CN111306512A

CN111306512A - Laser lighting lamp

Info

Publication number: CN111306512A
Application number: CN201910585126.2A
Authority: CN
Inventors: 张贤鹏
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd; YLX Inc
Priority date: 2018-12-11
Filing date: 2019-07-01
Publication date: 2020-06-19
Also published as: WO2020119354A1

Abstract

The invention discloses a laser lighting lamp, which comprises: the light source assembly is used for generating and outputting exciting light, the first reflecting piece and the wavelength conversion element are arranged in the light guide element, the first reflecting piece is used for reflecting the exciting light to the wavelength conversion element, the wavelength conversion element is used for converting the exciting light into excited light, the excited light is reflected to the light guide element, and the excited light is emitted after being shaped by the light guide element. Through setting up first reflector and wavelength conversion component in leaded light component's inside, can make on the one hand that the excitation light ability shines smoothly on wavelength conversion component and the excitation light ability shines smoothly to leaded light component on, on the other hand can make the structure of laser illumination lamps and lanterns compacter, and the volume is littleer, and the light collection efficiency is higher.

Description

Laser lighting lamp

Technical Field

The invention relates to the technical field of illumination, in particular to a laser illumination lamp.

Background

The laser has the advantages of high brightness, high coherence and the like, and the laser is adopted to excite the wavelength conversion element to obtain high-brightness white light, so that the laser can be used for military illumination or used as an automobile high beam.

The white light obtained by exciting the wavelength conversion element with the laser is lambertian, has a large divergence angle and a limited illumination distance, and the illumination light beam needs to have high directivity for realizing long-distance illumination and needs to be collected and collimated for obtaining the illumination light beam with high directivity, so that the divergence angle of the illumination light beam is small.

Since the laser has high brightness and high coherence, i.e. high power density, when the laser excites the wavelength conversion element, the wavelength conversion element generates a large amount of heat, and the wavelength conversion element needs to be subjected to heat dissipation treatment in order to maintain high luminous efficiency. In the existing laser fluorescence light source, a transmission scheme is generally adopted, namely, the radiation of laser and the emergence of fluorescence are respectively positioned on two side surfaces of a wavelength conversion element, so that the problem of difficult heat dissipation of the wavelength conversion element exists, and the low-power illumination requirement can only be met; if the power needs to be further increased, a reflection scheme is generally adopted, that is, the radiation of the laser and the emission of the fluorescence are located on the same side surface of the wavelength conversion element, and the other side surface of the wavelength conversion element is connected with the heat dissipation element for heat dissipation, but in the scheme, the light splitting element is adopted for splitting the laser and the fluorescence, so that the excitation light can be smoothly irradiated on the wavelength conversion element, and the fluorescence can be smoothly emitted, and the laser fluorescence light source has a large volume and a low light utilization rate.

Disclosure of Invention

The invention provides a laser lighting lamp to solve the technical problems of large volume and low light utilization rate of the laser lighting lamp in the prior art.

In order to solve the above technical problem, the present invention provides a laser lighting device, including: the light guide element comprises a light source assembly, a first reflecting piece, a wavelength conversion element, a second reflecting layer and a light guide element, wherein the light source assembly is used for generating exciting light, the first reflecting piece and the wavelength conversion element are arranged in the light guide element, the second reflecting layer is arranged on one side, far away from the light guide element, of the wavelength conversion element, the first reflecting piece is used for reflecting the exciting light to the wavelength conversion element, the wavelength conversion element is used for converting the exciting light into excited light, the second reflecting layer is used for reflecting the excited light to the light guide element, and the excited light is emitted after being shaped by the light guide element.

The invention has the beneficial effects that: different from the situation of the prior art, the first reflecting piece and the wavelength conversion element are arranged in the light guide element, so that on one hand, the excitation light emitted by the light source component can be smoothly irradiated to the wavelength conversion element, and the excitation light emitted by the wavelength conversion element can be smoothly incident on the light guide element, on the other hand, the laser lighting lamp is compact in structure and small in size, and meanwhile, the light utilization rate of the laser lighting lamp is high.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of a laser lighting fixture according to the present invention;

FIG. 2 is another schematic structural diagram of an embodiment of a laser lighting fixture according to the present invention;

FIG. 3 is another schematic diagram of an embodiment of a laser lighting fixture according to the present invention;

FIG. 4 is another schematic structural diagram of an embodiment of a laser lighting fixture according to the present invention;

FIG. 5 is a schematic top view of a laser lighting fixture according to an embodiment of the present invention;

FIG. 6 is a schematic top view of a laser lighting fixture according to an embodiment of the present invention;

FIG. 7 is a schematic top view of the heat dissipation device of the laser lighting fixture of FIG. 1;

FIG. 8 is another schematic diagram of an embodiment of a laser lighting fixture according to the present invention;

fig. 9 is another schematic structural diagram of an embodiment of a laser lighting fixture of the present invention.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a laser lighting fixture of the present invention.

The present invention provides a laser lighting lamp 100, the laser lighting lamp 100 includes a light source assembly 10, a first reflector 20, a wavelength conversion element 30, a second reflector 31, and a light guide element 40. The light source assembly 10 is configured to generate excitation light 11, the first reflecting component 20 is configured to reflect the excitation light 11 to the wavelength conversion element 30, the wavelength conversion element 30 is configured to convert the excitation light 11 irradiated thereon into stimulated light 12, the second reflecting layer 31 is configured to reflect the stimulated light 12 to the light guide element 40, and the light guide element 40 is configured to shape the stimulated light 12 and then emit the shaped stimulated light to form emergent light 13. Wherein the first reflector 20 and the wavelength converting element 30 are disposed inside the light guiding element 40.

In the invention, the first reflecting member 20 and the wavelength conversion element 30 are arranged inside the light guide element 40, so that on one hand, the exciting light 11 can be smoothly irradiated on the wavelength conversion element 30, and the laser beam 12 emitted by the wavelength conversion element 30 can be smoothly incident on the light guide element; on the other hand, the laser lighting fixture 100 has a compact structure, a small volume and high light collection efficiency.

In the present embodiment, the first reflective member 20 is used for reflecting the excitation light 11 emitted from the light source assembly 10 onto the wavelength conversion element 30, and the excitation wavelength conversion element 30 emits the received laser light 12. In order to ensure that the first reflecting member 20 can maximally reflect the excitation light 11 emitted from the light source assembly 10 so that as much as possible of the excitation light impinges on the wavelength converting element 30, the area of the first reflecting member 20 cannot be too small. Meanwhile, since the first reflecting member 20 is also located on the light emitting path of the received laser light 12, the received laser light 12 irradiated onto the first reflecting member 20 out of the received laser light 12 emitted from the wavelength conversion element 30 is reflected by the first reflecting member 20 and cannot be emitted to the outside, and in order to minimize the reflected received laser light 12, the area of the first reflecting member 20 must be designed to be as small as possible. In this embodiment, the size of the first reflective element 20 needs to be set to simultaneously take into account the utilization rate of the excitation light 11 and the stimulated light 12.

As shown in fig. 1, in the present embodiment, the light source assembly 10 includes a laser light source 14 and an optical element group 15, the laser light source 14 is used for generating excitation light 11, and the optical element group 15 is disposed on a light path between the laser light source 14 and the first reflector 20 and is used for collecting and converging the excitation light 11 emitted from the laser light source 14, so as to reduce the size of a light spot of the excitation light 11 irradiated onto the first reflector 20, and further reduce the area of the first reflector 20 to the maximum extent, thereby reducing the shielding of the first reflector 20 by the laser light 12, reducing the loss of the emitted light 13, and improving the brightness of the emitted light 13.

In the present embodiment, the laser light source 14 is a semiconductor light source, preferably a laser diode, which emits the excitation light 11 of blue color. The optical element group is a condensing lens 15, and the condensing lens 15 is a convex lens.

In another embodiment, the number of light source modules 10 can be increased to further increase the brightness of the light emitted from the laser lighting fixture. Referring to fig. 2, the laser lighting fixture 10 includes at least two light source assemblies 10, and at least two first reflectors 20 are correspondingly disposed, so that the excitation light emitted from the at least two light source assemblies 10 can be smoothly reflected to the wavelength conversion element 30 for exciting the wavelength conversion element 30 to emit the excited light.

In another embodiment, referring to fig. 3, in the present embodiment, the light source assembly 10 includes at least two laser light sources 14 and at least two first optical element groups 15a, wherein the laser light sources 14 and the first optical element groups 15a are disposed in a one-to-one correspondence manner. The laser light source 14 is used for generating the excitation light 11, and the first optical element group 15a is used for collecting, collimating, deflecting and converging the excitation light 11 emitted by the laser light source 14.

Specifically, as shown in fig. 3, the first optical element group 15a includes a collimator lens 16, two third reflectors 17, and a condensing lens 15. Each collimating lens 16 is disposed corresponding to each laser light source 14, and is used for collecting and collimating the excitation light 11 into parallel light. The two third reflectors 17 are used for deflecting and translating the optical path of the parallel light collimated by each collimator lens 16, and the converging lens 15 is used for converging the excitation light 11 deflected by the third reflector 17, so as to further reduce the size of the light spot of the excitation light 11 irradiated onto the first reflector 20. With the above arrangement, the arrangement interval between the laser light sources 14 can be increased, which is beneficial to heat dissipation of the laser light sources 14.

In another embodiment, referring to fig. 4, in the present embodiment, the light source assembly 10 includes at least two laser light sources 14 and a second optical element group 15b, wherein the laser light sources 14 are used for generating the excitation light 11, and the second optical element group 15b is used for collecting, collimating, compressing and converging the excitation light 11 emitted from the laser light sources 14.

Specifically, as shown in fig. 4, the second optical element group 15b includes at least two collimating lenses 16, a positive and negative lens group 18, and a condensing lens 15, wherein each collimating lens 16 is disposed corresponding to each laser light source 14 for collecting and collimating the excitation light 11 into parallel light. The positive and negative lens groups 18 are used to compress the collimated parallel light of each collimating lens 16 so that the distance between the parallel excitation light rays 11 is smaller. The condensing lens 15 is used to condense the excitation light 11 deflected by the positive and negative lens groups 18, and further reduce the size of the spot of the excitation light 11 irradiated onto the first reflecting member 20. With the above arrangement, the arrangement interval between the laser light sources 14 can be increased, which is beneficial to heat dissipation of the laser light sources 14.

Among them, in the embodiments shown in fig. 3 and 4, the number of the condensing lenses 15 may be one or more. For example, one corresponding condensing lens 15 may be provided for each laser light source 14, or only one condensing lens 15 may be provided, the number of condensing lenses 15 corresponding to the number of first reflecting members 20, because one condensing lens is used to condense a parallel beam of excitation light. The number of the condensing lenses 15 is not particularly limited in the present invention.

By arranging at least two laser light sources 14, on one hand, the power of exciting light can be increased, and further, the brightness of the laser lighting lamp 100 is increased; on the other hand, the power of each laser source 14 can be reduced, so as to prolong the service life of the laser source 14, and simultaneously keep the excitation power of the light source assembly 10 higher.

Further, the plurality of laser light sources 14 may be uniformly distributed in the circumferential direction of the wavelength converting element 30 to make the light intensity of the outgoing light 13 uniform.

In this embodiment, the first reflecting member 20 may be a plane mirror. And the number of the first reflecting members 20 can be flexibly selected according to the number of the condensing lenses 15, for example, in the embodiment shown in fig. 1, one first reflecting member 20 is provided corresponding to one condensing lens 15. In the embodiment shown in fig. 2, two laser light sources 14, two converging lenses 15 and two first reflecting members 20 are included, and the first reflecting members 20 are disposed in one-to-one correspondence with the converging lenses 15.

As shown in fig. 1, in the present embodiment, the first reflecting member 20 is disposed in a region close to the second incident surface 441, and the area of the first reflecting member 20 is set to a size that simultaneously considers the utilization rate of the excitation light 11 and the loss rate of the stimulated light 12. The method for fixing the first reflecting member 20 on the region close to the second incident surface 441 may refer to the prior art, for example, the first reflecting member 20 may be fixed by gluing or by providing a fixing bracket, and the application is not limited thereto.

In another embodiment, as shown in fig. 9, the first reflecting member 20 can be further implemented by plating or coating a reflective film layer on a partial region of the second incident surface 441, and since the second incident surface 441 is a spherical surface, the first reflecting member 20 formed in the above manner is a curved mirror. By forming the curved surface reflector as the first reflector 20 on the partial region of the second incident surface 441, the number of components can be reduced, and the installation complexity can also be reduced, and since the first reflector is a curved surface reflector which has both reflecting and converging functions, the laser spot irradiated onto the wavelength conversion element 30 after being reflected by the first reflector can be smaller, so that the area of the wavelength conversion element 30 can be further reduced, and the volume of the laser lighting fixture 100 can be reduced.

The first reflecting part 20 is arranged to realize the folding of the laser light path, so that the direction of the exciting light 11 emitted by the laser light source 14 is the same as the direction of the emergent light 13 of the laser lighting lamp 100, the size of the laser light source lamp 100 is reduced, and the radiation surface of the exciting light 11 and the emergent surface of the excited light 12 are positioned on the same side of the wavelength conversion element 30, which is beneficial to arranging a heat radiation structure on the wavelength conversion element 30.

In the present embodiment, the wavelength converting element 30 is a reflective wavelength converting element formed by providing a second reflective layer 31 on a side of the wavelength converting element 30 remote from the light guiding element 40. The wavelength converting element 30 comprises a substrate, which may be transparent silica gel, glass or ceramic, and luminescent centers, which may contain phosphors or quantum dots or other luminescent materials. Specifically, the light emitting center is YAG phosphor, which absorbs blue light emitted from the laser light source 14 and emits yellow fluorescent light. Wherein, the blue light which is not converted by the wavelength conversion element 30 is mixed with the yellow fluorescence emitted by the wavelength conversion element 30 to form the white stimulated light 12; the second reflective layer 31 may be a diffuse reflective layer or a metal reflective layer, wherein the diffuse reflective layer may be made of TiO₂、MgO、BaSO₄The metal reflecting layer can be an aluminum layer or a silver layer, and the like, and can be coated or sprayedCoating, and the like.

In another embodiment, the wavelength conversion element is prepared from red and green phosphors and a substrate. When the blue excitation light 11 is irradiated to the wavelength conversion element 30, the wavelength conversion element 30 converts a part of the blue light into red-green light, and mixes the converted red-green light and the unconverted blue light to form white stimulated light 12.

In the present embodiment, by providing the reflective wavelength conversion element 30, that is, the radiation surface of the excitation light 11 and the emission surface of the stimulated light 12 are located on the same side of the wavelength conversion element 30, the other side of the wavelength conversion element 30 can be connected to a scattering device for dissipating heat from the wavelength conversion element 30, so as to prolong the service life of the wavelength conversion element 30 and improve the brightness of the stimulated light 12.

In the embodiment, the wavelength conversion element 30 is a regular polygon, the side length of the regular polygon is 0.2-2mm, and the maximum size of the light guide element 40 is 20-40mm, so as to reduce the volume of the laser lighting fixture 100. In other embodiments, the wavelength conversion element 30 may also be circular, etc., and the thickness of the wavelength conversion element 30 is 200nm to 1000nm in order to enhance the heat dissipation of the wavelength converter element 30.

In the present embodiment, the light guide element 40 is used to collect and shape the received laser light 12 and emit the received laser light. As shown in fig. 1, the light guiding element 40 is a total internal reflection lens having an exit surface 41 and an entrance surface 42 disposed opposite to each other and a reflection surface 43 connecting the exit surface 41 and the entrance surface 42. The received laser beam 12 enters the light guide element 40 through the incident surface 42 and exits through the exit surface 41.

The emission surface 41 and the incident surface 42 are transmission surfaces, and the reflection surface 43 is a total internal reflection surface. The transmission surface is a surface that allows the excitation light 12 to pass through, and the excitation light 11 is refracted when passing through the transmission surface. The stimulated light 12 undergoes total internal reflection when it strikes the reflective surface.

In the present embodiment, the incident surface 42 includes a first incident surface 442 and a second incident surface 441, and the second incident surface 441 is connected to the first incident surface 442 and disposed around the first incident surface 442. Specifically, as shown in fig. 1, the second incident surface 441 is preferably configured as a hemispherical surface, and in other application scenarios, the second incident surface may also be configured as a conical surface, and the first incident surface 442 is disposed in the middle of the second incident surface 441. The first incident surface 442 and the second incident surface 441 are rotationally symmetric about a rotation axis I-I, the wavelength conversion element 30 is disposed on the rotation axis I-I, among the received laser light 12 emitted by the wavelength conversion element 30, the received laser light 12 with a small angle enters the light guide element 40 through the first incident surface 442 and is transmitted by the light guide element 40 to be emitted, and the received laser light 12 with a large angle enters the light guide element 40 through the second incident surface 441 and is reflected by the reflection surface 43 of the light guide element 40 to be emitted after being totally internally reflected.

In the present embodiment, the reflection surface 43 is also a rotational symmetry surface, and the rotational symmetry axis of the reflection surface 43 coincides with the rotational symmetry axis of the incidence surface 42, that is, the rotational symmetry axis of the reflection surface is also the I-I axis shown in fig. 1. As shown in fig. 1, the reflecting surface 43 is a continuous curved surface that is rotationally symmetric. In another embodiment, the reflective surface 43 may be formed by splicing a plurality of sub-planes. Wherein the plurality of sub-planes are rotationally symmetrically distributed with their rotational symmetry axes coinciding with the rotational symmetry axis of the entrance face 42.

In this embodiment, the exit surface 41 of the tir lens 40 may be curved and/or planar. The illumination light 13 emitted from the emission surface 41 of the light guide element 40 has a small divergence angle and high collimation characteristics, thereby increasing the luminance and the irradiation distance of the illumination light 13.

In the embodiment shown in fig. 1, the exit face 41 of the tir lens is composed of a flat surface and a curved surface. Specifically, the exit surface 41 includes a first exit surface 412 and a second exit surface 411. The first emitting surface 412 is connected to the second emitting surface 411 and disposed around the first emitting surface 412, the second emitting surface 411 is a plane with a certain inclination angle, the first emitting surface 412 is a rotationally symmetric curved surface, and the rotational symmetry axis thereof coincides with the rotational symmetry axis of the incident surface 42, wherein the received laser beam 12 entering the light guide element from the first incident surface 442 exits from the first emitting surface 412, and the received laser beam 12 entering the light guide element 40 from the second incident surface 441 exits from the second emitting surface. With the above arrangement, the illumination light 13 emitted through the light guide element 40 can be made to have a smaller divergence angle and a higher collimation characteristic.

In another embodiment, as shown in FIG. 2, the exit surface 41 of the TIR lens 40 is planar, which is simple and costly to manufacture. Of course, in another embodiment, the exit surface 41 of the tir lens may also be a curved surface, which may be a convex surface or a concave surface, and the curved surface is also a rotational symmetric surface, and the rotation axis of the rotational symmetric surface coincides with the rotational symmetric axis of the incident surface 42, according to the requirement of the divergence angle of the emitted illumination light 13.

In the embodiment shown in fig. 1, the working principle of the laser lighting lamp 100 is as follows: the excitation light 11 emitted by the laser light source 14 is converged by the converging lens 15 and then irradiated on the first reflecting member 20, the first reflecting member 20 reflects the incident excitation light 11 onto the wavelength conversion element 30, the wavelength conversion element 30 converts the excitation light 11 into the stimulated light 12, and the second reflecting layer 31 reflects the stimulated light 12 into the light guide element 40. If the emission angle of the received laser light 12 emitted by the wavelength conversion element 40 is small, the received laser light enters the light guide element 40 from the first incident surface 442, is refracted by the first incident surface 442, and is emitted from the first emitting surface 412 of the light guide element 40; if the emission angle of the received laser light 12 emitted from the wavelength conversion element 30 is large, the received laser light enters the light guide element 40 from the second incident surface 441, is refracted by the second incident surface 441 and then is irradiated to the reflection surface 43 of the light guide element 40, and is then emitted through the second exit surface 411 of the light guide element 40 after being totally internally reflected by the reflection surface 43, so that the emission angle of the illumination light 13 emitted from the light guide element 40 is small, and the collimation characteristic of the light beam is high.

In another embodiment, as shown in fig. 4, the light guide element 40 may further include a light reflecting cup 45 and an optical lens 46 disposed within the light reflecting cup.

Specifically, the light guiding element 40 includes a light reflecting cup 45, and the optical lens 46, the first reflector 20, and the wavelength converting element 30 are disposed within the light reflecting cup 45. The reflective cup 45 includes a reflective surface 43, and the reflective surface 43 is a rotationally symmetric curved surface, and the rotational symmetry axis thereof is the axis II-II shown in fig. 3. The optical lens 46 and the center of the wavelength conversion element 30 are disposed on the symmetry axis II-II, the first reflection member 20 is disposed on two sides above the wavelength conversion element 30 to reflect the excitation light 11 onto the wavelength conversion element 30 to excite the wavelength conversion element 30 to emit the stimulated light 12, and to reduce the shielding of the first reflection member 20 on the stimulated light 12, wherein the reflection surface 43 of the reflective cup 45 is a smooth continuous curved surface. In another embodiment, as shown in fig. 5, the reflecting surface 43 may be formed by splicing a plurality of sub-planes. Wherein the plurality of sub-planes are rotationally symmetrically distributed; the optical lens 46 is a convex lens whose optical axis coincides with the axis of symmetry II-II.

In the present embodiment, the optical lens 46 is fixed to the reflecting surface 43 of the reflector cup 45. Specifically, as shown in fig. 4, in the present embodiment, the optical lens 46 is fixed to the reflector cup 45 by a thin strip-shaped lens holder arm 47. Of course, in other embodiments, the optical lens 46 may also be installed and fixed by the net-shaped or radial lens holder arms 47, and the embodiment of the present application does not specifically limit the fixing manner of the optical lens 46.

As shown in fig. 6, the optical lens 46 may also be secured to a heat sink 50. Specifically, at least two strip-shaped lens holder arms 47 are provided on the heat sink 50 so as to protrude therefrom and are connected to the optical lens 46. For example, in the present embodiment, three lens holder arms 47 are provided to protrude from the heat sink 50, so that the optical lens 46 is more stably fixed.

In the embodiment shown in fig. 4, the working principle of the laser lighting lamp 100 is as follows: the excitation light 11 emitted by the laser light source 14 is converged by the second optical element group 15b and then irradiated on the first reflecting member 20, the first reflecting member 20 reflects the excitation light 11 onto the wavelength conversion element 30, the wavelength conversion element 30 converts the excitation light 11 into the stimulated light 12, and the second reflecting layer 31 reflects the stimulated light 12 to the light guide element 40. The light receiving laser beam 12 having a small emission angle is irradiated onto the optical lens 46, and is shaped by the optical lens 46 to be emitted as the illumination light 13. The reflected light beam 12 having a large emission angle is irradiated onto the reflection surface 43 of the reflector 45, and the reflection surface 43 reflects the reflected light beam 12 and emits the reflected light beam from the opening at the top of the reflector 45 to form the illumination light 13. With the above arrangement, the divergence angle of the illumination light 13 can be made small, and the collimation characteristic of the light beam is high.

Further, as shown in fig. 1, the laser lighting device 100 further includes a heat sink 50, and the wavelength conversion element 30 and the light guide element 40 are disposed on one side of the heat sink 50, so that the heat sink 50 can dissipate heat for the wavelength conversion element 30 and the light guide element 40, and the heat dissipation of the wavelength conversion element 30 and the light guide element 40 can be enhanced, thereby improving the service life of the wavelength conversion element 30 and the light guide element 40.

The light source assembly 10 is disposed on the other side of the heat sink 50 away from the light guide element 40, the first reflector 20 and the wavelength conversion element 30, and the heat sink 50 is further provided with a light hole 51 so that the excitation light 11 can irradiate the first reflector 20 through the heat sink 50.

Specifically, as shown in fig. 1, the heat sink 50 is disposed between the laser light source 14 and the first reflecting member 20, and the condensing lens 15 is disposed between the laser light source 14 and the heat sink 50. The excitation light 11 emitted from the laser light source 14 is converged by the converging lens 15, and then passes through the light-transmitting hole 51 to be irradiated onto the first reflecting member 20.

The number of the light holes 51 on the heat dissipation device 50 is equal to the number of the focusing lenses 15, and the light holes are arranged corresponding to each focusing lens 15. Similarly, the number of the first reflectors 20 is equal to the number of the condensing lenses 15, and the first reflectors 20 are disposed in one-to-one correspondence with the light-transmitting holes 51.

In the present embodiment, as shown in fig. 7, 4 light holes 51 are formed on the heat sink 50, and the 4 light holes 51 are rotationally symmetrically distributed on the heat sink 50. The wavelength converting element 30 is disposed at the center of the 4 light transmitting holes 51.

In another embodiment, as shown in fig. 2, a light-transmitting material may be filled in the light-transmitting hole 51, or a heat dissipation device 50 having a light-transmitting region may be used. Through filling the light-transmitting material in the light-transmitting hole 51 or forming the light-transmitting area on the heat dissipation device 50, not only the exciting light 11 can be transmitted, but also the sealing performance of the laser lighting fixture 100 can be improved, and external impurities are prevented from entering the light guide element 40 through the light-transmitting hole 51.

In yet another embodiment, as shown in fig. 8, a converging lens 15 may also be disposed in the light-transmissive hole 51. Specifically, the size of the condenser lens 15 is the same as that of the light transmission hole 51, and the condenser lens 15 is fixed to a side wall of the light transmission hole 51. By disposing the condensing lens 15 in the light transmitting hole 51, the laser lighting fixture 100 can be made more compact and smaller.

In summary, in the present invention, the first reflective member 20 and the wavelength conversion element 30 are disposed inside the light guide element 40, so that the excitation light 11 emitted from the light source assembly 10 can smoothly irradiate the wavelength conversion element 30, and the received laser light 12 emitted from the wavelength conversion element 30 can smoothly enter the light guide element 40, and is collected and shaped by the light guide element 40 to form the illumination light 13, on the other hand, the structure of the laser lighting fixture is compact, the volume is small, and the light utilization rate of the laser lighting fixture is high.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A laser lighting fixture, said laser lighting fixture comprising: the light guide element comprises a light source assembly, a first reflecting piece, a wavelength conversion element, a second reflecting layer and a light guide element, wherein the light source assembly is used for generating exciting light, the first reflecting piece and the wavelength conversion element are arranged in the light guide element, the second reflecting layer is arranged on one side, far away from the light guide element, of the wavelength conversion element, the first reflecting piece is used for reflecting the exciting light to the wavelength conversion element, the wavelength conversion element is used for converting the exciting light into stimulated light, the second reflecting layer is used for reflecting the stimulated light to the light guide element, and the stimulated light is emitted after being shaped by the light guide element.

2. The laser lighting fixture of claim 1, wherein the light guide element is a total internal reflection lens having oppositely disposed entrance and exit faces and a reflective face connecting the entrance and exit faces; the incident plane comprises a first incident plane and a second incident plane, the second incident plane is connected with the first incident plane and surrounds the first incident plane, and the first reflecting piece is arranged at the second incident plane.

3. The laser lighting device according to claim 2, wherein the first reflecting member is a plane mirror disposed in a region close to the second incident surface.

4. The laser lighting device according to claim 2, wherein the first reflecting member is provided in a partial region on the second incident surface, and the first reflecting member is a curved reflecting mirror.

5. The laser lighting fixture according to claim 2, wherein the exit surface of the light guide element is planar and/or curved.

6. The laser lighting fixture of claim 1 wherein the light guide element comprises a reflective cup and an optical lens disposed within the reflective cup, the reflective cup including a reflective surface, the first reflector and the wavelength conversion element being located within the reflective cup.

7. The laser lighting device according to claim 2 or 6, wherein the reflecting surface of the light guide element is a continuous curved surface with rotational symmetry or the reflecting surface of the light guide element is formed by splicing a plurality of sub-planes with rotational symmetry.

8. The laser lighting fixture of claim 1 wherein the light source assembly includes at least one laser light source and at least one optical element set disposed in the optical path between the laser light source and the first reflector, the optical element set including at least one of a converging lens, a collimating lens, a third reflector, or a positive and negative lens set.

9. The laser lighting fixture of claim 1, further comprising a heat sink, wherein the wavelength conversion element and the light guide element are disposed on the heat sink, the heat sink is formed with a light hole, and the excitation light irradiates the first reflector through the light hole.

10. The laser lighting fixture of claim 9 wherein the light source assembly includes at least one laser light source and at least one optical element set positionable within the light bore.