Light source device and projection system
By modifying the optical path of the dichroic wheel reflecting excitation light, the excitated light only needs to pass through a splitter and use a mirror to combine light, solving the problems of beam divergence and system volume increase in the prior art, improving the efficiency of the light source and reducing the volume.
Patent Information
- Application Number
- CN202422030348.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-08-21
AI Technical Summary
In the existing laser light source system, the excited light needs to pass through two spectrometers, resulting in the light beam divergence, reduced efficiency and increased system volume.
By modifying the optical path of the excitation light reflected by the dichroic color wheel, the excitation light only needs to pass through a splitter, and the optical path of the excitation light is changed by using the mirror group to ensure that the excitation light and the excited light are combined on the splitter.
The distance between the excited light and the optical machine system is shortened, the efficiency of the light source is improved, and the volume of the light source device is reduced.
Smart Images
Figure CN222690046U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of projection display, in particular to a light source device and a projection system. Background Art
[0002] Existing laser light source systems such as Figure 3 As shown, it is composed of a laser light source 10, a converging lens a 11, a color separation wheel 12, a collimating lens 13, a light homogenizing element 14, a first beam splitter 15, a converging lens b 16, a wavelength conversion device 17, a reflector 18, and a second beam splitter 21. The converging lens a 11 converges the excitation light 101 onto the color separation wheel 12. A part of the excitation light 101 is reflected by the color separation wheel 12 and then reflects downward through the reflector 18 and the second beam splitter 21; another part of the excitation light 101 is transmitted through the color separation wheel 12, and then passes through the collimating lens 13, the light homogenizing element 14, the first beam splitter 15, and the converging lens b 16 in sequence, and then forms an excitation light spot on the wavelength conversion device 17, generating stimulated light 102, which is transmitted through the converging lens b 16, the first beam splitter 15, and the second beam splitter 21; finally, the excitation light 101 and the stimulated light 102 are combined and incident downward into the optical machine system.
[0003] Two beam splitters are used in the system. The stimulated light 102 needs to pass through the first beam splitter 15 and the second beam splitter 21 to enter the optomechanical system from the wavelength conversion device 17. The converging lens b16 is far away from the optomechanical system, causing the light beam to diverge and reducing the efficiency of entering the optomechanical system. At the same time, because the stimulated light 102 passes through two beam splitters before reaching the optomechanical system, the volume of the system becomes larger. Utility Model Content
[0004] In view of the defects of the prior art mentioned above, the technical problem to be solved by the present invention is to provide a light source device and a projection system which can improve efficiency and have a small system volume.
[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a light source device, including a laser light source, a color separation wheel, a spectrometer and a wavelength conversion device, and also including a reflector group. After the excitation light emitted by the laser light source passes through the color separation wheel, a part of the excitation light is reflected by the color separation wheel to the reflector group to form a first light transfer route, and the other part of the excitation light is transmitted through the color separation wheel, and then passes through the wavelength conversion device to generate stimulated light to form a second light transfer route; the plane formed by the first light transfer route and the plane formed by the second light transfer route are located in different planes and are perpendicular to each other, and the stimulated light and the reflected excitation light are finally combined on the spectrometer and incident on the optical machine system.
[0006] As a preferred embodiment of the above scheme, a converging lens a is arranged between the laser light source and the color separation wheel, a collimating lens and a light homogenizing element are arranged in sequence between the color separation wheel and the beam splitter, the wavelength conversion device is located on one side of the beam splitter, and a converging lens b is arranged between the beam splitter and the wavelength conversion device, and the transmitted light guided by the color separation wheel passes through the collimating lens to reach the beam splitter and is perpendicular to the optical axis of the stimulated light.
[0007] Preferably, the reflector group includes a reflector a, a reflector b and a reflector c.
[0008] Preferably, the optical axis formed by the reflector a and the reflector b is parallel to the optical axis formed by the laser light source, the color separation wheel and the beam splitter.
[0009] Preferably, the beam splitter is disposed between the color separation wheel and the reflector c, and the color separation wheel, the reflector a, the reflector b, and the reflector c are arranged in a parallelogram.
[0010] Preferably, the reflector a, reflector b, reflector c, beam splitter, and color separation color wheel are all arranged at 45°.
[0011] Preferably, the wavelength conversion device is a cylindrical structure.
[0012] Preferably, the color separation color wheel guides a small portion of the excitation light to the first light transfer route, and most of the excitation light to the second light transfer route.
[0013] Preferably, the duty cycle of the small portion of excitation light guided by the color separation wheel to the first light transfer route is 11.1% to 25%, that is, the duty angle of the blue light is 40° to 90°.
[0014] The utility model also provides a projection system, comprising the above light source device.
[0015] The beneficial effects of the utility model are as follows: by modifying the optical path of the excitation light reflected by the color separation wheel, the stimulated light is changed from passing through two beam splitters to passing through only one beam splitter, so that the distance from the stimulated light to the optical machine system is shortened, the efficiency of the light source is improved, and the volume of the light source is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a front view of the utility model;
[0017] Figure 2 This is a state diagram of the utility model with viewing angle;
[0018] Figure 3 It is a front view of the existing light source device.
[0019] Figure numerals: 10 laser light source, 101 excitation light, 102 stimulated light, 11 converging lens a, 12 color separation color wheel, 13 collimating lens, 14 light homogenizing element, 15 beam splitter, 16 converging lens b, 17 wavelength conversion device, 18 reflector a, 19 reflector b, 20 reflector c. DETAILED DESCRIPTION
[0020] In order to better understand the improvements made by the present invention relative to the prior art, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0021] like Figure 1 —2 shows a light source device, which is mainly composed of a laser light source 10, a color separation wheel 12, a beam splitter 15, a wavelength conversion device 17 and a reflector group, wherein the reflector group is used to modify the optical path setting of the excitation light reflected by the color separation wheel so that the device only needs one beam splitter.
[0022] After the excitation light 101 emitted by the laser light source 10 passes through the dichroic wheel 12, the dichroic wheel 12 is used to reflect and transmit the excitation light 101 emitted by the laser light source 10. A part of the excitation light 101 is reflected by the dichroic wheel 12 to the reflector group to form a first light transfer route, and another part of the excitation light 101 is transmitted through the dichroic wheel 12, and then passes through the wavelength conversion device 17 to generate stimulated light 102 to form a second light transfer route. The first light transfer route and the second light transfer route are located in different planes, and the plane formed by the first light transfer route and the plane formed by the second light transfer route are perpendicular to each other. The excitation light guided by the dichroic wheel is incident from a direction perpendicular to the rotation plane of the wavelength conversion device, that is, the laser light source 10 is incident from a direction perpendicular to the rotation plane of the wavelength conversion device. Finally, the reflected excitation light 101 and the stimulated light 102 are finally combined on the beam splitter 15 and incident on the optical machine system.
[0023] A converging lens a 11 is arranged between the laser light source 10 and the color separation wheel 12, and a collimating lens 13 and a light homogenizing element 14 are arranged in sequence between the color separation wheel 12 and the beam splitter 15. A wavelength conversion device 17 is located on one side of the beam splitter 15, and a converging lens b 16 is arranged between the beam splitter 15 and the wavelength conversion device 17. The transmitted light guided by the color separation wheel 12 passes through the collimating lens 13 to reach the beam splitter 15, and is perpendicular to the optical axis of the converted light 102. Among them, the wavelength conversion device 17 is a cylindrical structure.
[0024] The reflector group is preferably composed of reflector a 18, reflector b 19 and reflector c 20, wherein the optical axis formed by reflectors a 18 and b 19 is parallel to the optical axis formed by the laser light source 10, the color separation wheel 12 and the beam splitter 15. Preferably, the beam splitter 15 is arranged between the color separation wheel 12 and the reflector c 20, and the color separation wheel 12, reflector a 18, reflector b 19 and reflector c 20 are arranged in a parallelogram; in order to better change the optical path, so that the excitation light 101 and the stimulated light 102 can finally be combined on the beam splitter 15 and then incident on the optical machine system, in the optical path, the reflector a 18, reflector b 19, reflector c20, beam splitter 15 and the color separation wheel 12 are all arranged at 45°.
[0025] Specifically, during the operation of the light source device, the excitation light 101 emitted by the excitation light source 10 is incident on the light incident side of the color separation wheel 12. In order to improve the utilization rate of the light source, a converging lens a11 is arranged between the laser light source 10 and the color separation wheel 12. The converging lens a11 has the function of converging light. Because of its structure that is thicker in the center and thinner at the edges, the excitation light 101 can be concentrated to one point.
[0026] Preferably, the color separation wheel 12 guides a small portion of the excitation light 101 to the first light transfer route, and most of the excitation light 101 to the second light transfer route; when specifically set, the duty ratio of the small portion of the excitation light 101 guided by the color separation wheel 12 to the first light transfer route can be 11.1% to 25%, that is, the blue light duty angle is 40° to 90°, but not limited to this. Most of the excitation light 101 emitted by the excitation light source 10 is transmitted by the color separation wheel 12, that is, guided to the second light transfer route, and this part of the excitation light 101 is further transmitted through the collimating lens 13 and the homogenizing element 14. The collimating lens 13 can ensure that the light of the excitation light 101 at each point becomes a beam of parallel collimated light, which can ensure that the light will not spread to unnecessary directions. The collimated excitation light 101 passes through the homogenizing element 14, and the homogenizing element 14 can shape the light of the excitation light 101 to achieve a more uniform light intensity distribution and thus improve the utilization rate of light energy. The excitation light 101 is sequentially transmitted, reflected by the beam splitter 15, and transmitted through the converging lens b 16 to the wavelength conversion device 17, and forms an excitation light spot, generating stimulated light 102. The stimulated light 102 is then transmitted through the converging lens b 16 and the beam splitter 15, and finally the stimulated light 102 incident on the beam splitter 15 passes through the beam splitter 15 through the transmission effect and is incident on the optical machine system.
[0027] Another small part of the excitation light 101 emitted by the excitation light source 10 is reflected by the color separation wheel 12, that is, guided to the first light transfer route, and the reflected part of the excitation light 101 is reflected to a reflector group consisting of a reflector a 18, a reflector b 19, and a reflector c 20. The reflector group includes at least one reflector, which may be two, four or more, but is not limited thereto, as long as it can ensure that the plane where the first light transfer route is formed is perpendicular to the plane where the second light transfer route is formed, and the reflected excitation light and the stimulated light can be combined at the beam splitter. As shown by the arrows in the figure, the excitation light 101 of the reflective part is incident on the reflector a18, and after being reflected to the right by the reflector a18 in turn, it is incident on the reflector b19, changing from the original downward direction to perpendicular to the screen inward, and then to the right; after being reflected again by the reflector b19, this part of the excitation light 101 is incident on the reflector c20 located on the right side of the beam splitter 15, and is reflected by the reflector c20 onto the beam splitter 15, that is, it is then perpendicular to the screen outward, then to the left, and finally reflected downward by the beam splitter 15, combined with the stimulated light 102, and incident on the optical machine system. Since the reflector a 18, the reflector b 19, the reflector c 20, the beam splitter 15 and the color separation wheel 12 are all arranged at 45 degrees, the light path formed by the color separation wheel 12, the reflector a 18, the reflector b 19 and the reflector c 20 is rectangular, and the optical axis formed by the reflector a 18 and the reflector b 19 is parallel to the optical axis formed by the laser light source 10, the color separation wheel 12 and the beam splitter 15.
[0028] The light source device provided by the utility model, through the reflection effect of the reflector group on the excitation light, makes it possible for the excitation light of the light source device to achieve the combination of the excitation light and the stimulated light without setting an additional beam splitter for reflection, with a small number of components and a simple optical path structure, and is conducive to reducing the volume of the laser light source device, so that the distance from the stimulated light to the optical machine system is shortened, and the efficiency of the light source is improved. The modified light source device shortens the distance from the converging lens b to the optical machine system, saves the distance of a dichroic mirror, and because the wavelength conversion device rotates vertically to the screen, the height of part of the excitation light passing through the reflector group can be controlled within the radius of the cylinder, so that the thickness in the refraction direction will not increase due to the modification of the refraction direction.
[0029] The utility model also provides a projection system, comprising the above light source device.
[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A light source device, comprising a laser light source (10), a color separation wheel (12), a beam splitter (15) and a wavelength conversion device (17), characterized in that: It also includes a reflector group, wherein after the excitation light (101) emitted by the laser light source (10) passes through the color separation wheel (12), a portion of the excitation light (101) is reflected by the color separation wheel (12) to the reflector group to form a first light transfer route, and another portion of the excitation light (101) is transmitted through the color separation wheel (12) and then passes through a wavelength conversion device (17) to generate stimulated light (102) to form a second light transfer route; the plane formed by the first light transfer route and the plane formed by the second light transfer route are located in different planes and are perpendicular to each other, and the stimulated light (102) and the reflected excitation light (101) are finally combined on the beam splitter (15) and incident on the optical machine system.
2. A light source device according to claim 1, characterized in that: A converging lens a (11) is arranged between the laser light source (10) and the color separation wheel (12); a collimating lens (13) and a light homogenizing element (14) are arranged in sequence between the color separation wheel (12) and the beam splitter (15); a wavelength conversion device (17) is located on one side of the beam splitter (15); and a converging lens b (16) is arranged between the beam splitter (15) and the wavelength conversion device (17); the transmitted light guided by the color separation wheel (12) passes through the collimating lens (13) and reaches the beam splitter (15), and is perpendicular to the optical axis of the stimulated light (102).
3. A light source device according to claim 1 or 2, characterized in that: The reflector group comprises a reflector a (18), a reflector b (19) and a reflector c (20).
4. A light source device according to claim 3, characterized in that: The optical axis formed by the reflector a (18) and the reflector b (19) is parallel to the optical axis formed by the laser light source (10), the color separation wheel (12) and the beam splitter (15).
5. A light source device according to claim 4, characterized in that: The beam splitter (15) is arranged between the color separation wheel (12) and the reflector c (20), and the color separation wheel (12), the reflector a (18), the reflector b (19), and the reflector c (20) are arranged in a parallelogram.
6. A light source device according to claim 5, characterized in that: The reflector a (18), the reflector b (19), the reflector c (20), the beam splitter (15), and the color separation wheel (12) are all arranged at 45 degrees.
7. A light source device according to claim 1, characterized in that: The wavelength conversion device (17) is a cylindrical structure.
8. The light source device according to claim 1, characterized in that: The color separation wheel (12) guides a small portion of the excitation light (101) to a first light transfer route, and a large portion of the excitation light (101) to a second light transfer route.
9. A light source device according to claim 8, characterized in that: The duty cycle of the small portion of the excitation light (101) guided to the first light transfer route by the color separation wheel (12) is 11.1% to 25%, that is, the duty angle of the blue light is 40° to 90°.
10. A projection system, characterized in that: A light source device comprising any one of claims 1-9.