, parallel to a plane formed by the first direction D1 and the second direction D2. The fifth direction D5 and the fourth direction D4 can each be orthogonal to the third direction D3.

[0082] The stripe spectrometer has a reflection area and a transmission area, and the reflection area and the transmission area are arranged in a stripe shape. The reflection area is, for example, an area having a material with high reflectivity for electromagnetic waves of a specific wavelength (such as a Bragg reflector or silver). The transmission area is, for example, an area having a material with high transmittance for electromagnetic waves of a specific wavelength (such as glass, quartz, sapphire substrate), or the transmission area is an air layer without a substrate. The first spectrometer element 110A is, for example, a stripe spectrometer extending in the fifth direction D5 and having a width in the third direction D3. The extension direction of the second spectrometer element 110B is, for example, parallel to the third direction D3, and the second spectrometer element 110B is a stripe spectrometer having a width in the fourth direction D4. The first spectrometer element 110A is, for example, a stripe spectrometer with horizontal stripes, and the second spectrometer element 110B is, for example, a stripe spectrometer with vertical stripes. In other embodiments, the first spectrometer element 110A may also be a stripe spectrometer with vertical stripes, and the second spectrometer element 110B may be a stripe spectrometer with horizontal stripes.

[0083] The extension plane of the first beam splitter element 110A and the extension plane of the second beam splitter element 110B form an angle θ in a direction away from the first light source module 100A. The angle θ ranges from greater than 0 degrees to less than 180 degrees. On a reference plane perpendicular to the third direction D3, the orthographic projections of the first beam splitter element 110A and the second beam splitter element 110B form an inverted V-shape. On a reference plane perpendicular to the first direction D1, the orthographic projections of the second beam splitter element 110B and the first light source module 100A at least partially overlap, and the orthographic projection of the reflector 120 and the orthographic projection of the first beam splitter element 110A at least partially overlap. For example, the extension plane of the first beam splitter element 110A can have an angle of 45 degrees with the plane where the second light source module 100B and the third light source module 100C are located (i.e., the plane formed by the first direction D1 and the third direction D3), and the extension plane of the second beam splitter element 110B can have an angle of 45 degrees with the plane where the first light source module 100A (i.e., the plane formed by the second direction D2 and the third direction D3) is located. Therefore, the angle θ can be 90 degrees. The extension plane of the reflector 120 can be parallel to the extension plane of the first beam splitter element 110A. In some embodiments, there will be tolerances during assembly of the first light source module 100A, the second light source module 100B, and the third light source module 100C. The first beam splitter element 110A and the reflector 120 can also be slightly rotated or offset to fine-tune the angle at which the light beam is directed to the second beam splitter element 110B. Therefore, the angle θ may also be an acute angle or an obtuse angle. The range of the angle θ is, for example, 80 degrees to 100 degrees, or 85 degrees to 95 degrees, or 87 degrees to 93 degrees.

[0084] Figure 2 yes Figure 1 Schematic diagram of the light source module and light guide assembly of the lighting system. Figure 2The first beam splitter 110A and the second beam splitter 110B are disposed on the transmission path of the second light beam L2 from the second light source module 100B. The first beam splitter 110A has a first transmission area T1, a second transmission area T2, a first reflection area R1, and a second reflection area R2. The second beam splitter 110B has a third transmission area T3, a fourth transmission area T4, a third reflection area R3, and a fourth reflection area R4. The second light beam L2 from the light-emitting component 101 of the second light source module 100B can be incident on the first transmission area T1 and / or the second transmission area T2 of the first beam splitter 110A, and on the third transmission area T3 and / or the fourth transmission area T4 of the second beam splitter 110B, and then transmitted to the focusing lens 171. In other words, the second light beam L2 irradiated on the focusing lens 171 enters the focusing lens 171 without being reflected by the beam splitter.

[0085] The first beam splitter 110A is used to reflect the third beam L3 so that the third beam L3 propagates along the second direction D2. The second beam splitter 110B is used to reflect the first beam L1 so that the first beam L1 propagates along the second direction D2. The reflector 120 is used to guide the third beam L3 to the first beam splitter 110A.

[0086] The second spectrometer 110B is arranged on the transmission path of the first light beam L1 from the first light source module 100A. The first light beam L1 from the light-emitting component 101 of the first light source module 100A can be incident on the third reflection area R3 and / or the fourth reflection area R4 of the second spectrometer 110B, and then reflected by the second spectrometer 110B to the focusing lens 171.

[0087] The reflector 120 is disposed on the transmission path of the third light beam L3 from the third light source module 100C. The third light beam L3 from the light-emitting component 101 of the third light source module 100C can first enter the reflector 120 along the second direction D2 and be reflected to the first reflection region R1 and / or the second reflection region R2 of the first beam splitter 110A. The third light beam L3 is then reflected by the first reflection region R1 and / or the second reflection region R2 to the second beam splitter 110B. Finally, the third light beam L3 is incident on the third transmission region R3 and / or the fourth transmission region R4 of the second beam splitter 110B along the second direction D2 to be transmitted to the focusing lens 171. The first light beam L1, the second light beam L2, and the third light beam L3 can all be guided in the second direction D2 to form a combined light beam CB. The combined light beam CB includes at least one of the first light beam L1, the second light beam L2, and the third light beam L3. The combined light beam CB includes, for example, multiple blue laser beams.

[0088] Figure 5A yes Figure 1 Schematic diagram of the architecture of the light source module. Figure 5B yes Figure 5ASchematic diagram of the light spot distribution formed on the focusing lens of the light source module. Figure 5B In the figure, the outline of the light spot is used to illustrate the distribution of multiple light spots. Please also refer to Figure 5A and Figure 5B Because the first light source module 100A and the second light source module 100B are offset in the third direction D3, the third light source module 100C and the second light source module 100B are also offset in the third direction D3. A distance G12 is defined between the center of the first light source module 100A and the center of the second light source module 100B in the third direction D3, and a distance G23 is defined between the center of the second light source module 100B and the center of the third light source module 100C in the third direction D3. The first light source module 100A and the third light source module 100C are offset in the third direction D3, with a distance G13 defined between the center of the first light source module 100A and the center of the third light source module 100C in the third direction D3. The first light source module 100A, the second light source module 100B, and the third light source module 100C can all be offset in the third direction D3. In the third direction D3, the center of the first light source module 100A is located between the center of the second light source module 100B and the center of the third light source module 100C.

[0089] In this embodiment, the spacing G23 may be greater than the spacing G12. Therefore, on the incident surface of the focusing lens 171, the light spot formed by the second light beam L2 and the third light beam L3 (eg Figure 5B The pitch of the light spot formed by the first light beam L1 and the second light beam L2 in the third direction D3 (as shown in FIG. Figure 5B L1 and L2 in the third direction D3). In this embodiment, the optical paths of the second light beam L2 and the third light beam L3 are first integrated by the first beam splitter 110A, the third light beam L3 is reflected by the reflection area of ​​the first beam splitter 110A, and the second light beam L2 penetrates the penetration area of ​​the first beam splitter 110A. Then, the optical paths of the second light beam L2 and the third light beam L3 are integrated with the optical path of the first light beam L1 by the second beam splitter 110B, the second light beam L2 and the third light beam L3 pass through the penetration area of ​​the second beam splitter 110B, and the first light beam L1 is reflected by the reflection area of ​​the second beam splitter 110B. In the first direction D1, the light spot formed by the first light beam L1 on the focusing lens 171 is alternately arranged with the light spots formed by the second light beam L2 and the third light beam L3, so that the light spots formed between the light beams are arranged as closely as possible. By matching the light source module 20 and the light guiding assembly 30 on the above-mentioned optical path, the beam density of the combined light beam CB can be effectively improved.

[0090] The plurality of light emitting components 101 of any one of the first light source module 100A, the second light source module 100B and the third light source module 100C are arranged at intervals. For example, the four light emitting components 101 of the first light source module 100A have a pitch therebetween. Figure 5A It is also schematically shown that each light emitting element 101 includes five light emitting units LD, and the five light emitting units LD are arranged in a third direction D3. The light emitting unit LD can be, for example, the aforementioned blue laser diode.

[0091] Figure 3 yes Figure 1 Schematic diagram of the light path of the lighting system. Figure 3 The combined light beam CB from the focusing lens 171 can be sequentially transmitted to the collimating lens 140, the diffuser 150, the dichroic element 160, the focusing lenses 173-174, and the fluorescent wheel 180. The fluorescent wheel 180 can sequentially convert the combined light beam CB into a converted light beam FB (e.g., fluorescent light) and reflect the combined light beam CB to the optical element RE (e.g., a reflector). The converted light beam FB and the combined light beam CB are then sequentially transmitted to the dichroic element 160, the focusing lens 172, the depolarizing element 190, the filter wheel 200, and the light homogenizing element 210.

[0092] In this embodiment, the diffuser 150 can be disposed, for example, on the side of the collimating lens 140 facing away from the focusing lens 171. The collimating lens 140 is used to align the travel direction of the combined light beam CB. The diffuser 150 is used to eliminate speckle in the combined light beam CB. The diffuser 150 can be an actuated diffuser or a diffuser wheel.

[0093] The dichroic element 160 is disposed in the transmission path of the combined light beam CB from the light source module 20 and the light guide assembly 30. The dichroic element 160 can be a dichroic element, a polarization beam splitter, or other element capable of separating light beams. For example, in this embodiment, the dichroic element 160 allows the blue light beam to pass through while reflecting light beams of other colors (such as red, green, and yellow). The dichroic element 160 allows the blue combined light beam CB to pass through and be incident on the fluorescent wheel 180.

[0094] The fluorescent wheel 180 is located in the transmission path of the combined light beam CB. The light conversion region 181 of the fluorescent wheel 180 is adapted to convert the combined light beam CB into at least one converted light beam FB. The reflective region 182 of the fluorescent wheel 180 is adapted to reflect the combined light beam CB and transmit it to the optical element RE. The fluorescent wheel 180 also includes an actuator (not shown) adapted to position the reflective region 182 and the light conversion region 181 in the transmission path of the combined light beam CB at different timings.

[0095] The depolarizing element 190 may be used to eliminate the polarization state of the combined light beam CB to reduce the generation of speckle. The depolarizing element 190 may be, for example, a depolarizer.

[0096] The filter wheel 200 is disposed in the transmission path of the combined light beam CB and the converted light beam FB from the dichroic element 160. For example, the filter wheel 200 may include a transparent substrate (not shown), filter regions 201-203 disposed on the transparent substrate, a transparent region 204, and a rotating shaft (not shown) passing through the transparent substrate. The filter regions 201-203 may, for example, be red, blue, and green filter patterns, respectively. The filter wheel 200 can rotate along its rotating shaft, so that the filter regions 201-203 are sequentially and repeatedly positioned in the transmission path of the combined light beam CB and the converted light beam FB. The filter wheel 200 can respectively shape the combined light beam CB and at least one converted light beam FB into a blue beam, a red beam, or a green beam, thereby forming an illumination beam IB. The illumination beam IB includes at least one of a blue beam, a red beam, and a green beam.

[0097] The light homogenizer 210 is disposed in the transmission path of the illumination beam IB from the filter wheel 200. The light homogenizer 210 can be disposed on the side of the filter wheel 200 facing away from the depolarizing element 190 to achieve beam shaping and homogenization of the illumination beam IB. The light homogenizer 210 can be, for example, an integrating rod or a fly-eye lens-type optical integrator.

[0098] Figure 4 yes Figure 1 The schematic diagram of the front view of the first and second beam splitting elements. Figure 4 In this embodiment, the first transmission region T1, the second reflection region R2, the second transmission region T2, and the first reflection region R1 of the first light-splitting element 110A are arranged in sequence along the third direction D3. A width WT1 of the first transmission region T1 along the third direction D3 is greater than a width WT2 of the second transmission region T2 along the third direction D3. A width WR1 of the first reflection region R1 along the third direction D3 is greater than a width WR2 of the second reflection region R2 along the third direction D3.

[0099] Since the width WR1 and the width WT1 are long, the first reflective region R1 and the first transmissive region T1 have large areas, and some areas can be used as fixing parts (eg Figure 1The clamping area of ​​the retaining member 220 in the embodiment of the present invention is formed by the first transmissive region T1. In other embodiments, the widths WR1, WR2, WT1, and WT2 can all be the same. In some embodiments, the width WT1 of the first transmissive region T1 is the same as the width WR1 of the first reflective region R1, and the width WT2 of the second transmissive region T2 is the same as the width WR2 of the second reflective region R2.

[0100] The third reflective region R3, the fourth transmissive region T4, the fourth reflective region R4, and the third transmissive region T3 of the second light-splitting element 110B are arranged sequentially in the fourth direction D4. The width WT3 of the third transmissive region T3 in the fourth direction D4 is greater than the width of the fourth transmissive region T4 in the fourth direction D4. The width WR3 of the third reflective region R3 in the fourth direction D4 is greater than the width WR4 of the fourth reflective region R4 in the fourth direction D4. In other embodiments, the widths WR3, WR4, WT3, and WT4 may all be the same. In some embodiments, the width WT3 of the third transmissive region T3 is the same as the width WR3 of the third reflective region R3, and the width WT4 of the fourth transmissive region T4 is the same as the width WR4 of the fourth reflective region R4.

[0101] In some embodiments, the width WT2 of the second transmissive region T2 and the width WR2 of the second reflective region R2 can be greater than the width WT4 of the fourth transmissive region T4 and the width WR4 of the fourth reflective region R4, respectively. Because each light-emitting element 101 has a larger light divergence angle in the third direction D3 parallel to the direction of gravity, the larger width WT2 of the second transmissive region T2 of the first beam splitter 110A facilitates the transmission of the second light beam L2. Furthermore, the larger width WR2 of the second reflective region R2 also facilitates the reflection of the third light beam L3, thereby improving the light utilization efficiency of the light guiding assembly 30. Furthermore, because each light-emitting element 101 has a larger light divergence angle in the third direction D3 parallel to the direction of gravity and a smaller light divergence angle in the first direction D1 / second direction D2, the light beams are initially integrated by the first beam splitter 110A (a striped beam splitter with horizontal stripes) and then integrated by the second beam splitter 110B (a striped beam splitter with vertical stripes), thereby improving the light collection efficiency.

[0102] Some other embodiments will be listed below to illustrate the present invention in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted. For the omitted parts, please refer to the above embodiments and will not be repeated below.

[0103] Figure 6 This is a schematic diagram of the structure of a lighting system according to an embodiment of the present invention. Figure 6 , lighting system 10B and Figure 1The illumination system 10B is similar to the illumination system 10A, with the primary difference being the configuration of the light guide assembly 30. In the illumination system 10B, the first beam splitter 110A is configured to allow the second light beam L2 to pass through and to direct the first light beam L1 along the second direction D2. The second beam splitter 110B is configured to allow the second light beam L2 to pass through and to direct the third light beam L3 along the second direction D2. The reflector 120 is configured to guide the third light beam L3 to the second beam splitter 110B.

[0104] Figure 7 yes Figure 6 Schematic diagram of a light source module and a light guide component of an illumination system. Figure 8 yes Figure 6 Schematic diagram of the light path of the lighting system. Figure 6 、 Figure 7 as well as Figure 8 The extending plane of the first light splitting element 110A and the extending plane of the second light splitting element 110B of the lighting system 10B have an included angle θ (eg, Figure 6 As shown). On a reference plane perpendicular to the third direction D3, the orthographic projections of the first beam splitter element 110A and the second beam splitter element 110B are V-shaped. On a reference plane perpendicular to the first direction D1, the orthographic projections of the first beam splitter element 110A and the first light source module 100A at least partially overlap, and the orthographic projection of the reflector 120 and the orthographic projection of the second beam splitter element 110B at least partially overlap. The first light beam L1 from the first light source module 100A can be incident on the first reflection region R1 and / or the second reflection region R2 of the first beam splitter element 110A and reflected thereby. The first light beam L1 can then be incident on the third transmission region T3 and / or the fourth transmission region T4 of the second beam splitter element 110B to be transmitted to the focusing lens 171.

[0105] The second light beam L2 from the second light source module 100B can be incident on the first transmission area T1 and / or the second transmission area T2 of the first beam splitter 110A along the second direction D2. The second light beam L2 can then be incident on the third transmission area T3 and / or the fourth transmission area T4 of the second beam splitter 110B to be transmitted to the focusing lens 171. In other words, the second light beam L2 irradiated on the focusing lens 171 enters the focusing lens 171 without being reflected by the beam splitter.

[0106] The third light beam L3 from the third light source module 100C first enters the reflector 120 along the second direction D2 and is guided along the negative first direction D1 to the third reflection region R3 and / or the fourth reflection region R4 of the second beam splitter 110B. The third light beam L3 is then reflected by the third reflection region R3 and / or the fourth reflection region R4 and transmitted along the second direction D2 to the focusing lens 171. Accordingly, at least one of the first light beam L1, the second light beam L2, and the third light beam L3 can form a combined light beam CB, which is then converted into an illumination light beam IB by the remaining optical elements in the subsequent optical path, such as Figure 8 and as described in the preceding paragraphs.

[0107] Figure 9A yes Figure 6 Schematic diagram of the architecture of the light source module. Figure 9B yes Figure 9A Schematic diagram of the light spot distribution formed on the focusing lens of the light source module. Figure 9B In the figure, the distribution positions of multiple light spots are illustrated by the outline of the light spot. The center of the first light source module 100A and the center of the second light source module 100B may have a spacing G12' in the third direction D3, and the center of the second light source module 100B and the center of the third light source module 100C may have a spacing G23' in the third direction D3. The first light source module 100A and the third light source module 100C may also be staggered in the third direction D3. The center of the first light source module 100A and the center of the third light source module 100C may have a spacing G13' in the third direction D3. In the third direction D3, the center of the third light source module 100C is located between the center of the first light source module 100A and the center of the second light source module 100B. In the lighting system 10B, the length of the spacing G23' is less than the length of the spacing G12'. Figure 9B The light spots formed by the second light beam L2 and the third light beam L3 can be seen in Figure 9B The pitch of the light spot formed by the first light beam L1 and the second light beam L2 in the third direction D3 is smaller than that of the light spot formed by the first light beam L1 and the second light beam L2 (as shown in FIG. Figure 9B(as shown by L1 and L2 in the figure) in the third direction D3. In this embodiment, the optical paths of the first and second light beams L1 and L2 are first integrated by the first beam splitter 110A. The first light beam L1 is reflected by the reflective region of the first beam splitter 110A, and the second light beam L2 passes through the transmissive region of the first beam splitter 110A. Then, the optical paths of the first and second light beams L1 and L2 are integrated with the optical path of the third light beam L3 by the second beam splitter 110B. The first and second light beams L1 and L2 pass through the transmissive region of the second beam splitter 110B, and the third light beam L3 is reflected by the reflective region of the second beam splitter 110B. The light spot formed by the third light beam L3 on the focusing lens 171 can be arranged alternately with the light spots formed by the first and second light beams L1 and L2 in the first direction D1, so that the light spots formed by each light beam are arranged as closely as possible.

[0108] Figure 10A and Figure 10B This is a schematic diagram of the heat dissipation module according to an embodiment of the present invention. Figure 10A 、 10B as well as Figure 3 or Figure 8 The lighting system 10A (or lighting system 10B) may further include a first heat dissipation module 300A and a second heat dissipation module 300B. The first light source module 100A may be mounted on the first heat dissipation module 300A, and the second light source module 100B and the third light source module 100C may both be mounted on the second heat dissipation module 300B. In other embodiments, the first light source module 100A, the second light source module 100B, and the third light source module 100C may each be equipped with a corresponding heat dissipation module for heat dissipation.

[0109] The first heat dissipation module 300A and / or the second heat dissipation module 300B may include a circuit board 301, heat dissipation fins 310A and 310B, a heat pipe 320, a heat dissipation pad 330, and a support seat 340. The first light source module 100A, the second light source module 100B, and the third light source module 100C may be disposed on the circuit board 301, and the light guide assembly 30 may be disposed in the support seat 340. The second light source module 100B and the third light source module 100C may share a circuit board 301. The heat of the light source module 20 is transferred to the heat pipe 320 via the heat dissipation pad 330, and the heat pipe 320 then transfers the heat to the heat dissipation fins 310B to conduct the heat out of the light source module 20. The heat pipe 320 is, for example, a heat pipe made of a metal material with high thermal conductivity (such as a copper pipe) coated with a heat-conducting fluid (such as water vapor) to facilitate the transfer and release of heat. Since bending the heat pipe 320 will reduce its thermal conductivity, in this embodiment, the heat pipe 320 can be bent only once to connect the heat dissipation pad 330 and the heat dissipation fins 310A, 310B to each other, so as to maximize the thermal conductivity of the first heat dissipation module 300A or the second heat dissipation module 300B.

[0110] Figure 11 This is a schematic diagram of the structure of a projection device according to an embodiment of the present invention. Figure 11 A projection device 1 (e.g., a projector) includes an illumination system 10A, a light valve 400, and a projection lens 500. The illumination system 10A is configured to provide an illumination beam IB. The light valve 400 is disposed in the transmission path of the illumination beam IB from the illumination system 10A and is configured to convert the illumination beam IB into an image beam IM. The light valve 400 may include a digital micromirror device (DMD), a reflective liquid crystal on silicon (LCoS) light valve, or a transmissive spatial light modulator (SLM), such as a transmissive liquid crystal panel.

[0111] The projection lens 500 is disposed in the transmission path of the image beam IM from the light valve 400 and is adapted to project the image beam IM from the light valve 400 out of the projection device 1 onto an imaging surface (not shown). The projection lens 500 may be any type of lens module known to those skilled in the art, and is not limited herein. The above description uses the illumination system 10A providing the illumination beam IB for use in the projection device 1. In other embodiments, the illumination system 10B may also be used to provide the illumination beam IB for use in the projection device 1.

[0112] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiments of the present invention, the first spectrometer element and the second spectrometer element are both stripe spectrometers, and the extension directions of the stripes of the two are orthogonal to each other, so that the optical paths of the light beams of the first light source module and the second light source module from two different light emitting directions can be effectively integrated. And further, a reflector is used to guide the light beam of the third light source module, so that the light beams emitted by the three light source modules can be densely arranged. The light beams generated by the light source modules arranged in different directions can be emitted in the same direction after passing through the light guiding component, which reduces the complexity of the light path design of multiple light source modules and can further save the space required for the lighting system (or projection device). In addition, the structure of the light guiding component is simple, so that the angle and / or position of the first spectrometer element, the second spectrometer element or the reflector can be easily adjusted, which also makes it easy to adjust the light path of the light beam of each light source module or the density of the light spot formed by the light beam to improve the quality of the image beam.

[0113] However, what is described above is only a preferred embodiment of the present invention, and it should not be used to limit the scope of implementation of the present invention. That is, all simple equivalent changes and modifications made in accordance with the claims and the content of the 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 to 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 includes a light source module and a light guide assembly, wherein: The light source module includes a first light source module, a second light source module and a third light source module, wherein: The first light source module provides a first light beam along a first direction; the second light source module provides a second light beam along a second direction, wherein the first light source module and the second light source module are offset in a third direction, and any two of the first direction, the second direction and the third direction are perpendicular to each other; and The third light source module provides a third light beam along the second direction, and the third light source module and the second light source module are staggered in the third direction; and The light guiding assembly includes a first beam splitting element, a second beam splitting element and a reflector, wherein: The first beam splitter is configured to allow the second beam to pass through and reflect the third beam, so that both the third beam and the second beam are transmitted along the second direction; The second beam splitter is used to allow the second beam to pass through, and to allow the first beam, the second beam, and the third beam to all be transmitted along the second direction; and The reflector is used to guide the third light beam to the first beam splitting element; The first beam splitter element and the second beam splitter element are fringe beam splitters, and an extending direction of the stripes of the first beam splitter element and an extending direction of the stripes of the second beam splitter element are orthogonal to each other.

2. The lighting system according to claim 1, wherein The first light source module, the second light source module, and the third light source module are staggered with each other in the third direction.

3. The lighting system according to claim 1, wherein Any one of the first light source module, the second light source module, and the third light source module includes a plurality of light emitting components, and each of the plurality of light emitting components includes a plurality of light emitting units.

4. The lighting system according to claim 3, characterized in that The plurality of light-emitting components of any one of the first light source module, the second light source module, and the third light source module are arranged at intervals.

5. The lighting system according to claim 1, wherein An extending direction of the first stripes of the first beam splitter element is parallel to a plane formed by the first direction and the second direction, and an extending direction of the second stripes of the second beam splitter element is parallel to the third direction.

6. The lighting system according to claim 1, wherein An extension plane of the first beam splitter element and an extension plane of the second beam splitter element form an included angle in a direction facing away from the first light source module.

7. The lighting system according to claim 1, wherein The first light splitting element further includes a first transmission area and a second transmission area and a first reflection area and a second reflection area, wherein: a width of the first penetration region in the third direction is greater than a width of the second penetration region in the third direction; and The width of the first reflective region in the third direction is greater than the width of the second reflective region in the third direction.

8. The lighting system according to claim 7, characterized in that The width of the first transmission area is the same as the width of the first reflection area, and the width of the second transmission area is the same as the width of the second reflection area.

9. The lighting system according to claim 7, characterized in that The first transmission area, the second reflection area, the second transmission area, and the first reflection area are arranged in sequence in the third direction.

10. The lighting system according to claim 7, characterized in that The second light splitting element includes a third transmission area and a fourth transmission area and a third reflection area and a fourth reflection area, wherein: The width of the third penetration region in the fourth direction is greater than the width of the fourth penetration region in the fourth direction; and The width of the third reflective region in the fourth direction is greater than the width of the fourth reflective region in the fourth direction, wherein the third direction is orthogonal to the fourth direction.

11. The lighting system according to claim 10, characterized in that The width of the third transmission region is the same as the width of the third reflection region, and the width of the fourth transmission region is the same as the width of the fourth reflection region.

12. The lighting system according to claim 10, characterized in that The third reflective region, the fourth transmissive region, the fourth reflective region, and the third transmissive region are arranged in sequence along the fourth direction.

13. The lighting system according to claim 10, characterized in that The width of the second transmission region and the width of the second reflection region are greater than the width of the fourth transmission region and the width of the fourth reflection region.

14. The lighting system according to claim 10, wherein The first light beam from the first light source module is incident on the third reflection area and / or the fourth reflection area of ​​the second beam splitting element.

15. The lighting system according to claim 10, characterized in that The third light beam from the third light source module enters the reflector and is guided to the first reflective area and / or the second reflective area of ​​the first beam splitter element. The third light beam enters the third transmissive area and / or the fourth transmissive area of ​​the second beam splitter element.

16. The lighting system according to claim 10, characterized in that The second light beam from the second light source module is incident on the first transmission area and / or the second transmission area of ​​the first beam splitter element, and the second light beam is incident on the third transmission area and / or the fourth transmission area of ​​the second beam splitter element.

17. A projection device, characterized in that: The projection device includes 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 and a light guide assembly, wherein: The light source module includes a first light source module, a second light source module and a third light source module, wherein: The first light source module provides a first light beam along a first direction; the second light source module provides a second light beam along a second direction, wherein the first light source module and the second light source module are offset in a third direction, and any two of the first direction, the second direction and the third direction are perpendicular to each other; and The third light source module provides a third light beam along the second direction, and the third light source module and the second light source module are staggered in the third direction; and The light guiding assembly includes a first beam splitting element, a second beam splitting element and a reflector, wherein: The first beam splitter is configured to allow the second beam to pass through and reflect the third beam, so that both the third beam and the second beam are transmitted along the second direction; The second beam splitter is used to allow the second beam to pass through, and to allow the first beam, the second beam, and the third beam to all be transmitted along the second direction; and The reflector is used to guide the third light beam to the first beam splitting element; The first beam splitter element and the second beam splitter element are fringe beam splitters, and the stripe extension direction of the first beam splitter element and the stripe extension direction of the second beam splitter element are orthogonal to each other. wherein the illumination light beam includes at least one of the first light beam, the second light beam, and the third light beam, The light valve is disposed on a 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 disposed on the transmission path of the image light beam, and is used for projecting the image light beam out of the projection device.

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