Lighting device
By employing a bidirectional excitation light source system design in LED lighting devices, the phosphor is excited from different directions using a first light source system and an excitation light module, thus solving the problem of insufficient phosphor utilization, improving light power density and illumination brightness, and enhancing the brightness and color gamut of white light.
Patent Information
- Application Number
- CN202520444732.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-03-13
AI Technical Summary
The phosphors in existing LED lighting devices are not fully utilized, resulting in insufficient light power density and lighting brightness, and the green light illuminance is not high enough, making it difficult to improve the light density.
The light source system is designed with bidirectional excitation. The phosphor is excited from different directions by the first light source system and the excitation light module, which improves the excitation efficiency of the phosphor. Combined with the light combining system and the light homogenizing system, the brightness is improved after the light is combined.
It improves light brightness, enhances the brightness and color gamut of the combined white light, and strengthens the lighting effect.
Smart Images
Figure CN223795130U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of light source technology, specifically to a lighting device. Background Technology
[0002] With the development of semiconductor technology, LED (Light Emitting Diode) light sources are gradually replacing traditional incandescent lamps and energy-saving lamps, becoming a universal lighting source due to their many advantages such as high luminous flux, long lifespan, small structure, safety, high efficiency, and energy saving.
[0003] Current white light sources primarily use blue LED chips to excite phosphors. However, the phosphor chips in LED modules used for lighting are generally single-sided transmissive excitation, resulting in underutilization of the phosphor. Furthermore, to retain some blue light from the LED chip to mix with the yellow light generated by excitation radiation to form white light, the light power density and illumination brightness are reduced. Due to the limitations of single-sided excitation, the illuminance of green light is insufficient, making it difficult to improve light density. Utility Model Content
[0004] This application provides a lighting device to at least partially improve the above-mentioned technical problems.
[0005] In a first aspect, embodiments of this application provide a lighting device, including a first light source system, an excitation light module, a second light source system, a light combining system, a light focusing system, an aperture, and a lens. The first light source system includes a first light source and a first wavelength conversion device. The first wavelength conversion device includes a first surface and a second surface facing away from each other. The first light source is used to emit a first excitation light. The first excitation light enters the wavelength conversion device from the first surface and is at least partially converted into first light rays, which pass through the first wavelength conversion device. The excitation light module is used to emit a second light ray. The second light ray is guided to enter the wavelength conversion device from the second surface and is at least partially converted into first light rays. The second light source system is used to emit the second light ray. The light combining system is used to guide the first light ray and the second light ray to combine before emission. The light focusing system is used to converge the combined light ray. An aperture is disposed in the optical path of the combined light ray, and a lens is used to project light outward.
[0006] In some embodiments, the light combining system includes a first beam splitter that can transmit a first light ray and reflect a second light ray. The second light ray emitted from the excitation light module is reflected by the first beam splitter to a second surface and is at least partially converted into the first light ray. The second light ray emitted from the second light source system is reflected and combined with the first light ray transmitted through the first beam splitter before being emitted.
[0007] In some implementations, the second light source system is also used to emit a third light beam.
[0008] In some embodiments, the lighting device further includes a third light source system for emitting a third light ray, and a light combining system for guiding the first light ray, the second light ray, and the third light ray to combine before emission.
[0009] In some embodiments, the light combining system further includes a second beam splitter, which can reflect a third ray and transmit other rays. The third ray emitted from the third light source system is incident on the second beam splitter and reflected. The first ray and the second ray emitted from the second light source system are combined and then transmitted through the second beam splitter to combine with the third ray to form illumination light.
[0010] In some embodiments, the first light source system further includes a collimation system located in the optical path of the first ray and used to collimate the first ray.
[0011] In some implementations, the excitation light module is a blue LED module or a blue laser module.
[0012] In some embodiments, the first light source includes a plurality of LED beads arranged in an array, or the first light source includes a plurality of light-emitting chips integrated into one unit.
[0013] In some embodiments, the lighting device further includes a light homogenizing system for homogenizing the combined light, and the light homogenizing system is disposed between the light combining system and the light focusing system or between the light focusing system and the aperture.
[0014] In some embodiments, the illumination device further includes a filter disposed between the aperture stop and the light equalization system, or between the aperture stop and the lens.
[0015] The lighting device provided in this application embodiment is a first wavelength conversion device in a first light source system that is excited by the first light source from the direction of the first surface, while the second light emitted from the excited light module is excited from the direction of the second surface, thereby achieving bidirectional excitation and improving the excitation efficiency to increase the brightness of the first light. This results in a higher brightness of the white light that is subsequently combined with other light sources. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of a lighting device proposed in an embodiment of this application.
[0018] Figure 2This is a schematic diagram of another lighting device proposed in an embodiment of this application.
[0019] Figure 3 This is a schematic diagram of the structure of a first light source in a lighting device according to an embodiment of this application.
[0020] Figure 4 This is a schematic diagram of the structure of another first light source in a lighting device proposed in an embodiment of this application.
[0021] Figure 5 This is a schematic diagram of another lighting device proposed in an embodiment of this application.
[0022] Figure 6 This is a coating curve of a filter in a lighting device according to an embodiment of this application.
[0023] Figure 7 This is a schematic diagram of another lighting device proposed in an embodiment of this application.
[0024] Figure 8 This is a schematic diagram of another lighting device proposed in an embodiment of this application. Detailed Implementation
[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.
[0026] In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components; they can refer to mere surface contact; or they can refer to surface contact connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0027] Furthermore, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as referring to specific or particular structures. The terms "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this application, as well as the features of different embodiments or examples.
[0028] Example 1
[0029] See Figure 1 This embodiment provides an illumination device 10, including a first light source system 30, a second light source system 40, a third light source system 50, an excitation light module 60, a light combining system, a light focusing system 11, an aperture 13, and a lens 14. The first light source system 30 emits a first light beam, the second light source system 40 emits a second light beam, and the third light source system 50 emits a third light beam. The lens 14 projects the illumination light outwards.
[0030] In this embodiment, the first light ray is green, the second light ray is blue, and the third light ray is red. It is understood that in other embodiments, the first, second, and third light rays may be configured in other ways, and this embodiment does not limit this.
[0031] For details, please continue reading Figure 1 The first light source system 30 includes a first light source 31 and a first wavelength conversion device 33. The first light source 31 is disposed on a first heat sink 32, which is used to dissipate heat generated by the first light source 31 during operation. The first light source 31 may be, for example, a blue light source, and the first wavelength conversion device 33 may be a phosphor sheet carrying green phosphor. The first wavelength conversion device 33 includes a first surface and a second surface facing away from each other. The first light source 31 emits first excitation light, which enters the first wavelength conversion device 33 from the first surface and is at least partially converted into first light rays, which then pass through the first wavelength conversion device 33. The first light source 31 can excite the phosphor on the first surface of the first wavelength conversion device 33 to form the first light rays.
[0032] The first light source system 30 may further include a collimation system 34, which is located in the optical path of the first light ray and is used to collimate the first light ray, making the first light ray emitted more collimated. In this embodiment, the light combining system includes a first beam splitter 70, which is disposed in the outgoing optical path of the first light ray and can transmit the first light ray. At the same time, the first beam splitter 70 can also reflect the second light ray. The first beam splitter 70 can be tilted relative to the optical axis direction of the first light ray, for example, tilted at 45°.
[0033] The excitation light module 60 emits a second light beam. This second light beam is incident on the first beam splitter 70, reflected by the first beam splitter 70, and after reflection, passes through the collimation system 34 and propagates towards the second surface of the first wavelength conversion device 33. It then enters the first wavelength conversion device 33 from the second surface and is at least partially converted into a first light beam. This portion of the excited first light beam is emitted towards the first light source 31, and after passing through the chip surface of the first light source 31, it is reflected towards the first beam splitter 70. The first light beam emitted from the first light source system 30 is incident on and passes through the first beam splitter 70. The second light beam emitted from the excitation light module 60 can excite the phosphor on the second surface of the first wavelength conversion device 33 to form the first light beam. Thus, both the first and second surfaces of the first wavelength conversion device 33 are excited, significantly improving the excitation efficiency of the phosphor on the first wavelength device. This increases the brightness of the first light beam emitted from the first light source system 30, thereby increasing the brightness of the combined white light.
[0034] Specifically, in this embodiment, the excitation light module 60 is a blue LED module, and the excitation light module 60 emits blue light as a second light source. In other embodiments, see [reference needed]. Figure 2 The excitation light module 60 can also be a blue laser module.
[0035] The second light source system 40 is used to emit a second light beam, which is then combined with the first and third light beams. In this embodiment, the second light source system 40 includes a second light source 41, which is disposed on a second heat sink 42. The second heat sink 42 is used to dissipate the heat generated by the second light source 41 during operation. The second light source 41 may be, for example, a blue light source.
[0036] In this embodiment, the second light source system 40 and the excitation light module 60 are located on opposite sides of the first beam splitter 70. The optical axis of the second light emitted from the second light source system 40 is parallel to the optical axis of the second light emitted from the excitation light module 60, and the optical axis of the second light emitted from the second light source system 40 is approximately perpendicular to the optical axis of the first light emitted from the first light source system 30. The second light emitted from the second light source system 40 is incident on the first beam splitter 70 and reflected by the first beam splitter 70. The optical axis of the reflected second light is in the same direction as the optical axis of the first light, thereby causing the second light and the first light to combine.
[0037] The second light source system 40 may also include a collimation system 34, which is located in the optical path of the second light ray and is used to collimate the second light ray so that the second light ray is emitted more collimatedly onto the first beam splitter 70.
[0038] The third light source system 50 emits a third light beam, which is then combined with the first and second light beams. In this embodiment, the third light source system 50 includes a third light source 51 and a third wavelength conversion device 53. The third light source 51 is disposed on a third heat sink 52, which dissipates the heat generated by the third light source 51 during operation. The third light source 51 may be, for example, a blue light source, and the third wavelength conversion device 53 may be a phosphor sheet loaded with red phosphor. The third light source 51 emits a third excitation light, which is incident on the third wavelength conversion device 53 and at least partially converted into a third light beam. The third light beam passes through the third wavelength conversion device 53 and is then combined with the first and second light beams. In other embodiments, the third light source system may also be a light-emitting chip that directly emits red light.
[0039] In this embodiment, the light combining system further includes a second beam splitter 80. The second beam splitter 80 can reflect a third ray and transmit other rays. The third ray emitted from the third light source system 50 is incident on the second beam splitter 80 and reflected. The first ray and the second ray emitted from the second light source system 40 are combined and then pass through the second beam splitter 80 to combine with the third ray to form illumination light. In this embodiment, the second beam splitter 80 can be arranged approximately parallel to the first beam splitter 70, and the second beam splitter 80 is located in the optical path of the first ray. The first ray passes through the first beam splitter 70 and then combines with the third ray. The combined ray passes through the second beam splitter 80 and combines with the third ray reflected by the second beam splitter 80.
[0040] The optical axis of the third ray emitted from the third light source system 50 is approximately parallel to the optical axis of the second ray emitted from the second light source system 40, and the optical axis of the third ray emitted from the third light source system 50 is approximately perpendicular to the optical axis of the first ray emitted from the first light source system 30. The third ray emitted from the third light source system 50 is incident on the second beam splitter 80 and reflected by the second beam splitter 80. The optical axis of the reflected third ray is in the same direction as the optical axis of the first ray, thus causing the third ray, the first ray, and the second ray to combine.
[0041] The third light source system 50 may also include a collimation system 34, which is located in the optical path of the second light ray and is used to collimate the third light ray, so that the third light ray is emitted more collimatedly onto the second beam splitter 80.
[0042] In this embodiment, the first light is green light, which is simultaneously excited from both the first surface and the second surface by the first light source 31 and the excitation light source group, thereby increasing the brightness of the green light and improving the brightness of the illumination light formed after the light is combined.
[0043] In this embodiment, the first light source 31, the second light source 41, and the third light source 51 can each include multiple LED beads 311, and the multiple LED beads 311 can be arranged according to design requirements. For example, in one embodiment, see [reference needed]. Figure 3 , Figure 3 The structure of the first light source 31 is shown. The first light source 31 includes a plurality of LED beads 311 arranged in a rectangular array. In other embodiments, the plurality of LED beads 311 can be arranged in various arrays such as a circular array, which is not limited in this embodiment. In addition, the light-emitting surface of each LED bead can also be rectangular, circular, or other shapes, which is not limited in this embodiment. It is understood that in other embodiments, the number of LED beads 311 can also be one or more, and the plurality of LED beads 311 can be arranged in other ways, which is not limited in this embodiment.
[0044] In another implementation, see Figure 4 , Figure 4 The structure of the first light source 31 is shown. The first light source 31 includes multiple integrated light-emitting chips 312. In this case, the first light source system 30 includes a single lens for collecting the light emitted from the multiple light-emitting chips. Compared to a solution where each LED bead requires a collecting lens, this embodiment has a lower cost. Similarly, the second light source 41 and the third light source 51 can both adopt the same structure, and this embodiment does not limit them.
[0045] Please continue reading. Figure 1In this embodiment, the illumination device 10 may further include a light homogenizing system 11. The light homogenizing system 11 is disposed in the optical path of the illumination light and is used to homogenize the illumination light, which is the combined light of the first ray, the second ray, and the third ray. The light homogenizing system 11 may be one or more of a diffuser, a double compound eye lens, a single compound eye lens, a light bar, etc., and this embodiment does not limit this. An aperture 13 is disposed in the optical path of the light beam homogenized by the light homogenizing system 11. The aperture 13 can be used to shape the light beam, cutting it into the required shape. The lens 14 receives the light beam after passing through the aperture 13 and projects it outward.
[0046] In some embodiments, the lighting device 10 may also include a focusing system 12, which is disposed in the optical path between the aperture 13 and the light homogenizing system 11. The focusing system 12 is used to focus the homogenized light and guide it to the aperture 13 to improve light utilization.
[0047] Because the first ray (green light) is generated by exciting green phosphor with the second ray (blue light), the resulting first ray is impure, leading to a poor color gamut in the subsequent combination with the second and third rays. (See also...) Figure 5 In some embodiments, the lighting device 10 may also include a filter 15, which may be disposed between the aperture 13 and the light uniform system 11. The filter 15 may filter the first light in the lighting light to obtain pure green light and improve the color gamut of the combined lighting light. Figure 6 A coating curve for a filter 15 is shown, where the horizontal axis represents wavelength and the vertical axis represents transmittance. The filter 15 can, for example, be configured to filter light with wavelengths in the range of 550nm-600nm, meaning the filter 15 can block light in this range from passing through, resulting in purer green light after passing through the filter 15. In another embodiment, the filter 15 can also be positioned between the aperture stop 13 and the lens 14, similarly serving to filter the first light beam.
[0048] In the lighting device 10 provided in this embodiment, the first wavelength conversion device 33 in the first light source system 30 is excited from the first surface direction by the first light source 31, and at the same time, the second light emitted from the excited light module 60 is excited from the second surface direction, realizing bidirectional excitation, improving the excitation efficiency and increasing the brightness of the first light. Thus, the white light formed after combining with the second and third light rays is brighter.
[0049] Example 2
[0050] See Figure 7This embodiment provides another lighting device 10, which differs from the first embodiment in that the structure of the light-diffusing system 11 is different in this embodiment. The following only describes in detail the differences between this embodiment and embodiment 1. For any parts not covered in detail, please refer to the content of the foregoing embodiments.
[0051] In this embodiment, the light-diffusing system 11 is a light-diffusing rod, which can be a round rod, a square rod, a hexagonal square rod, etc. The light-diffusing rod can be disposed between the light-focusing system 12 and the aperture 13.
[0052] In the lighting device 10 provided in this embodiment, the first wavelength conversion device 33 in the first light source system 30 is excited from the first surface direction by the first light source 31, and at the same time, the second light emitted from the excited light module 60 is excited from the second surface direction, realizing bidirectional excitation, improving the excitation efficiency and increasing the brightness of the first light. Thus, the white light formed after combining with the second and third light rays is brighter.
[0053] Example 3
[0054] See Figure 8 This embodiment provides another lighting device 10, which differs from the first embodiment in that: in this embodiment, the lighting device 10 only includes a first light source system 30 and a second light source system 40, and the light combining system only includes a first light splitter 70. The following only describes in detail the differences between this embodiment and embodiment 1. For any parts not covered in detail, please refer to the content of the foregoing embodiments.
[0055] In this embodiment, the lighting device 10 includes a first light source system 30, a second light source system 40, an excitation light module 60, a light combining system, a light focusing system 11, an aperture 13, and a lens 14. The first light source system 30 is used to emit a first light beam, and the second light source system 40 can be used to emit a second light beam. The lens 14 projects the illumination light outward.
[0056] In this embodiment, the first light source can be yellow light, and the second light source can be blue light. For more details, please refer to [link / reference needed]. Figure 8 The first light source system 30 includes a first light source 31 and a first wavelength conversion device 33. The first light source 31 is disposed on a first heat sink 32, and the first wavelength conversion device 33 may be a phosphor sheet carrying yellow phosphor. The first wavelength conversion device 33 includes a first surface and a second surface facing away from each other. The first light source 31 is used to emit first excitation light, which is incident on the first surface and at least partially converted into first light rays. The first light rays pass through the first wavelength conversion device 33. The first light source 31 can excite the phosphor on the first surface of the first wavelength conversion device 33 to form the first light rays.
[0057] In this embodiment, the light combining system includes a first beam splitter 70, which is disposed on the outgoing light path of the first light and can transmit the first light. At the same time, the first beam splitter 70 can also reflect the second light. The first beam splitter 70 can be tilted relative to the optical axis direction of the first light, for example, tilted at 45°.
[0058] The excitation light module 60 is used to emit a second light beam. The second light beam emitted by the excitation light module 60 is incident on the first beam splitter 70, reflected by the first beam splitter 70, and after reflection, it passes through the collimation system 34 and is incident on the second surface of the first wavelength conversion device 33. At least part of it is converted into a first light beam on the second surface. This part of the first light beam generated by the excitation light beam is emitted towards the first light source 31 and reflected by the chip surface of the first light source 31 towards the first beam splitter 70. The first light beam emitted by the first light source system 30 is incident on the first beam splitter 70 and passes through the first beam splitter 70.
[0059] The excitation light module 60 is a blue LED module, and the excitation light module 60 emits blue light as a second light.
[0060] The second light source system 40 emits a second light beam, which is then combined with the first light beam. The second light source system 50 can be a blue light-emitting chip. The blue light combines with the yellow light, which serves as the first light beam, to form white illumination light.
[0061] In another embodiment, the first light emitted by the first light source system 30 is green light, and the second light source system 50 can also be used to simultaneously emit a second blue light and a third red light. Both the emitted second and third light can be reflected by the first beam splitter 70 and then combined with the first light before being emitted. At this time, the third light can be, for example, red light. The second light source system 40 integrates the blue light chip and the red light chip into one module. This arrangement can ensure the brightness of the white light formed after the light is combined, while reducing the volume of the entire lighting device 10 and shortening the length of the light source.
[0062] In this embodiment, the lighting device 10 also includes a focusing system 12, an aperture 13, a filter 15, a lens 14, etc., arranged in the same manner as in Embodiment 1, as described above. In other embodiments, the lighting device 10 may also include a light-diffusing system, arranged in the same manner as in the aforementioned embodiments.
[0063] In the lighting device 10 provided in this embodiment, the first wavelength conversion device 33 in the first light source system 30 is excited from the first surface direction by the first light source 31, and at the same time, the second light emitted from the excited light module 60 is excited from the second surface direction, realizing bidirectional excitation, improving the excitation efficiency and increasing the brightness of the first light, so that the light beam formed after subsequent combination with the second and third light rays is brighter.
[0064] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A lighting device, characterized in that, include: A first light source system, the first light source system includes a first light source and a first wavelength conversion device, the first wavelength conversion device includes a first surface and a second surface opposite to each other, the first light source is used to emit a first excitation light, the first excitation light enters the first wavelength conversion device from the first surface and is at least partially converted into a first light ray, the first light ray passes through the first wavelength conversion device. An excitation light module is used to emit a second light beam, which is guided to enter the wavelength conversion device from the second surface and is at least partially converted into a first light beam. A second light source system, which is used to emit a second light beam; A light combining system, wherein the light combining system is used to guide the first light ray and the second light ray to combine and then emit; A light-concentrating system, wherein the light-concentrating system is used to converge the combined light rays; An aperture, wherein the aperture is positioned on the optical path of the combined light rays; as well as A lens, which is used to project light outward.
2. The lighting device according to claim 1, characterized in that, The light combining system includes a first beam splitter, which can transmit the first light and reflect the second light. The second light emitted from the excitation light module is reflected by the first beam splitter to the second surface and is at least partially converted into the first light. The second light emitted from the second light source system is reflected and combined with the first light transmitted through the first beam splitter before being emitted.
3. The lighting device according to claim 2, characterized in that, The second light source system is also used to emit a third ray.
4. The lighting device according to claim 2, characterized in that, The lighting device further includes a third light source system for emitting a third light ray, and a light combining system for guiding the first light ray, the second light ray, and the third light ray to combine before emitting.
5. The lighting device according to claim 4, characterized in that, The light combining system further includes a second beam splitter, which can reflect a third ray and transmit other rays. The third ray emitted from the third light source system is incident on the second beam splitter and reflected. The first ray and the second ray emitted from the second light source system are combined and then transmitted through the second beam splitter to combine with the third ray before being emitted.
6. The lighting device according to claim 1, characterized in that, The first light source system further includes a collimation system, which is located in the optical path of the first light ray and is used to collimate the first light ray.
7. The lighting device according to any one of claims 1-6, characterized in that, The excitation light module is a blue LED module or a blue laser module.
8. The lighting device according to any one of claims 1-6, characterized in that, The first light source includes a plurality of LED beads arranged in an array, or the first light source includes a plurality of light-emitting chips integrated into one unit.
9. The lighting device according to any one of claims 1-6, characterized in that, The lighting device further includes a light homogenizing system, which is used to homogenize the light after light combining. The light homogenizing system is disposed between the light combining system and the light focusing system or between the light focusing system and the aperture.
10. The lighting device as claimed in claim 9, characterized in that, The lighting device further includes a filter, which is disposed between the aperture stop and the light equalization system, or between the aperture stop and the lens.