CN107036033B

CN107036033B - Light emitting device and lighting system

Info

Publication number: CN107036033B
Application number: CN201710433894.7A
Authority: CN
Inventors: 黄帆; 龙涛; 邹诚; 韩捷飞; 初宁
Original assignee: Supervision Laser Technology Suzhou Co ltd
Current assignee: Supervision Laser Technology Suzhou Co ltd
Priority date: 2017-06-09
Filing date: 2017-06-09
Publication date: 2023-07-07
Anticipated expiration: 2037-06-09
Also published as: CN107036033A

Abstract

The invention discloses a light-emitting device and a lighting system, comprising: the laser device comprises an excitation light unit, a wavelength conversion unit and a reflection unit, wherein the excitation light unit comprises a laser source unit and an LED light source unit, the position of the wavelength conversion unit corresponds to the focus of the reflection unit, laser beams emitted by the laser source unit and light beams emitted by the LED light source unit are respectively projected onto the wavelength conversion unit and excite fluorescence, and the fluorescence is emitted according to a specified direction after being reflected by the reflection unit. According to the invention, the laser source unit is arranged in the excitation light unit, so that the emitted laser beam has the characteristics of good collimation and concentrated energy, and the ultra-high-brightness point light source is formed, so that the central illuminance of a far light field is improved, and the requirement of the far light field is met; the illumination of the central area and the edge area of the light field can be accurately adjusted through the matching of the laser source unit and the LED light source unit, so that the light distribution meeting the automobile high beam illumination standard can be obtained with minimum power, and the energy-saving effect can be achieved while the illumination standard is met.

Description

Light emitting device and lighting system

Technical Field

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

Background

With the development of semiconductor technology, LED (Light Emitting Diode ) light sources are gradually replacing traditional incandescent lamps and energy-saving lamps due to the advantages of high efficiency, energy saving, environmental protection, low cost, long service life and the like, and become a general illumination light source.

In the existing LED automobile headlight, an LED light source is positioned at the focus of a car light reflector, light beams emitted by the LED light source are collected by the car light reflector and distributed by a rear-end optical system (comprising a baffle, a lens and the like), and finally required far and near light field distribution is projected. The light distribution of the dipped beam of the automobile headlight meeting the requirements can be obtained, however, when the high beam distribution is formed, the problem that the central illuminance is obviously insufficient usually exists due to the limitation of the brightness of the current LED light source, and the LED light source is difficult to meet the requirements in the application fields such as stage lighting illumination, automobile headlight, projection display and the like which need the ultra-high brightness light source.

Disclosure of Invention

Aiming at the technical problems, the invention provides the light-emitting device and the lighting system which not only have far and near light field distribution and meet the central illuminance of a far light field, but also have simple structure.

In order to solve the technical problems, the technical scheme of the invention is as follows: a light emitting device, comprising: the laser device comprises an excitation light unit, a wavelength conversion unit and a reflection unit, wherein the excitation light unit comprises a laser source unit and an LED light source unit, the position of the wavelength conversion unit corresponds to the focus of the reflection unit, the laser beam emitted by the laser source unit and the light beam emitted by the LED light source unit are respectively projected onto the wavelength conversion unit and excite fluorescence, and the fluorescence is emitted according to the appointed direction after being reflected by the reflection unit.

Further, the LED light source unit corresponds to the position of the wavelength conversion unit and is located at the same side of the reflection unit.

Further, the laser source unit and the wavelength conversion unit are respectively arranged at two sides of the reflection unit, and the reflection unit is provided with a light transmission part for transmitting the laser beam.

Further, an included angle between the laser beam and the reflecting unit is 80-90 degrees, and the position of the light transmitting part corresponds to the position of the laser beam.

Further, the laser source unit comprises one or more laser sources, and the light transmission part is provided with one or more laser sources.

Further, the laser source unit further comprises one or a combination of two or more of a collimation unit, a beam angle changing unit and a focusing unit, and the collimation unit, the beam angle changing unit and the focusing unit are arranged along the light path.

Further, the LED light source unit includes a substrate and at least one LED light source, the wavelength conversion unit includes at least one fluorescent layer, the fluorescent layer is disposed on the LED light source or on the substrate, and one fluorescent layer corresponds to each LED light source above, and the lower Fang Sheyu is disposed on the substrate.

Further, the reflection unit is a curved mirror, the wavelength conversion unit is located at the focal point of the curved mirror, the laser beam is projected to the central area of the upper surface of the wavelength conversion unit, at least one of the LED light sources and the fluorescent layers is arranged respectively, when the number of the LED light sources and the number of the fluorescent layers are multiple, the fluorescent layers are closely arranged and located at the focal point of the curved mirror, one fluorescent layer is corresponding to each of the upper parts of the LED light sources, and a reflection interface is arranged between the LED light sources and the substrate.

Further, the reflection unit is formed by splicing a plurality of curved mirrors, the wavelength conversion unit is located at the focus of the curved mirrors, the laser beam is projected to the central area of the upper surface of the wavelength conversion unit, 2n+1 light sources and fluorescent layers are respectively arranged, n is a natural number more than or equal to 1, the fluorescent layers are distributed among the fluorescent layers, each fluorescent layer is located at the focus of a corresponding curved mirror, a fluorescent layer is corresponding to the upper side of each LED light source, and a reflection interface is arranged between each LED light source and the substrate.

Further, a heat dissipation base is arranged below the substrate.

The invention also provides a lighting system, which comprises the light-emitting device, a baffle plate and a projection lens, wherein the baffle plate and the projection lens are positioned at the light outlet of the light-emitting device, the reflecting unit is in an ellipsoidal structure, the wavelength conversion unit is positioned at the focus of the reflecting unit, which is close to the inner side, and the baffle plate is positioned at the focus of the reflecting unit, which is close to the outer side.

Compared with the prior art, the light-emitting device and the lighting system provided by the invention have the following advantages:

(1) The laser source unit and the LED light source unit are arranged in the excitation light unit, wherein the laser beam emitted by the laser source unit has the characteristics of good collimation and concentrated energy, and can form a point light source with ultra-high brightness, so that the central illuminance of a far light field is improved, and the requirement of the far light field is met; the light beam emitted by the LED light source unit has large diffusion angle and meets the requirement of a near light field;

(2) The laser source unit is turned on or turned off, so that free switching between a far light field and a near light field is realized, the operation is simple, and the use is convenient;

(3) The illumination of the central area and the edge area of the light field can be accurately adjusted by matching the laser source unit and the LED light source unit, so that the light distribution meeting the automobile high beam illumination standard can be obtained with minimum power, and the energy-saving effect can be achieved while the illumination standard is met;

(4) The invention has the advantages of simple and compact structure, small volume, low cost, convenient disassembly and assembly and good stability, and practically meets the requirements of practical application.

Drawings

Fig. 1 is a schematic diagram of a structure of a light emitting device in embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a fluorescent layer and an LED light source unit in embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a light field formed by the light emitting device in embodiment 1 of the present invention;

FIG. 4 is a schematic view of the laser beam of FIG. 3 projected onto a phosphor layer;

FIG. 5 is a schematic diagram of one of the wavelength converting units in embodiment 2 of the present invention;

FIG. 6 is a schematic diagram of one of the wavelength converting units in embodiment 4 of the present invention;

FIG. 7 is a schematic view of a reflecting unit in embodiment 4 of the present invention;

FIG. 8 is a schematic view of a reflection unit in embodiment 6 of the present invention;

fig. 9 is a schematic view showing one configuration of an illumination system in embodiment 7 of the present invention.

The figure shows: 11. a laser source unit; 110. a laser source; 111. a beam angle changing unit; 112. a focusing unit; 12. an LED light source unit; 121. a substrate; 122. an LED light source; 123. a reflective interface; 20. a wavelength conversion unit; 210. a fluorescent layer; 30. a reflection unit; 31. a light transmission part; 310. a curved mirror; 40. a heat dissipation base; 50. a baffle; 60. a projection lens; 70. a light field center region; 71. light field edge regions.

Detailed Description

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

Example 1

As shown in fig. 1, the present invention provides a light emitting device including: the laser device comprises an excitation light unit, a wavelength conversion unit 20 and a reflection unit 30, wherein the excitation light unit comprises a laser source unit 11 and an LED light source unit 12, the position of the wavelength conversion unit 20 corresponds to the focus of the reflection unit 30, the laser beam emitted by the laser source unit 11 and the light beam emitted by the LED light source unit 12 are respectively projected onto the wavelength conversion unit 20 and excite fluorescence, the fluorescence is reflected by the reflection unit 30 and then emitted in a specified direction to form a light beam travelling in a specified solid angle, and in the invention, the fluorescence excited by the wavelength conversion unit 20 is reflected by the reflection unit 30 to form parallel light to be emitted, namely the parallel illumination light, because the wavelength conversion unit 20 is positioned at the focus of the reflection unit 30. The laser source unit 11 and the LED light source unit 12 are arranged in the excitation light unit, wherein the laser beam emitted by the laser source unit 11 has the characteristics of good collimation and concentrated energy, and can form a point light source with ultra-high brightness, so that the central illumination of a far light field is improved; the light beam emitted by the LED light source unit 12 has a large diffusion angle and meets the requirement of the near light field, so that the free switching between the far light field and the near light field can be realized by switching on or switching off the laser source unit 11, and the use is convenient.

The light emitting device and the lighting system provided in the present invention can be applied to the application fields of stage lamps, automobile headlamps, projection displays and the like, which require ultra-high brightness light sources, and an automobile lighting lamp (mainly referred to as a head lamp) is taken as an example in the following description, but the invention is not limited thereto.

With continued reference to fig. 1, the LED light source unit 12 corresponds to the position of the wavelength conversion unit 20, and is located on the same side of the reflection unit 30, that is, the light beam emitted from the LED light source unit 12 is directly projected onto the wavelength conversion unit 20 and excites fluorescence. Of course, the LED light source unit 12 may also be disposed on the other side of the wavelength conversion unit 20 opposite to the reflection unit 30, but since the light beam emitted by the LED light source unit 12 has a large spread angle, if the distance from the LED light source unit to the wavelength conversion unit 20 is too long, additional components such as a converging lens group need to be adopted to converge the light beam, which has high structural complexity and troublesome installation and debugging, so that the LED light source unit 12 is located close to the wavelength conversion unit 20 without additional components, thereby greatly reducing the structural complexity and cost of the device. In addition, in this embodiment, the wavelength conversion unit 20 is detachably mounted on the LED light source unit 12, so that both can be prevented from moving relatively when in use, the stability of the device is improved, and meanwhile, the LED light source unit 12 or the wavelength conversion unit 20 can be replaced conveniently, and the convenience in use is improved.

With continued reference to fig. 1, the laser source unit 11 and the wavelength conversion unit 20 are disposed on two sides of the reflection unit 30, and the reflection unit 30 is provided with a light transmitting portion 31 for transmitting the laser beam. Specifically, the number of the light transmitting portions 31 may be one or more, and may be a through hole, a through hole provided with a transparent member that is transparent to the laser beam, or a transparent member that is transparent to the laser beam and is integrated with the reflecting unit 30, and the transparent member that is transparent to the laser beam may be a transparent plate with a filter that is transparent to the laser beam and reflects the fluorescent light emitted from the wavelength converting unit 20, that is, white light, at the same time, so that the fluorescent light emitted from the wavelength converting unit 20 is prevented from leaking from the light transmitting portions 31. The light passing portion 31 is used to guide the laser beam to the wavelength conversion unit 20, which may be elliptical, circular or other shape, and has a size adapted to the diameter of the laser beam so as to pass the laser beam. The laser source unit 11 is mounted on the other side of the wavelength conversion unit 20 opposite to the reflection unit 30, so that the structure and position of the laser source unit 11 can be flexibly designed and replaced according to the space conditions of use, and the laser source unit 11 can be mounted on the same side of the wavelength conversion unit 20 opposite to the reflection unit 30 as the LED light source unit 12, so that the structure of the light emitting device can be further simplified.

Preferably, the included angle between the laser beam and the reflecting unit 30 is 80-90 °, and the position of the light-transmitting portion 31 corresponds to the position of the laser beam, that is, the included angle between the laser beam and the light-transmitting portion 31 is 80-90 °, specifically, the laser beam is made to be incident on the reflecting unit 30 at an angle close to 90 °, so that the area of the light-transmitting portion 31 can be reduced, and meanwhile, the layout compactness between the laser source unit 10 and the reflecting unit 30 is improved, and the occupied space is reduced.

Preferably, the laser source unit 11 includes one or more laser sources 110, specifically designed according to the power of the output light, especially the central illuminance, and of course, a plurality of laser sources 110 may be disposed in the laser source unit 11, where the number of the laser sources 110 that currently operate is selected according to needs during use, for example, by selecting elements such as a switch, so that the convenience of use and the general performance can be further improved. The number of the light-transmitting parts 31 is one or more, specifically, when there is only one laser source 110, one light-transmitting part 31 is correspondingly provided; when the number of the laser sources 110 is more than or equal to 2, the number of the light-transmitting portions 31 may be only one, and at this time, the light beams emitted by the laser sources 110 share one light-transmitting portion 31; of course, a plurality of light-transmitting portions 31 may be provided, corresponding to the laser sources 110 one by one, and each light-transmitting portion 31 is configured to guide the laser beam emitted from the corresponding laser source 110 to the wavelength conversion unit 20. In this embodiment, the laser source 110 is preferably a semiconductor laser, that is, a laser diode, which has the characteristics of small volume and long service life, further reduces the volume of the device, and improves the service life and stability. The semiconductor laser used here may be an element having 1 light-emitting point on 1 chip, or may be an element having a plurality of light-emitting points on 1 chip.

With continued reference to fig. 1, the laser source unit 11 further includes one or a combination of two or more of a collimation unit (not shown), a beam angle changing unit 111, and a focusing unit 112, where the collimation unit, the beam angle changing unit 111, and the focusing unit 112 are disposed along the optical path. The collimating unit may be disposed at the outlet of the laser source 110, and a collimating lens or other beam collimating element is generally used to convert the laser output by the collimating unit into collimated parallel light, so as to further improve the collimation of the laser beam. The beam angle changing unit 111 is used for deflecting the laser beam to change the travelling direction of the laser beam, so that the whole system is compact in structure, the beam angle changing unit 111 can adopt a plane mirror or a curved mirror, a metal film or a dielectric film and the like, the same effect can be achieved, and of course, when the use space is not limited, the angle of the semiconductor laser can be directly adjusted, and the beam angle changing unit 111 is omitted, so that the cost is reduced. The focusing unit 112 may be a focusing lens or other focusing element for converging the laser beam to be better projected onto the wavelength conversion unit 20 through the light passing portion 31, and may be configured to form light of a suitable size when the laser beam is incident on the wavelength conversion unit 20 by adjusting a curved surface of the focusing unit 112, as shown in fig. 1, in the laser source unit 11, the collimating unit, the beam angle changing unit 111 and the focusing unit 112 are simultaneously used, and the three are sequentially arranged along the light path, however, in actual use, one of the collimating unit, the beam angle changing unit 111 and the focusing unit 112 may be selected to be used alone, or two or three of them may be selected to be used in combination, and the positions of the three may be arranged according to the use space, so long as it is ensured that the laser beam may be projected onto the wavelength conversion unit 20 through the light passing portion 31.

Preferably, the LED light source unit 12 includes a substrate 121 and at least one LED light source 122, the wavelength conversion unit 20 includes at least one fluorescent layer 210, the fluorescent layer 210 is disposed on the LED light source 122 or on the substrate 121, and one fluorescent layer 210 is disposed above each LED light source 122 and on the substrate 121 under Fang Sheyu.

As shown in fig. 2, in this embodiment, one LED light source 122 and one phosphor layer 210 are respectively disposed on the other, the phosphor layer 210 is disposed above the LED light source 122, and the lower side of the LED light source 122 is connected to the substrate 121 through the reflective interface 123, specifically, the substrate 121 has two functions, on one hand, to conduct the heat generated by the LED light source 122 downward, and on the other hand, an electrode is disposed on the substrate 121, and is connected to an external power source for supplying power to the LED light source 122. In this embodiment, the LED light source 122 is a light emitting diode, and is integrated on a chip, and emits a light beam, i.e. excitation light, through the spontaneous emission of the electrical input of the substrate 121, a part of the excitation light is transmitted upward and enters the fluorescent layer 210, so as to excite the fluorescent portion therein to generate fluorescence, and another part of the excitation light is transmitted downward and enters the reflective interface 123, and the reflective interface 123 has a higher reflectivity, so that the part of the light is reflected to the fluorescent layer 210 as well and excites the fluorescent portion therein to generate fluorescence, thereby fully utilizing the excitation light emitted by the LED light source 122 and improving the utilization rate of the LED light source 122.

In this embodiment, the fluorescent layer 210 is located above the LED light source 122, and is configured to receive the excitation light emitted from the LED light source 122 to generate the laser beams with different wavelengths, and meanwhile, the fluorescent layer 210 also receives the laser beams generated by the laser source 110 to output the laser beams. In addition, since the reflective interface 123 with high reflectivity is provided between the LED light source 122 and the substrate 121, it is ensured that almost all of the fluorescence output from the fluorescent layer 210 is emitted after being reflected by the reflection unit 30, and thus it is ensured that the fluorescent layer 210 has high light extraction efficiency. In this embodiment, the fluorescent layer 210 is detachably connected with the LED light source 122, so that the fluorescent layer is convenient to replace, and can be adhered to the LED light source 122 through an adhesion process, or can be arranged on the LED light source 122 through a transparent buckle or other parts, and of course, the fluorescent layer can also be connected in other manners as long as the detachable connection effect can be realized. The upper and lower surfaces of the fluorescent layer 210 can be respectively excited by the light output from the laser source 110 and the LED light source 122, so that the fluorescent layer 210 has higher brightness, and the requirement of high beam application in the automobile headlamp is met. Of course, the fluorescent layer 210 and the corresponding LED light source 122 may be encapsulated together, or even the wavelength conversion unit 20 and the LED light source unit 12 may be encapsulated together, so as to reduce the assembly difficulty and improve the stability of the relative positions of the two, however, in this manner, it is inconvenient to replace the fluorescent layer 210 or the LED light source 122, and in addition, the fluorescent layer 210 may not contact with the LED light source 122, such as suspended on the LED light source 122, so long as the relative positions of the two are ensured to be stable and unchanged.

The phosphor layer 210 may be a member in which phosphor particles are dispersed in an encapsulation substrate or a member in which phosphor particles are fixed. The encapsulation substrate of the fluorescent layer 210 is preferably a material having high transparency and high heat resistance, and may be a glass material (e.g., inorganic glass, organic-inorganic hybrid glass, or the like), or a resin material such as silicone resin. Wherein the glass material can use low-melting glass.

The fluorescent layer 210 can receive the excitation of the excitation light output from the LED light source 122, and further generate fluorescent light with a wavelength different from that of the excitation light; at the same time, excitation of the laser light output from the laser light source 110 may be received, and fluorescence having a wavelength different from that of the excitation light may be generated. When used as a light source of an automotive headlamp, the output light thereof must be white light having chromaticity within a predetermined range, as specified. Therefore, the phosphor contained in the phosphor layer 210 is selected so that the illumination light becomes white, and one preferable aspect is: the LED light source 122 outputs 405nm (blue-violet) or 450nm (blue) excitation light, and the laser light source 110 also outputs 405nm (blue-violet) or 450nm (blue) excitation light, and the fluorescent layer 210 at least includes yellow fluorescent powder that absorbs the excitation light and converts the excitation light into yellow light, so that the converted yellow light and unconverted blue light are mixed to generate white light. The wavelength of the excitation light emitted from the LED light source 122 and the wavelength of the laser light emitted from the laser light source 110 may be the same or different, and may be selected according to the actual application.

In this embodiment, the light beam emitted from the fluorescent layer 210 has a lambertian distribution, and after being reflected by the reflection unit 30, a desired light field distribution is formed in the far field. Preferably, the reflecting unit 30 is a curved mirror 310, and the curved mirror 310 may be a member having both surfaces coated with a metal thin film, a member made of metal, a member made of glass coated with a reflecting film, a member coated with a dielectric film, or the like, as long as a desired function is achieved, which is not limited herein. When the curved mirror 310 is made of glass, a reflective film may be coated in a region other than the light transmitting portion 31, and no through hole or a transparent member that can transmit laser light may be provided in the light transmitting portion 31, thereby simplifying the structure of the curved mirror 310. In addition, the surface of the curved mirror 310 in this embodiment may be a paraboloid, an ellipsoid or other curved surface, which only needs to satisfy the following conditions: at least a part of a curved surface (parabolic curved surface) formed by rotating a parabola with its symmetry axis as a rotation axis is cut by a plane of the rotation axis.

The wavelength conversion unit 20 is located at the focal point of the curved mirror 310, that is, the fluorescent layer 210 is located at the focal point of the curved mirror 310, so as to ensure that the fluorescent light emitted from the fluorescent layer 210 is emitted in the horizontal direction after being reflected by the curved mirror 310. In the existing automotive high beam lighting application, the brightness of the central area of the formed high beam field distribution is insufficient and the irradiation distance is insufficient due to the insufficient brightness of the LED light source 122, so that the laser beam emitted by the laser source 110 is used for exciting the fluorescent layer 210 in front of the automotive high beam lighting application, thereby improving the brightness of the light emitting device and meeting the application requirements of automotive high beam lighting. In addition, when the LED light source 122 does not emit light, the fluorescent layer 210 can be excited to generate strong enough laser to meet the requirement of the automobile high beam illumination by only adjusting the power of the incident laser.

Fig. 3 is a schematic view of the light emitting device of the present invention applied to automotive high beam illumination. For automotive high beam illumination, the required light field distribution is approximately elliptical, and when only the LED light source 122 is present, the following mapping relationship exists between the light field distribution formed and the light emitting surface of the LED light source 122: the light rays of the light field edge region 71 correspond to the light rays emitted from the edge portion of the LED light source 122, the light rays of the light field center region 70 correspond to the light rays emitted from the center portion of the LED light source 122, and in the application of the conventional LED light source 122 as a high beam illumination light source for an automobile, the illuminance of the light field center region 70 is insufficient and the illumination distance is insufficient due to insufficient illuminance of the center portion of the LED light source 122, so that the illuminance of the light field center region 70 can be improved only by focusing the laser beam on the center region (as shown in a black oval region in fig. 3) of the fluorescent layer 210, as shown in fig. 4. At this time, the brightness of the fluorescent layer 210 is uneven, that is, the brightness of the central area is high, the brightness of the edge area is low, so that the light distribution meeting the automotive high beam lighting standard can be obtained with the minimum power, and the energy consumption is low.

With continued reference to fig. 1, the light emitting device of the present invention further includes a heat dissipation base 40 disposed below the substrate 121. The heat dissipation base 40 is a supporting member of the LED light source unit 12, and functions to efficiently conduct heat generated by the LED light source unit 12 downward, and is preferably made of a metal or ceramic material having high thermal conductivity.

Example 2

Unlike embodiment 1, in this embodiment, the LED light sources 122 and the fluorescent layers 210 are respectively provided with a plurality of, i.e., more than or equal to 2, to obtain enough luminous flux, and the two are in one-to-one correspondence, at this time, the reflecting unit 30 is a curved mirror 310, the plurality of fluorescent layers 210 are closely arranged and located at the focal point of the curved mirror 310, the laser beam emitted by the laser source unit 11 is projected onto the central area of the wavelength conversion unit 20 formed by arranging the plurality of fluorescent layers 210, specifically, the plurality of fluorescent layers 210 (or the LED light sources 122) may be arranged at the focal point of the curved mirror 310 along a straight line or otherwise, and, of course, in order to improve the illumination uniformity, the arrangement formed pattern is preferably an axisymmetric or a centrosymmetric pattern.

As shown in fig. 5, the LED light sources 122 and the fluorescent layers 210 are respectively provided with three LED light sources 122 and fluorescent layers 210, which are closely arranged at the focal point of the curved mirror 310 along a straight line, wherein the second fluorescent layer 210 is located in the central area of the wavelength conversion unit 20, so that the laser beam is projected to the central area (as shown in a black oval area in fig. 5) of the upper surface of the second fluorescent layer 210 to excite the fluorescent material in the area, thereby increasing the illuminance of the central area 70 of the light field distribution, in this embodiment, the LED light sources 122 and the fluorescent layers 210 are in one-to-one correspondence, that is, one LED light source 122 is corresponding to the lower part of each fluorescent layer 20, and only one substrate 121 is provided with a plurality of electrodes on the substrate 121, so that each LED light source 122 can be simultaneously powered. In addition, it should be noted that, the fluorescent layer 210 may be detachably fixed on the corresponding LED light source 122 alone, and the fixing manner is the same as that of embodiment 1, so as to facilitate replacement, or a plurality of LED light sources 122 and the substrate 121 are packaged together, and meanwhile, a plurality of fluorescent layers 210 are packaged into a whole, and then the two packaged modules are mounted and fixed according to the one-to-one requirement, and of course, other manners may be adopted, so long as the LED light sources 122 and the fluorescent layers 210 are guaranteed to be in one-to-one correspondence, and the relative position is unchanged in the use process.

Example 3

Unlike embodiment 2, in this embodiment, the number of the LED light sources 122 and the number of the phosphor layers 210 are respectively greater than or equal to 2, and the number of the phosphor layers 210 is one more than that of the LED light sources 122, the phosphor layers 210 are closely arranged and located at the focal point of the curved mirror 310, the laser beam is projected onto the upper surface of the phosphor layer 210 located in the middle of the phosphor layers 210 to increase the illuminance of the light field center region 70, and the LED light sources 122 are not arranged under the phosphor layer 210, but are directly arranged on the substrate 121, so that the thermal resistance between the phosphor layer 210 and the substrate 121 can be reduced, and the heat dissipation speed of the phosphor layer 210 is promoted.

Example 4

Unlike embodiment 1, in this embodiment, the LED light source 122 and the fluorescent layer 210 are respectively provided with 2n+1, n is a natural number greater than or equal to 1, and they are in one-to-one correspondence, at this time, the reflecting unit 30 is formed by splicing a plurality of curved mirrors 310, each curved mirror 310 corresponds to a focal point, where the surface of the curved mirror 310 may be a paraboloid, an ellipsoid or other curved surface, each fluorescent layer 210 is located at the focal point of the corresponding curved mirror 310, where the number of fluorescent layers 210 may be the same as that of the curved mirrors 310, and they may be one-to-one or less than that of the curved mirrors 310, and the plurality of fluorescent layers 210 may be arranged along a straight line or other way, so that, of course, in order to improve the illumination uniformity, the pattern formed by arrangement is preferably an axisymmetric or a centrosymmetric pattern. The laser beam is projected onto the upper surface of the phosphor layer 210 located in the middle of the plurality of phosphor layers 210 to increase the illuminance of the central region 70 of the light field distribution. In this embodiment, since the plurality of phosphor layers 210 are arranged in a gap, and the laser beam is projected onto the central area of the wavelength conversion unit 20, an odd number of phosphor layers 210 are required, so that one phosphor layer 210 is located at the central position.

As shown in fig. 6-7, three LED light sources 122 and fluorescent layers 210 are respectively provided, and the reflection unit 30 is formed by splicing three curved mirrors 310, that is, a fluorescent layer 210 corresponds to a focal point of each curved mirror 310, and fluorescent light emitted by the corresponding fluorescent layer 210 is emitted in a parallel direction to form illumination light. In fig. 6, three phosphor layers 210 are arranged along a linear gap, where the second phosphor layer 210 is located in the central area of the wavelength conversion unit 20, so that the laser beam is projected to the central area (as shown in the black oval area in fig. 5) of the upper surface of the second phosphor layer 210 to excite the phosphor material in this area, so as to increase the illuminance of the light field central area 70, in this embodiment, the LED light sources 122 and the phosphor layers 210 are in one-to-one correspondence, that is, under each phosphor layer 210, one LED light source 122 is located on the substrate 121 through the reflective interface 123, and only one substrate 121 is provided with a plurality of electrodes on the substrate 121, so that power can be simultaneously supplied to each LED light source 122. The mounting manner between the fluorescent layer 210 and the LED light source 122 is the same as in embodiment 2.

Example 5

Unlike embodiment 4, in this embodiment, the LED light sources 122 and the fluorescent layers 210 are respectively provided with a plurality of, i.e., not less than 2, and the number of the fluorescent layers 210 is one more than that of the LED light sources 122, and the reflection unit 30 is formed by splicing a plurality of curved mirrors 310, each curved mirror 310 corresponds to a focal point, and each fluorescent layer 210 is located at the focal point corresponding to one curved mirror 310. The phosphor layers 210 may be arranged in a line or other manner with gaps therebetween, and it is preferable that the arrangement form a pattern having an axisymmetric or centrosymmetric pattern for improving the uniformity of illumination. The laser beam is projected onto the upper surface of the fluorescent layer 210 located in the middle of the fluorescent layers 210 to increase the illuminance of the light field central region 70, and the LED light source 122 is not disposed under the fluorescent layer 210 but directly disposed on the substrate 121, so that the thermal resistance between the fluorescent layer 210 and the substrate 121 can be reduced, and the heat dissipation speed of the fluorescent layer 210 is promoted.

Example 6

Unlike embodiments 1 to 5, in this embodiment, the included angle between the laser beam and the wavelength conversion unit 20 is 80 to 90 degrees, preferably 90 degrees, and even if the laser beam is projected onto the wavelength conversion unit 20 at 90 degrees, the energy concentration of the laser beam is improved, and the illuminance of the light field center region 70 is further improved.

When the reflecting unit 30 is the curved mirror 310, since the angle between the laser beam and the reflecting unit 30 is close to 90 degrees, and therefore, a certain angle exists between the reflecting unit and the horizontal direction, at this time, only the wavelength converting unit 20 needs to be rotated relative to the focal point of the curved mirror 310, so that the reflecting unit is perpendicular to the laser beam, in order to increase the utilization rate of the LED light source unit 12, the LED light source unit 12 and the wavelength converting unit 20 are rotated together, so that the relative positions of the two are kept unchanged, that is, the LED light source 122 is located directly under the corresponding fluorescent layer 210, at this time, in order to make full contact with the heat dissipation base 40, so as to ensure the heat dissipation effect, the shape of the substrate 121 can be adjusted, or a heat conduction member with a shape adapted is added under the substrate 121, and also the shape of the heat dissipation base 40 can be adaptively changed, as shown in fig. 8, which is a schematic diagram of one of modes.

Example 7

As shown in fig. 9, the present embodiment provides an illumination system, which includes the light emitting device, and the baffle 50 and the projection lens 60 located at the light outlet of the light emitting device, wherein the reflecting unit 30 has an ellipsoidal structure, which may be a rotational ellipsoidal structure or a deformed ellipsoidal structure, and the deformed ellipsoidal structure satisfies the following conditions: the cross-sectional curves obtained by cutting the curved surface of the deformed ellipsoid with a plane containing the central optical axis are all part of an elliptic curve, but the elliptic curves obtained by cutting with planes of different angles are not exactly the same, i.e. have no rotational symmetry. Wherein the wavelength converting element 20 is located at a focal point of the reflecting element 30 near the inner side, and the baffle 50 is located at a focal point of the reflecting element 30 near the outer side, where the inner and outer sides are opposite to the light exit, such that the light emitted from the wavelength converting element 20 is reflected by the reflecting element 30, and forms a substantially converging light spot at the baffle 50, which is projected by the projection lens 60 to form an image of the light spot in the far field, which is a typical projection type lamp structure. The baffle 50 functions to obtain a clear cutoff line by blocking part of the marginal rays when the light distribution of the low beam is generated. While in the formation of high beam illumination, the baffle 50 is moved away to allow the entire light to be projected out to create sufficient luminous flux and illuminance. In the illumination system of the present invention, when the illuminance of the central light field area 70 needs to be increased, the laser source 110 is turned on to excite the fluorescent layer at the central area of the wavelength conversion unit 20, so as to increase the brightness of the central light field area 70 to meet the requirement of high beam illumination, and when the illuminance of the central light field area 70 is sufficient, the laser source 110 is turned off to light only the LED light source 122. Thus, a compact high-low beam integrated headlamp light source system can be obtained. And by controlling the driving currents of the laser source 110 and the LED light source 122, the illumination of the central area 70 and the edge area of the light field can be accurately adjusted, and the purpose of energy saving can be realized on the basis of meeting the illumination standard.

In summary, the light emitting device and the lighting system provided by the invention have the following advantages compared with the prior art:

(1) By arranging the laser source unit 11 and the LED light source unit 12 in the excitation light unit, the laser beam emitted by the laser source unit 11 has the characteristics of good collimation and concentrated energy, and can form a point light source with ultra-high brightness, so that the central illuminance of a far light field is improved, and the requirement of the far light field is met; the light beam emitted by the LED light source unit 12 has large diffusion angle and meets the requirement of a near light field;

(2) The laser source unit 11 is turned on or turned off, so that free switching between a far light field and a near light field is realized, the operation is simple, and the use is convenient;

(3) The illumination of the central area 70 and the edge area of the light field can be accurately adjusted by matching the laser source unit 11 and the LED light source unit 12, so that the light distribution meeting the automobile high beam illumination standard can be obtained with minimum power, and the aim of saving energy is fulfilled while the illumination standard is met;

Although embodiments of the present invention have been described in the specification, these embodiments are presented only, and should not limit the scope of the present invention. Various omissions, substitutions and changes in the form of examples are intended in the scope of the invention.

Claims

1. A light emitting device, comprising: the laser device comprises an excitation light unit, a wavelength conversion unit (20) and a reflection unit (30), wherein the excitation light unit comprises a laser source unit (11) and an LED light source unit (12), the position of the wavelength conversion unit (20) corresponds to the focus of the reflection unit (30), a laser beam emitted by the laser source unit (11) and a light beam emitted by the LED light source unit (12) are respectively projected onto the wavelength conversion unit (20) and excite fluorescence, and the fluorescence is emitted according to a specified direction after being reflected by the reflection unit (30);

the laser source unit (11) and the wavelength conversion unit (20) are respectively arranged at two sides of the reflection unit (30), and a light transmission part (31) for transmitting the laser beam is arranged on the reflection unit (30);

the LED light source unit (12) comprises a substrate (121) and at least one LED light source (122), the wavelength conversion unit (20) comprises at least one fluorescent layer (210), the fluorescent layer (210) is arranged on the LED light source (122) or on the substrate (121), one fluorescent layer (210) corresponds to the upper part of each LED light source (122), and the lower part Fang Sheyu is arranged on the substrate (121); the reflection unit (30) is formed by splicing a plurality of curved mirrors (310), the wavelength conversion unit (20) is positioned at the focus of the curved mirrors (310), the laser beams are projected to the central area of the upper surface of the wavelength conversion unit (20), 2n+1 are respectively arranged on the LED light source (122) and the fluorescent layers (210), n is a natural number more than or equal to 1, the fluorescent layers (210) are distributed in a gap mode, the patterns formed by arranging the fluorescent layers (210) are axisymmetric or centrosymmetric patterns, and the laser beams are projected to the fluorescent layers (210) positioned among the fluorescent layers (210); each fluorescent layer (210) is positioned at the focus of a corresponding curved mirror (310), one fluorescent layer (210) is corresponding to each LED light source (122) above, and a reflecting interface (123) is arranged between the LED light source (122) and the substrate (121).

2. The light emitting device according to claim 1, wherein the position of the light passing portion (31) corresponds to the position of the laser beam, and an angle between the laser beam and the light passing portion (31) is 80-90 degrees.

3. A light emitting device according to claim 2, wherein the laser light source unit (11) comprises one or more laser light sources (110), the light passing portion (31) being provided with one or more.

4. The light emitting device according to claim 1, wherein the laser light source unit (11) further comprises one or a combination of two or more of a collimator unit, a beam angle changing unit (111), and a focusing unit (112), and the collimator unit, the beam angle changing unit (111), and the focusing unit (112) are disposed along the optical path.

5. A light emitting device according to claim 1, characterized in that a heat sink base (40) is further provided below the substrate (121).

6. A lighting system, comprising a light emitting device according to any one of claims 1-5, and a baffle (50) and a projection lens (60) at the light outlet of the light emitting device, wherein the reflecting unit (30) has an ellipsoidal structure, the wavelength converting unit (20) is located at the focus of the reflecting unit (30) near the inner side, and the baffle (50) is located at the focus of the reflecting unit (30) near the outer side.