CN111237711A - Light source system and lighting device - Google Patents

Abstract

The invention discloses a light source system and an illuminating device. The light source system includes: a light emitting unit; a light circulation unit, including a light reflection surface and a light exit surface. The light-emitting surface exits, and the light-reflecting surface also reflects the light from the light-emitting surface back to the light-emitting surface; the light distribution control unit includes at least two transmission areas with different light transmittances, and the light reflected and transmitted by the light-reflecting surface passes through the light The distribution control unit emits uneven light distribution; the imaging unit images the uneven light to form illumination light. In the above manner, different illuminance distributions of a single light source are realized.

Description

Light source system and lighting device

technical field

The present invention relates to the technical field of lighting, and in particular, to a light source system and a lighting device.

Background technique

In lighting applications, such as automotive lighting applications, there are usually specific requirements for illuminance distribution, such as high central brightness and low edge brightness. Although defocusing, defocusing and other schemes can achieve a certain degree of light distribution adjustment, the adjustment range is limited. With the development of car lamp technology, imaging technology can provide information interaction function while realizing the illumination function of car lights, and become an important development direction of future car lights and other lighting applications. Therefore, the ability of car lights to realize lighting distribution is proposed. higher requirements.

In automotive lighting applications, in order to brighten or dim the area of illumination brightness, a high-brightness laser light source is usually used in the center and a low-brightness light source is used at the edge; or, multiple optical systems are used to achieve different illumination distributions, and the Stacked or integrated to meet final luminance distribution needs. All of the above methods need to be implemented by using multiple light sources and supporting optical systems, and need to provide different power management according to the power of different light sources, which is costly and complicated in structure.

SUMMARY OF THE INVENTION

The main technical problem to be solved by the present invention is to provide a light source system and an illuminating device with a simple structure and low cost, so as to realize different illuminance distributions of a single light source.

In order to solve the above-mentioned technical problems, a technical scheme adopted in the present invention is:

A light source system is provided, comprising: a light-emitting unit that emits light; a light-circulating unit, including a light-reflecting surface and a light-emitting surface, the light emitted by the light-emitting unit is reflected and conducted in the light-circulating unit through the light-reflecting surface, and The light is emitted from the light exit surface, and the light reflection surface reflects at least part of the light from the light exit surface back to the light exit surface; the light distribution control unit, located on the light exit surface of the light circulation unit, includes at least a portion of the light from the light exit surface. Two transmission areas with different light transmittances, the light reflected and transmitted by the light reflection surface passes through the light distribution control unit and then exits with uneven light distribution; and an imaging unit, which images the uneven light form illuminating light.

Provided is a lighting device including the above-mentioned light source system.

The beneficial effects of the present invention are: different from the situation in the prior art, the light distribution control unit in the light source system of the present invention includes at least two transmission regions with different light transmittances, and the light emitted by the light emitting unit passes through the The reflective surface transmits and conducts in the light recycling unit and exits from the light exit surface, the light reflecting surface reflects at least part of the light from the light exit surface back to the light exit surface, through the light distribution The at least two transmission areas with different light transmittances on the control unit are emitted with uneven light distribution, and then the uneven light is imaged by the imaging unit to form illumination light, thereby replacing the complex optical structure design with a simple optical structure. The design of the light source and power supply system realizes the different illuminance distribution of a single light source.

Description of drawings

FIG. 1 is a schematic structural diagram of a first embodiment of a light source system of the present invention;

2 is a schematic structural diagram of a second embodiment of a light source system of the present invention;

3 is a schematic structural diagram of a third embodiment of the light source system of the present invention;

4 is a schematic structural diagram of a fourth embodiment of a light source system of the present invention;

5 is a schematic structural diagram of the lighting device of the present invention;

6a is a schematic view of the structure of the light exit surface of the light recycling unit of the present invention;

6b is a schematic diagram of the distribution of different light transmittance regions on the light exit surface of the light recycling unit of the present invention;

Fig. 7 is the simulation schematic diagram of luminous flux on the light exit surface of the light source system of the present invention;

FIG. 8 is a schematic diagram of illuminance simulation on the light exit surface of the light source system of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

Please refer to FIG. 1 , which is a schematic structural diagram of a first embodiment of a light source system of the present invention. The light source system 100 includes: a light emitting unit 10 , a light recycling unit 20 , a light distribution control unit 30 and an imaging unit 40 . The light-emitting unit 10 is used for emitting light; the light-circulating unit 20 includes a light-reflecting surface 23 and a light-exiting surface 22, and the light emitted by the light-emitting unit 10 is reflected and conducted in the light-circulating unit 20 through the light-reflecting surface 23, and is emitted from the light-exiting surface 22, The light reflecting surface 23 reflects at least part of the light from the light exiting surface 22 back to the light exiting surface 22 . Wherein, the light reflection surface 23 is arranged around the light exit surface 22 . The light distribution control unit 30 is located on the light exit surface 22 of the light recycling unit 20, and includes at least two transmission areas with different light transmittances. Light distribution exits. The imaging unit 40 images the uneven light to form illumination light.

In this embodiment, the light distribution control unit 30 includes two transmission regions with different light transmittances, a central region 31 and an edge region 32 surrounding the central region 31 , and the light transmittance of the central region 31 is greater than that of the edge region 32 transmittance. In other embodiments, the light distribution control unit 30 may include a plurality of transmission regions with different light transmittances, and the light transmittance of each transmission region may be set according to requirements.

The light reflecting surface 23 is provided with a high reflectivity coating to increase reflection and reduce light loss. The light reflecting surface 23 can also be directly made of high reflectivity material. The light reflecting surface 23 reflects at least part of the light from the light exiting surface 22 back to the light exiting surface 22 while reflecting and conducting the light entering the light recycling unit 20 through the light reflecting surface 23 to improve light utilization. The high reflectivity coating is specifically a coating with a reflectivity of more than 90%, which can be a metal coating, such as a silver reflective film, an aluminum reflective film, or a dielectric layer coating, such as a composite coating of multiple layers with different refractive indices.

Wherein, the light recycling unit 20 is a solid optical waveguide or a hollow optical device. In this embodiment, the light recycling unit 20 is a solid cone rod.

In this embodiment, the light distribution control unit 30 is a selective light transmission film, which is located on the light exit surface 22 of the light recycling unit 20 and is integral with the light recycling unit 20 . In other embodiments, the light distribution control unit 30 may also be disposed on the light exit surface 22 of the light recycling unit 20 in other separate forms, which are not specifically limited herein.

In this embodiment, the light-emitting unit 10 is a laser light-emitting unit that emits laser light. The light-emitting unit 10 is located outside the light-recycling unit 20, and the light-recycling unit 20 is provided with a wavelength selective transmission region 24 at a position close to the light-emitting unit 10, corresponding to the position of the light-emitting unit 10; and a light reflecting surface 23 in the light-recycling unit 20 A wavelength conversion unit 25 is provided, and the wavelength conversion unit 25 converts the laser light into fluorescence and emits it.

As shown in FIG. 1 , the light emitting unit 10 includes two lasers (a first laser 11 and a second laser 12 ), that is, a laser light emitting unit. The first laser 11 emits the first laser 111 , the second laser 12 emits the second laser 121 , and the wavelength selective transmission region 24 includes a first region 241 and a second region 242 . The first laser 111 enters the light recycling unit 20 through the first area 241 (the first area 241 transmits the first laser 111 and reflects other light), and the second laser 121 passes through the second area 242 (the second area 242 makes the second laser 111 pass through the second area 242 ). The laser light 121 transmits and reflects other light) into the light recycling unit 20 . The first laser light 111 and the second laser light 121 are reflected and conducted by the light reflection surface 23 and then reflected to the wavelength conversion unit 25 , and the wavelength conversion unit 25 converts the first laser light 111 into the first fluorescent light 112 , and the first fluorescent light 112 is incident on the light exit surface 22 The edge area 32 (low transmittance area) of the light distribution control unit 30 on the light distribution unit 30 forms less first fluorescent transmitted light beam 1121 and more first fluorescent reflected light beam 1122; the wavelength conversion unit 25 converts the second laser light 121 into The second fluorescent light 122 , the second fluorescent light passes through the middle area 31 (high light transmittance area) of the light distribution control unit 30 on the light exit surface 22 to form more second fluorescent light transmitted through beam 1221 and less second fluorescent reflected light beam 1222 . The first fluorescent reflection beam 1122 and the second fluorescent reflection beam 1222 are reflected and circulated by the light reflection surface 23 again in the light recycling unit 20, and are incident through the middle area 31 and the edge area 32. After multiple reflection cycles, the light reflection surface 23 will enter The light in the light recycling unit 20 is emitted as much as possible, so as to improve the light extraction efficiency. Finally, all transmitted light beams emitted from the middle region 31 (high light transmittance region) of the light exit surface 22 are high-brightness light B, and all light beams emitted from the edge region 32 (low light transmittance region) of the light exit surface 22 The transmitted light beam is low-brightness light A. The high-intensity light B and the low-intensity A light are imaged and emitted by the imaging unit 40 to form illumination light with uneven brightness distribution with high intermediate brightness and low edge brightness, which is the same as that on the light exit surface 22 , thereby making the lighting applied by the light source system 100 The device achieves uneven illumination distribution.

The first laser 11 and the second laser 12 may emit monochromatic laser light of the same color, or may be monochromatic laser light of different colors.

In other embodiments, the light-emitting unit 10 may further include a plurality of laser light-emitting units.

Please refer to FIG. 2 , which is a schematic structural diagram of a second embodiment of the light source system of the present invention. The difference from FIG. 1 is that the light recycling unit 20 further includes a light incident surface 21 , and the light emitted by the light emitting unit 10 enters the light recycling unit 20 through the light incident surface 21 , and is reflected and conducted by the light reflecting surface 23 , and then passes through the light exit surface 22 . shoot.

In this embodiment, the light emitted by the light emitting unit 10 has the same color as the illumination light. Here, the light-emitting unit 10 that emits the same color as the illumination light is referred to as the illumination light-emitting unit 10'. "Same color" as used in this application means that the spectrum is approximately the same, and the peak wavelengths fall into the same color range. The light-emitting unit 10 is located outside the light-recycling unit 20, and corresponds to the light-incident surface 21 of the light-recycling unit 20; There are gaps 15 between 20 . There is a difference in refractive index between the gap 15 and the light incident surface 21 coated with the anti-reflection film 26, so that the anti-reflection film 26 can reduce the reflection loss of the incident illumination light and improve the light incidence efficiency.

As shown in FIG. 2, the illumination light emitting unit 10' emits illumination light rays (including first rays 11' and second rays 12'). The first light 11' and the second light 12' enter the light recycling unit 20 through the light incident surface 21 of the light recycling unit 20, and the light incident surface 21 is coated with an anti-reflection film 26, so that the first light 11' and the second light 12 'Reduce the reflection loss when entering the light recycling unit 20 to improve the light incidence efficiency. The first light 11 ′ is reflected and conducted on the light reflection surface 23 of the light recycling unit 20 provided with the high reflectivity coating, and the middle area 31 (high light transmittance area) of the light distribution control unit 30 incident on the light exit surface 22 is formed. More first light rays pass through the light beam 111 ′ and less first light rays reflect the light beam 112 ′; the second light rays 12 ′ are reflected and conducted on the light reflecting surface 23 provided with the high reflectivity coating of the light recycling unit 20 , and the incident light exits The edge region 32 (low light transmittance region) of the light distribution control unit 30 on the surface 22 forms less second light transmission beam 121 ′ and more second light reflection beam 122 ′. The first light reflection beam 112 ′ and the second light reflection beam 122 ′ are reflected and circulated by the light reflection surface 23 again in the light circulation unit 20 , and incident through the middle area 31 and the edge area 32 . After multiple reflection cycles, the light reflection surface 23 The light entering the light recycling unit 20 is emitted as much as possible to improve the light extraction efficiency. Finally, all transmitted light beams emitted from the middle region 31 (high light transmittance region) of the light exit surface 22 are high-brightness light b, and all light beams emitted from the edge region 32 (low light transmittance region) of the light exit surface 22 The transmitted light beam is low-brightness light a. The high-intensity light b and the low-intensity light a are emitted by the imaging unit 40 to form an illuminating light with uneven brightness distribution with high intermediate brightness and low edge brightness, which is the same as the light-emitting state on the light exit surface 22 , so that the lighting applied by the light source system 100 is formed. The device achieves uneven illumination distribution.

The illuminating light emitted by the illuminating light emitting unit 10' may be a single-color LED light or a composite light source (such as a composite light of multiple color light sources).

Please refer to FIG. 3 , which is a schematic structural diagram of a third embodiment of the light source system of the present invention. The difference from FIG. 2 is that the light emitting unit 10 is located inside the light recycling unit 20 and is located on the opposite surface of the light exit surface 22 . In this embodiment, the light emitting unit 10 is located on the light incident surface 21 .

The light emitted by the light emitting unit 10 can be directly incident on the light reflecting surface 23 of the light recycling unit 20 , which reduces the reflection loss when the light enters the light recycling unit 20 .

The process of forming light with uneven brightness distribution so that the lighting device using the light source system 100 realizes uneven brightness distribution is the same as that in the second embodiment, and will not be repeated here.

Please refer to FIG. 4 , which is a schematic structural diagram of a fourth embodiment of the light source system of the present invention. The difference from FIG. 3 is that the light emitting unit 10 is located inside the light recycling unit 20 and is located on the adjacent surface of the light exit surface 22 . In this embodiment, the light emitting unit 10 is located on the light reflecting surface 23 .

The light emitted by the light emitting unit 10 can be directly incident on the light reflection surface 23 of the light recycling unit 20, so that the light can be fully homogenized before reaching the light exit surface 22, which is conducive to the formation of the expected output light distribution, and avoids the beam from being unintentional. The deviation of the outgoing light distribution caused by directly reaching the light exit surface 22 is homogenized.

The process of forming light with uneven brightness distribution so that the lighting device using the light source system 100 realizes uneven brightness distribution is the same as that in the second embodiment, and will not be repeated here.

Please refer to FIG. 5 , which is a schematic structural diagram of the lighting device of the present invention. The lighting device 200 includes the above-mentioned light source system 100 .

The light source system 100 is used to form light with uneven brightness distribution, so that the lighting device 200 using the light source system 100 can achieve uneven brightness distribution through a single light source. The lighting device can be applied to the fields of patterned lighting of vehicle lights, stage lighting, architectural lighting and the like.

FIG. 6a is a schematic diagram of the distribution of different transmission regions on the light exit surface 22 of the present invention. The coordinate system is established by taking the midpoint O of the light exit surface 22 on which the light distribution control unit 30 is disposed as the origin, and the length of the light exit surface 22 is x and the width is y. 6b is a schematic diagram of the position distribution of the transmission area of the light distribution control unit 30 disposed on the light exit surface 22 in the form of a coating (selective light transmission film), and the light transmittances of the regions A1 to A5 are 100% and 80% in sequence. , 50%, 20%, 5%. 7 and 8, where A1-A5 correspond to B1-B5 and C1-C5 positions, it can be seen that the luminous flux distribution increases with the increase of the light transmittance, and the illuminance also increases at the same time, that is, It is realized that the light source system 100 of the present invention is provided with transmission areas with different light transmittances on the light exit surface 22 to control the light that forms uneven brightness distribution, thereby enabling the lighting device 200 using the light source system 100 to achieve uneven illumination distribution. .

In the present invention, two kinds of coating films with different light transmittances are arranged on the light emitting surface of the light recycling unit, so that the light entering the light recycling unit is emitted through different transmission areas on the light emitting surface to form light with uneven brightness distribution. Then, through the imaging unit, the light with uneven brightness distribution is imaged to form illumination light, and the complex light source and power system design is replaced by a simple optical structure design, so as to realize the different illumination distribution of a single light source. At the same time, through the high reflectivity coating on the light reflection surface of the light recycling unit, the incoming light is reflected as much as possible for multiple cycles, and the light reflection surface will also reflect at least part of the light from the light exit surface back to the light exit surface, so that Improve light extraction efficiency. The peripheral light-emitting unit corresponds to the light incident surface, and emits illumination light. An anti-reflection film is arranged on the light incident surface to reduce the incident light reflection and improve the light incident efficiency; the peripheral light-emitting unit and the light reflection surface selectively transmit wavelengths The laser light is emitted to the wavelength conversion unit, and the laser light is converted into fluorescent light, which is then emitted through the transmission area with different light transmittance to form fluorescent light with uneven brightness distribution. The above-mentioned light source system is applied to a lighting device, so that the lighting device can realize different illuminance distributions with a single light source, and has a simple structure and low cost.

The above are only the embodiments of the present invention, and are not intended to limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, All are similarly included in the scope of patent protection of the present invention.

Claims (10)

1. A light source system, comprising:

a light emitting unit emitting light;

the light emitted by the light emitting unit is reflected and conducted in the light circulating unit through the light reflecting surface and emitted from the light emitting surface, and at least part of light from the light emitting surface is reflected back to the light emitting surface by the light reflecting surface;

the light distribution control unit is positioned on the light emitting surface of the light circulation unit, comprises at least two transmission areas with different light transmittances, and emits the light reflected and conducted by the light reflecting surface in uneven light distribution after passing through the light distribution control unit; and

and an imaging unit that images the non-uniform light to form illumination light.

2. The light source system according to claim 1, wherein the transmission region includes a central region and an edge region surrounding the central region, and the light transmittance of the central region is greater than that of the edge region.

3. The light source system of claim 1, wherein the light reflecting surface is provided with a high reflectivity coating.

4. The light source system according to claim 3, wherein the light distribution control unit is a selectively light-transmitting film and is disposed on the light exit surface of the light recycling unit.

5. The light source system according to claim 3, wherein the light emitting unit emits light of the same color as the illumination light;

the light circulation unit further comprises a light incidence surface, the light emitting unit is positioned outside the light circulation unit, and light emitted by the light emitting unit enters the light circulation unit through the light incidence surface; and

the light incidence surface of the light circulation unit is provided with an antireflection film, and a gap is formed between the illumination light emitting unit and the light circulation unit.

6. The light source system according to claim 1, wherein the light emitting unit is a laser light emitting unit that emits laser light;

the light-emitting unit is positioned outside the light circulation unit, and a wavelength selective transmission area is arranged at the position, close to the light-emitting unit, of the light circulation unit and corresponds to the light-emitting unit; and

and a light reflection surface in the light circulation unit is provided with a wavelength conversion unit, the laser enters the light circulation unit, and the wavelength conversion unit converts the laser into fluorescence to be emitted.

7. A light source system according to claim 3, wherein the light emitting unit is located inside the light recycling unit and opposite to the light exit surface.

8. A light source system according to claim 3, wherein the light emitting unit is located inside the light recycling unit and at an adjacent surface of the light exit surface.

9. The light source system according to claim 1, wherein the light emitted by the light emitting unit is a monochromatic laser light or a monochromatic LED light or a composite light; the light circulation unit is a solid optical waveguide or a hollow optical device.

10. A lighting device comprising the light source system according to any one of claims 1 to 9.

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