Light source module and projection device
By using a combination of laser array and reflective beam splitter in the projection device, the high cost and large size problems caused by thick glass optical elements are solved, and the uniformity of the beam in the projection device and the cost reduction are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CORETRONIC CORPORATION
- Filing Date
- 2023-04-24
- Publication Date
- 2026-06-05
AI Technical Summary
Existing projection devices use thick glass optical elements for beam combining, resulting in high costs, large size, and difficulty in achieving uniform color.
The beams are provided by first and second laser arrays respectively, and by using a combination of optical lenses and beam splitters through a series of reflective and beam splitting elements, the beams are homogenized on the incident surface, reducing the dependence on thick glass beam combiners.
It improves color uniformity, reduces device size and cost, and enhances beam uniformity.
Smart Images
Figure CN118838105B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an optical module and an electronic device, and more particularly to a light source module and a projection device. Background Technology
[0002] Projection devices are display devices used to generate large-screen images, and they have been continuously improving with the evolution and innovation of technology. The imaging principle of a projection device is to convert the illumination beam generated by the lighting system into an image beam via a light valve, and then project the image beam through a projection lens onto the target object (such as a screen or wall) to form a projected image. Furthermore, lighting systems have evolved in response to market demands for brightness, color saturation, lifespan, and environmental friendliness in projection devices. They have progressed from ultra-high-performance lamps (UHP lamps) and light-emitting diodes (LEDs) to the most advanced laser diode (LD) light source, and even multi-functional laser diode packages have emerged.
[0003] To improve color uniformity and reduce overall size, the optical path design in a system typically involves combining blue and green light before it enters the optomechanical system. However, current architectures often use thick glass optical elements for light combining, which are quite expensive. Furthermore, to match the red light, the blue and green light needs to be expanded after combining, which increases cost and size.
[0004] The "Background Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Background Art" paragraph may include some known technologies that are not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of this invention were known or recognized by those skilled in the art prior to this application. Summary of the Invention
[0005] The present invention provides a light source module and a projection device that can homogenize multiple light spots formed by a light beam on the light incident surface of an optical lens, thereby improving color uniformity and reducing size and cost.
[0006] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.
[0007] To achieve one, some, or all of the above-mentioned objectives, or other objectives, the present invention provides a light source module, including a first laser array, a second laser array, a first reflective element, a second reflective element, a third reflective element, a fourth reflective element, a fifth reflective element, a sixth reflective element, a first beam splitter, a second beam splitter, and an optical lens. The first laser array provides a first beam and a second beam along a direction parallel to a first direction. The second laser array provides a third beam and a fourth beam along a direction parallel to the first direction. The first beam is sequentially transmitted by the first laser array to the first reflective element, the first beam splitter, and the optical lens. The second beam is sequentially transmitted by the first laser array to the second reflective element, the fifth reflective element, the second beam splitter, and the optical lens. The third beam is sequentially transmitted by the second laser array to the third reflective element, the second beam splitter, and the optical lens. The fourth beam is sequentially transmitted by the second laser array to the fourth reflective element, the sixth reflective element, the first beam splitter, and the optical lens. The first beam splitter reflects the fourth beam from the sixth reflective element and allows the first beam from the first reflective element to pass through to the optical lens. The second beam splitter is used to reflect the second beam from the fifth reflector and to allow the third beam from the third reflector to pass through the optical lens. The orthogonal projections of the first and second beam splitters onto the optical lens at least partially overlap.
[0008] To achieve one, some, or all of the above-mentioned objectives, or other objectives, the present invention further provides a projection device, including an illumination system, at least one light valve, and a projection lens. The illumination system provides an illumination beam. The light source module includes a first laser array, a second laser array, a first reflective element, a second reflective element, a third reflective element, a fourth reflective element, a fifth reflective element, a sixth reflective element, a first beam splitter, a second beam splitter, and an optical lens. The first laser array provides a first beam and a second beam in a direction parallel to a first direction. The second laser array provides a third beam and a fourth beam in a direction parallel to the first direction. The first beam is sequentially transmitted by the first laser array to the first reflective element, the first beam splitter, and the optical lens. The second beam is sequentially transmitted by the first laser array to the second reflective element, the fifth reflective element, the second beam splitter, and the optical lens. The third beam is sequentially transmitted by the second laser array to the third reflective element, the second beam splitter, and the optical lens. The fourth beam is sequentially transmitted by the second laser array to the fourth reflective element, the sixth reflective element, the first beam splitter, and the optical lens. The first beam splitter reflects the fourth beam from the sixth reflective element and allows the first beam from the first reflective element to pass through to the optical lens. The second beam splitter reflects the second beam from the fifth reflector and allows the third beam from the third reflector to pass through the optical lens. The orthogonal projections of the first and second beam splitters onto the optical lens at least partially overlap. At least one light valve is disposed in the path of the illumination beam to convert the illumination beam into an image beam. A projection lens is disposed in the path of the image beam to project the image beam out of the projection device.
[0009] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the light source module and projection device of the present invention, a first laser array provides a first beam and a second beam in a direction parallel to a first direction, a second laser array provides a third beam and a fourth beam in a direction parallel to the first direction, and a first reflective element to a fourth reflective element are located between the first laser array and the second laser array, for reflecting the first beam to the fourth beam to a fifth reflective element, a sixth reflective element, a first beam splitter, and a second beam splitter. In this way, the first beam to the fourth beam can be guided to the optical lens by the first reflective element to the sixth reflective element, the first beam splitter, and the second beam splitter, and the multiple light spots formed by the first beam to the fourth beam on the light incident surface of the optical lens can be homogenized, thereby improving color uniformity, and saving the need for a beam combiner and beam expander made of thick glass, thereby reducing volume and cost.
[0010] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention.
[0012] Figure 2 and Figure 3 This is a schematic diagram of a lighting system according to an embodiment of the present invention from different perspectives.
[0013] Figure 4 for Figure 2 A three-dimensional schematic diagram of the lighting system.
[0014] Figure 5 for Figure 4 A 3D diagram showing the lighting system activating blue light.
[0015] Figure 6 for Figure 4 A 3D diagram showing the lighting system activating its red light.
[0016] Figure 7 for Figure 4 A 3D diagram showing the lighting system activating green light.
[0017] Figures 8A to 8C They are respectively Figure 2 A schematic diagram of the light spots formed by different beams on the incident surface of the optical lens in the light source module.
[0018] Figure 9 This is a schematic diagram of an optical lens and a light-diffusing element in an illumination system according to an embodiment of the present invention. Detailed Implementation
[0019] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms used in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.
[0020] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention. Please refer to... Figure 1 This embodiment provides a projection device 10, including an illumination system 50, at least one light valve 60, and a projection lens 70. The illumination system 50 provides an illumination beam LB. The at least one light valve 60 is disposed in 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 in the transmission path of the image beam LI and is used to project the image beam LI from the projection device 10 onto a projection target (not shown), such as a screen or wall.
[0021] The illumination system 50 is used to provide an illumination beam LB. For example, in this embodiment, the illumination system 50 is composed of a plurality of light-emitting elements, a reflective element 52, a diffuser element 54 / 58, a homogenizing element 56, and / or a plurality of light-guiding elements, for providing light of different wavelengths to facilitate the subsequent formation of an image beam LI. The plurality of light-emitting elements are, for example, laser diodes (LDs); the diffuser element 54 is, for example, a diffuser wheel, and the diffuser element 58 is, for example, a static diffuser. In this embodiment, the diffuser elements 54 and 58 may have different haze levels to make the color more uniform, but the invention is not limited thereto; the homogenizing element 56 is, for example, an integrating column, which may be composed of a mirror, for example, using multiple reflections to improve the uniformity of the laser beam; the light-guiding element is, for example, a dichroic mirror or a reflector. However, the present invention does not limit the type or form of the lighting system 50 in the projection device 10 and its constituent elements. Its detailed structure and implementation can be adequately taught, suggested and explained by the following description and common knowledge in the art.
[0022] The light valve 60 is, for example, a reflective light modulator such as a liquid crystal on silicon panel (LCoS panel) or a digital micromirror 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-optic modulator, a magneto-optic modulator, or an acousto-optic modulator (AOM). This invention does not limit the type or form of the light valve 60. The detailed steps and implementation of the method by which the light valve 60 converts the illumination beam LB into an image beam LI are sufficiently taught, suggested, and described by knowledge of the art and therefore will not be elaborated further. In this embodiment, the number of light valves 60 is one, for example, in a projection device 10 using a single digital micromirror device, but in other embodiments, there may be multiple light valves; this invention is not limited thereto.
[0023] The projection lens 70 may include, for example, a combination of one or more optical lenses with refractive power, such as various combinations of non-planar lenses including 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 planar optical lenses to project the image beam L1 from the light valve 60 onto the projection target in a reflective manner. The present invention does not limit the type or form of the projection lens 70.
[0024] Figure 2 and Figure 3 This is a schematic diagram of a lighting system according to an embodiment of the present invention from different perspectives. Figure 4 for Figure 2 A three-dimensional schematic diagram of the lighting system. Figures 2 to 4 The displayed light source module 100 can be applied to at least Figure 1 The following description uses the projection device 10 as an example. Please refer to [link / reference]. Figures 2 to 4 ,in Figures 2 to 4 The beams provided by the first laser array 111 and the second laser array 112 are omitted for brevity. The illumination system 50 includes a light source module 100, which comprises a first laser array 111, a second laser array 112, a first reflective element 121, a second reflective element 122, a third reflective element 123, a fourth reflective element 124, a fifth reflective element 125, a sixth reflective element 126, a first beam splitter 131, a second beam splitter 132, and an optical lens 140. The second laser array 112 and the first laser array 111 are located on opposite sides of the central axis C of the optical lens 140. Specifically, the first reflective element 121, the second reflective element 122, the third reflective element 123, and the fourth reflective element 124 are located between the first laser array 111 and the second laser array 112, while the fifth reflective element 125, the sixth reflective element 126, the first beam splitter 131, and the second beam splitter 132 are located between the first reflective element 121 to the fourth reflective element 124 and the optical lens 140. In this embodiment, the first laser array 111 and the second laser array 112 are arranged in a direction parallel to the first direction D1, the first reflective element 121 to the fourth reflective element 124 are arranged sequentially in a direction parallel to the second direction D2, and the orthographic projections of the first reflective element 121 and the third reflective element 123 on the second direction D2 overlap, the orthographic projections of the second reflective element 122 and the fourth reflective element 124 on the second direction D2 overlap, and the fifth reflective element 125, the sixth reflective element 126, the first beam splitter 131 and the second beam splitter 132 are arranged in a direction parallel to the second direction D2, wherein the second direction D2 is perpendicular to the first direction D1.
[0025] Figure 5 for Figure 4A 3D diagram showing the lighting system activating blue light. Figure 6 for Figure 4 A 3D diagram illustrating the red light emitted when the lighting system is activated. Please refer to this diagram as well. Figure 5 and Figure 6 Specifically, the first laser array 111 provides a first beam L1 and a second beam L2 along a direction parallel to the first direction D1, while the second laser array 112 provides a third beam L3 and a fourth beam L4 along a direction parallel to the first direction D1. In this embodiment, the first beam L1 is, for example, green or blue light, and the second beam L2 is, for example, red light; however, the first beam L1 may also be, for example, red light, and the second beam L2 may also be, for example, green or blue light, and the invention is not limited thereto. The third beam L3 is, for example, green or blue light, and the fourth beam L4 is, for example, red light; however, the third beam L3 may also be, for example, red light, and the fourth beam L4 may also be, for example, green or blue light, and the invention is not limited thereto. In the first laser array 111, the laser diodes used to provide the first beam L1 and the laser diodes used to provide the second beam L2 are positioned differently in the second direction D2, while in the second laser array 112, the laser diodes used to provide the third beam L3 and the laser diodes used to provide the fourth beam L4 are positioned differently in the second direction D2. In the first laser array 111, the orthogonal projections of the laser diodes providing the first beam L1 and the laser diodes providing the first beam L2 onto the second direction D2 overlap each other. In the second laser array 112, the orthogonal projections of the laser diodes providing the third beam L3 and the laser diodes providing the fourth beam L4 onto the second direction D2 overlap each other. In this embodiment, the wavelengths of the first beam L1 and the third beam L3 are the same, and the wavelengths of the second beam L2 and the fourth beam L4 are the same. In other words, the first laser array 111 and the second laser array 112 are, for example, the same all-in-one laser diode packaged light source. In this embodiment, the first beam splitter 131 and the second beam splitter 132 are used to allow the first beam L1 and the third beam L3 to pass through, and to reflect the second beam L2 and the fourth beam L4, respectively. That is, the first beam splitter 131 and the second beam splitter 132 are, for example, dichroic mirrors with red reflect (DMR).
[0026] In the optical path architecture, the first beam L1 is sequentially transmitted from the first laser array 111 to the first reflective element 121, the first beam splitter 131, and the optical lens 140. In other words, the first laser array 111 provides the first beam L1 to the first reflective element 121, the first reflective element 121 reflects the first beam L1 from the first laser array 111 and transmits it to the first beam splitter 131, and the first beam splitter 131 allows the first beam L1 from the first reflective element 121 to pass through and be transmitted to the optical lens 140. Finally, the first beam L1 forms multiple first light spots P1 on the light-incident surface S of the optical lens 140 (e.g., ...). Figure 8A (As shown).
[0027] The second beam L2 is sequentially transmitted from the first laser array 111 to the second reflective element 122, the fifth reflective element 125, the second beam splitter 132, and the optical lens 140. In other words, the first laser array 111 provides the second beam L2 to the second reflective element 122, the second reflective element 122 reflects the second beam L2 from the first laser array 111 and transmits it to the fifth reflective element 125, the fifth reflective element 125 reflects the second beam L2 from the second reflective element 122 and transmits it to the second beam splitter 132, and the second beam splitter 132 reflects the second beam L2 from the fifth reflective element 125 and transmits it to the optical lens 140. Finally, the second beam L2 forms multiple second light spots P2 on the light-incident surface S of the optical lens 140 (e.g., ...). Figure 8B (As shown).
[0028] The third beam L3 is sequentially transmitted from the second laser array 112 to the third reflective element 123, the second beam splitter 132, and the optical lens 140. In other words, the second laser array 112 provides the third beam L3 to the third reflective element 123, the third reflective element 123 reflects the third beam L3 from the second laser array 112 and transmits it to the second beam splitter 132, and the second beam splitter 132 allows the third beam L3 from the third reflective element 123 to pass through and be transmitted to the optical lens 140. Finally, the third beam L3 forms multiple third light spots P3 on the light-incident surface S of the optical lens 140 (e.g., ...). Figure 8A (As shown).
[0029] The fourth beam L4 is sequentially transmitted from the second laser array 112 to the fourth reflective element 124, the sixth reflective element 126, the first beam splitter 131, and the optical lens 140. In other words, the second laser array 112 provides the fourth beam L4 to the fourth reflective element 124, the fourth reflective element 124 reflects the fourth beam L4 from the second laser array 112 and transmits it to the sixth reflective element 126, the sixth reflective element 126 reflects the fourth beam L4 from the fourth reflective element 124 and transmits it to the first beam splitter 131, and the first beam splitter 131 reflects the fourth beam L4 from the sixth reflective element 126 and transmits it to the optical lens 140. Finally, the fourth beam L4 forms multiple fourth light spots P4 on the light-incident surface S of the optical lens 140 (e.g., ...). Figure 8B (As shown).
[0030] It is worth mentioning that the orthographic projections of the first beam-splitting element 131 and the second beam-splitting element 132 onto the optical lens 140 at least partially overlap. That is, the first beam-splitting element 131 and the second beam-splitting element 132 have an overlap length on a reference plane in the second direction D2. For example, in this embodiment, by configuring the distance from the second beam-splitting element 132 to the optical lens 140 to be less than the distance from the first beam-splitting element 131 to the optical lens 140, the first beam-splitting element 131 and the second beam-splitting element 132 can have an overlap length in the second direction D2. Furthermore, the orthographic projections of the fifth reflecting element 125 and the sixth reflecting element 126 onto the optical lens 140 do not overlap. In this way, the first beam L1 to the fourth beam L4 can be guided to the optical lens 140 by the first reflective element 121 to the sixth reflective element 126, the first beam splitter 131 and the second beam splitter 132, and the multiple light spots formed by the first beam L1 to the fourth beam L4 on the light incident surface S of the optical lens 140 can be homogenized, thereby improving color uniformity. In addition, it can save the configuration of light combining components and beam expanding structures made of thick glass, thereby reducing volume and cost.
[0031] Figure 7 for Figure 4This is a three-dimensional schematic diagram of the lighting system when the green light is activated. In this embodiment, the first laser array 111 can also provide a fifth beam L5 along a direction parallel to the first direction D1, and the second laser array 112 can also provide a sixth beam L6 along a direction parallel to the first direction D1. One of the first reflective element 121 and the second reflective element 122 reflects the fifth beam L5 from the first laser array 111, and one of the third reflective element 123 and the fourth reflective element 124 reflects the sixth beam L6 from the second laser array 112. The wavelength of the fifth beam L5 is the same as the wavelength of the sixth beam L6. For example, in this embodiment, the first beam L1 provided by the first laser array 111 is blue light, the second beam L2 is red light, and the fifth beam L5 is green light. The third beam L3 provided by the second laser array 112 is blue light, the fourth beam L4 is red light, and the sixth beam L6 is green light.
[0032] Therefore, based on the intensity characteristics of red, blue, and green laser light, blue and green laser diodes can be arranged in one column of the first laser array 111 and the second laser array 112, and red laser diodes can be arranged in the other column of the first laser array 111 and the second laser array 112 to balance the light intensity of red, blue, and green light. Thus, the first reflective element 121 is arranged on the transmission paths of the first beam L1 and the fifth beam L5, the second reflective element 122 is arranged on the transmission path of the second beam L2, the third reflective element 123 is arranged on the transmission paths of the third beam L3 and the sixth beam L6, and the fourth reflective element 124 is arranged on the transmission path of the fourth beam L4. In this embodiment, the first laser array 111 and the second laser array 112 each have four red laser diodes, three green laser diodes, and two blue laser diodes, but the invention is not limited thereto. Furthermore, in this embodiment, the light source module 100 also includes two polarization elements 150_1 and 150_2, respectively disposed on the propagation paths of the light beams provided by the first laser array 111 and the second laser array 112. For example, polarization element 150_1 is disposed on the propagation path of red light in the first laser array 111, while polarization element 150_2 is disposed on the propagation path of red light in the second laser array 112, for adjusting the polarization state of the red light provided by the first laser array 111 and the second laser array 112. In another embodiment, polarization element 150_1 can also be disposed on the propagation paths of blue and green light in the first laser array 111, while polarization element 150_2 can be disposed on the propagation paths of blue and green light in the second laser array 112; however, the present invention is not limited thereto.
[0033] Figures 8A to 8C They are respectively Figure 2 This is a schematic diagram showing the light spots formed by different beams of light on the incident surface of the optical lens in the light source module. Please also refer to... Figure 2 and Figures 8A to 8C Among them, the first light beam L1 and the third light beam L3 of blue light form a plurality of first light spots P1 and a plurality of third light spots P3 on the light incident surface S of the optical lens 140. As Figure 8A shown, the plurality of first light spots P1 and the plurality of third light spots P3 are diagonally symmetric with respect to the lens center point B of the optical lens 140. The second light beam L2 and the fourth light beam L4 of red light form a plurality of second light spots P2 and a plurality of fourth light spots P4 on the light incident surface S of the optical lens 140. As Figure 8B shown, the plurality of second light spots P2 and the plurality of fourth light spots P4 are arranged in an array with respect to the lens center point B of the optical lens 140. The fifth light beam L5 and the sixth light beam L6 of green light form a plurality of fifth light spots P5 and a plurality of sixth light spots P6 on the light incident surface S of the optical lens 140. As Figure 8C shown, the plurality of fifth light spots P5 and the plurality of sixth light spots P6 are diagonally symmetric with respect to the lens center point B of the optical lens 140.
[0034] Among them, for the diagonally symmetric light spots, in a preferred embodiment, the light source module 100 meets the condition: 1.0 < (b / a) < 4.0, where b is the distance M in the first direction D1 from the center points F1, F3, F5, F6 of the light spot groups formed by the light beams (the first light beam L1 and the third light beam L3 of blue light, the fifth light beam L5 and the sixth light beam L6 of green light) on the optical lens 140 to the lens center point B of the optical lens 140, and a is the distance N in the direction perpendicular to the first direction D1 from the center points of the light spot groups formed by the light beams on the optical lens 140 to the lens center point B of the optical lens 140. In this way, the light source module 100 can have better luminous efficiency, and the plurality of light spots formed by blue and green light on the optical lens 140 can be symmetric. Figure 8A or Figure 8C ). In this way, the light source module 100 can have better luminous efficiency, and the plurality of light spots formed by blue and green light on the optical lens 140 can be symmetric.
[0035] In addition, in a preferred embodiment, the light source module 100 meets the condition: c - d < e < c + d, where c is the thickness D of the first beam splitting element 131 and the second beam splitting element 132 (as Figure 2 shown) divided by the square root of 2, d is 0.1 times the thickness D of the first beam splitting element 131 and the second beam splitting element 132, and e is the length G in the direction perpendicular to the first direction D1 of the overlapping part of the orthographic projections of the first beam splitting element 131 and the second beam splitting element 132 on the light incident surface S of the optical lens 140 (as Figure 2 shown). In this way, the distances from the light spot center points F1, F2, F3, F4, F5, F6 of the plurality of light spots to the lens center point B of the optical lens 140 can be further reduced, that is, the light spots are concentrated.
[0036] Figure 9This is a schematic diagram of an optical lens and a light-diffusing element in a lighting system according to an embodiment of the present invention. Please also refer to... Figure 2 and Figure 9 Furthermore, the light-diffusing element 56 of the lighting system 50 is positioned along the transmission path of the light beams (i.e., the first beam L1 to the sixth beam L6) from the optical lens 140, and the light-receiving surface of the light-diffusing element 56 is rectangular, having a long side and a short side. In a preferred embodiment, the light source module 100 satisfies the condition: 1.4 ≤ f * tan(θ) / h ≤ 3.7, where f is the length H1 of the light-diffusing element 56 along the optical axis I, θ is the angle θ between the maximum length from the optical lens 140 to the light-diffusing element 56 and the minimum length from the optical lens 140 to the light-diffusing element 56, and h is the length H2 of the long side of the light-diffusing element 56 in the direction perpendicular to the optical axis I. This further improves the luminous efficiency and uniformity of the lighting system 50, and the design of ≤ 3.7 ensures better spatial utilization of the light-diffusing element 56.
[0037] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the light source module and projection device of the present invention, a first laser array provides a first beam and a second beam in a direction parallel to a first direction, a second laser array provides a third beam and a fourth beam in a direction parallel to the first direction, and a first reflective element to a fourth reflective element are located between the first laser array and the second laser array to reflect the first beam to the fourth beam to a fifth reflective element, a sixth reflective element, a first beam splitter, and a second beam splitter. In this way, the first beam to the fourth beam can be guided to the optical lens by the first reflective element to the sixth reflective element, the first beam splitter, and the second beam splitter, and the multiple light spots formed by the first beam to the fourth beam on the light incident surface of the optical lens can be homogenized, thereby improving color uniformity, and saving the need for a beam combiner and beam expander made of thick glass, thus reducing volume and cost.
[0038] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All simple equivalent changes and modifications made in accordance with the claims and description of the invention are still within the scope of this patent. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the invention. In addition, the abstract and title are only used to assist in patent document retrieval and are not intended to limit the scope of the invention. Moreover, the terms "first," "second," etc., mentioned in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.
[0039] [Explanation of Labels in the Attached Image]
[0040] 10: Projection device
[0041] 50: Lighting System
[0042] 52: Reflective element
[0043] 54, 58: Diffusion elements
[0044] 56: Light homogenizing element
[0045] 60: Light valve
[0046] 70: Projection lens
[0047] 100: Light source module
[0048] 111: First laser array
[0049] 112: Second laser array
[0050] 121: First reflecting element
[0051] 122: Second reflective element
[0052] 123: Third reflecting element
[0053] 124: Fourth Reflecting Element
[0054] 125: Fifth reflecting element
[0055] 126: Sixth Reflecting Element
[0056] 131: First beam splitter
[0057] 132: Second beam splitter
[0058] 140: Optical lens
[0059] 150_1, 150_2: Polarization elements
[0060] B: Center point of the lens
[0061] C: Central axis
[0062] D1: First Direction
[0063] D2: Second Direction
[0064] F1~F6: Center point of the light spot
[0065] G: Length
[0066] H1, H2: Length
[0067] I: optical axis
[0068] L1: First beam
[0069] L2: Second beam
[0070] L3: Third Beam
[0071] L4: Fourth Beam
[0072] L5: Fifth Beam
[0073] L6: Sixth Beam
[0074] LB: Illumination beam
[0075] LI: Image Beam
[0076] M, N: Distance
[0077] P1: First light spot
[0078] P2: Second light spot
[0079] P3: Third light spot
[0080] P4: Fourth light spot
[0081] P5: Fifth light spot
[0082] P6: Sixth light spot
[0083] S: Light-receiving surface
[0084] θ: included angle
[0085] D: Thickness.
Claims
1. A light source module, comprising a first laser array, a second laser array, a first reflective element, a second reflective element, a third reflective element, a fourth reflective element, a fifth reflective element, a sixth reflective element, a first beam splitter, a second beam splitter, and an optical lens, wherein: The first laser array provides a first beam and a second beam along a direction parallel to the first direction; The second laser array provides a third beam and a fourth beam in a direction parallel to the first direction; The first beam is sequentially transmitted from the first laser array to the first reflective element, the first beam splitter, and the optical lens; The second beam is sequentially transmitted from the first laser array to the second reflecting element, the fifth reflecting element, the second beam splitter, and the optical lens; The third beam is sequentially transmitted from the second laser array to the third reflecting element, the second beam splitting element, and the optical lens; The fourth beam is sequentially transmitted from the second laser array to the fourth reflecting element, the sixth reflecting element, the first beam splitter, and the optical lens; The first beam-splitting element is used to reflect the fourth beam from the sixth reflective element and to allow the first beam from the first reflective element to pass through the optical lens; and The second beam splitter is used to reflect the second beam from the fifth reflector and to allow the third beam from the third reflector to pass through the optical lens; Wherein, the orthogonal projections of the first beam splitter and the second beam splitter onto the optical lens at least partially overlap.
2. The light source module according to claim 1, wherein the first laser array and the second laser array are arranged in a direction parallel to the first direction, the first reflective element to the fourth reflective element are arranged in a direction parallel to the second direction, the fifth reflective element, the sixth reflective element, the first beam splitting element and the second beam splitting element are arranged in a direction parallel to the second direction, and the second direction is perpendicular to the first direction.
3. The light source module according to claim 1, wherein the first reflective element to the fourth reflective element are located between the first laser array and the second laser array.
4. The light source module according to claim 1, wherein the fifth reflective element, the sixth reflective element, the first beam splitter and the second beam splitter are located between the first reflective element to the fourth reflective element and the optical lens.
5. The light source module according to claim 1, wherein the second laser array and the first laser array are located on opposite sides of the central axis of the optical lens.
6. The light source module according to claim 1, wherein the wavelength of the first beam is the same as the wavelength of the third beam, and the wavelength of the second beam is the same as the wavelength of the fourth beam.
7. The light source module according to claim 1, wherein a plurality of first light spots formed by the first light beam on the light incident surface of the optical lens and a plurality of third light spots formed by the third light beam on the light incident surface of the optical lens are diagonally symmetric or arranged in an array with respect to the lens center point of the optical lens, and a plurality of second light spots formed by the second light beam on the light incident surface of the optical lens and a plurality of fourth light spots formed by the fourth light beam on the light incident surface of the optical lens are diagonally symmetric or arranged in an array with respect to the lens center point of the optical lens, and the lens center point is located on the central axis of the optical lens.
8. The light source module according to claim 1, wherein the first laser array further provides a fifth light beam in a direction parallel to the first direction, the second laser array further provides a sixth light beam in a direction parallel to the first direction, one of the first reflecting element and the second reflecting element reflects the fifth light beam from the first laser array, and one of the third reflecting element and the fourth reflecting element is used to reflect the sixth light beam from the second laser array, and the wavelength of the fifth light beam is the same as the wavelength of the sixth light beam.
9. The light source module according to claim 1, wherein the light source module satisfies the conditional formula: 1.0 < (b / a) < 4.0, where b is the distance from the light spot center point of a plurality of light spots formed by the light beam on the optical lens to the lens center point of the optical lens in a direction perpendicular to the first direction, and a is the distance from the light spot center point of the plurality of light spots formed by the light beam on the optical lens to the lens center point of the optical lens in the first direction.
10. The light source module according to claim 1, wherein the light source module satisfies the conditional formula: c - d < e < c + d, where c is the thickness of the first beam splitting element and the second beam splitting element divided by the square root of 2, d is 0.1 times the thickness of the first beam splitting element and the second beam splitting element, and e is the length of the overlapping portion of the orthographic projections of the first beam splitting element and the second beam splitting element on the light incident surface of the optical lens in a direction perpendicular to the first direction.
11. A projection device, comprising an illumination system, at least one light valve, and a projection lens, wherein: The illumination system is used to provide an illumination light beam, the illumination system includes a light source module, and the light source module includes a first laser array, a second laser array, a first reflecting element, a second reflecting element, a third reflecting element, a fourth reflecting element, a fifth reflecting element, a sixth reflecting element, a first beam splitting element, a second beam splitting element, and an optical lens, wherein: The first laser array provides a first light beam and a second light beam in a direction parallel to the first direction; The second laser array provides a third light beam and a fourth light beam in a direction parallel to the first direction; The first light beam is sequentially transmitted from the first laser array to the first reflecting element, the first beam splitting element, and the optical lens; The second beam is sequentially transmitted from the first laser array to the second reflecting element, the fifth reflecting element, the second beam splitter, and the optical lens; The third beam is sequentially transmitted from the second laser array to the third reflecting element, the second beam splitting element, and the optical lens; The fourth beam is sequentially transmitted from the second laser array to the fourth reflecting element, the sixth reflecting element, the first beam splitter, and the optical lens; The first beam-splitting element is used to reflect the fourth beam from the sixth reflective element and to allow the first beam from the first reflective element to pass through the optical lens; and The second beam splitter is used to reflect the second beam from the fifth reflector and to allow the third beam from the third reflector to pass through the optical lens, wherein the first beam splitter and the orthogonal projection portion of the second beam splitter on the optical lens overlap; The at least one light valve is disposed on the transmission path of the illumination beam for converting the illumination beam into an image beam; and The projection lens is positioned on the transmission path of the image beam and is used to project the image beam out of the projection device.
12. The projection device according to claim 11, wherein the first laser array and the second laser array are arranged in a direction parallel to the first direction, the first to the fourth reflective elements are arranged in a direction parallel to the second direction, and the fifth, the sixth, the first, and the second reflective elements are arranged in a direction parallel to the second direction, wherein the second direction is perpendicular to the first direction.
13. The projection device according to claim 11, wherein the first reflective element to the fourth reflective element are located between the first laser array and the second laser array.
14. The projection device according to claim 11, wherein the fifth reflective element, the sixth reflective element, the first beam splitter and the second beam splitter are located between the first reflective element to the fourth reflective element and the optical lens.
15. The projection device according to claim 11, wherein the second laser array and the first laser array are located on opposite sides of the central axis of the optical lens.
16. The projection apparatus according to claim 11, wherein the wavelength of the first beam is the same as the wavelength of the third beam, and the wavelength of the second beam is the same as the wavelength of the fourth beam.
17. The projection device according to claim 11, wherein a plurality of first light spots formed by the first light beam on the light incident surface of the optical lens and a plurality of third light spots formed by the third light beam on the light incident surface of the optical lens are diagonally symmetric or arranged in an array with respect to the lens center point of the optical lens, a plurality of second light spots formed by the second light beam on the light incident surface of the optical lens and a plurality of fourth light spots formed by the fourth light beam on the light incident surface of the optical lens are diagonally symmetric or arranged in an array with respect to the lens center point of the optical lens, and the lens center point is located on the central axis of the optical lens.
18. The projection device according to claim 11, wherein the first laser array further provides a fifth light beam along a direction parallel to the first direction, the second laser array further provides a sixth light beam along a direction parallel to the first direction, one of the first reflection element and the second reflection element reflects the fifth light beam from the first laser array, one of the third reflection element and the fourth reflection element is configured to reflect the sixth light beam from the second laser array, and the wavelength of the fifth light beam is the same as the wavelength of the sixth light beam.
19. The projection device according to claim 11, wherein the light source module satisfies the conditional formula: 1.0 < (b / a) < 4.0, where b is the distance from the light spot center point of a plurality of light spots formed by the light beam on the optical lens to the lens center point of the optical lens in a direction perpendicular to the first direction, and a is the distance from the light spot center point of the plurality of light spots formed by the light beam on the optical lens to the lens center point of the optical lens in the first direction.
20. The projection device according to claim 11, wherein the light source module satisfies the conditional formula: c - d < e < c + d, where c is the thickness of the first beam splitting element and the second beam splitting element divided by the square root of 2, d is 0.1 times the thickness of the first beam splitting element and the second beam splitting element, and e is the length of the overlapping portion of the orthographic projections of the first beam splitting element and the second beam splitting element on the light incident surface of the optical lens in a direction perpendicular to the first direction.
21. The projection device according to claim 11, wherein the illumination system further includes a light homogenizing element disposed on the transmission path of the first light beam to the fourth light beam from the optical lens, and the light source module satisfies the conditional formula: 1.4 ≤ f * tan(θ) / h ≤ 3.7, where f is the length of the light homogenizing element in the optical axis direction, θ is the included angle between the maximum length from the optical lens to the light homogenizing element and the minimum length from the optical lens to the light homogenizing element, and h is the length of the long side of the light homogenizing element in a direction perpendicular to the optical axis.