CN110778973A

CN110778973A - Lighting device

Info

Publication number: CN110778973A
Application number: CN201910556082.0A
Authority: CN
Inventors: 张贤鹏; 李屹; 张红秀
Original assignee: Shenzhen Yili Ruiguang Technology Development Co Ltd
Current assignee: Shenzhen Yili Ruiguang Technology Development Co Ltd; YLX Inc
Priority date: 2018-07-26
Filing date: 2019-06-25
Publication date: 2020-02-11
Also published as: WO2020019714A1

Abstract

The application discloses a lighting device, which comprises a light source, a luminous body and a first protection element, wherein the light source is used for emitting laser; the luminous body is used for receiving the laser emitted by the light source and performing wavelength conversion to form illumination light, the luminous body comprises a light inlet end and a bottom end opposite to the light inlet end, and a light outlet surface of the luminous body is arranged on the side surface between the light inlet end and the bottom end; the first protection element covers and is arranged on the outer surface of the bottom end of the luminous body and used for preventing the light of the luminous body from being emitted from the bottom end. Through above-mentioned lighting device, can prevent that laser from directly emiting, improved the security, improved the heat dissipation.

Description

Lighting device

Technical Field

The application relates to the technical field of lighting, in particular to a lighting device.

Background

A vehicle lamp is an indispensable functional component of a motor vehicle, and is a main mode of vehicle lighting. Especially, the headlamp is an important guarantee for ensuring the driving safety of the vehicle, and the brightness and the illumination distribution of the headlamp form strict industrial standards and specifications. The traditional modern automobile lamp is subject to the evolution of light sources such as incandescent lamps, halogen lamps, xenon lamps and the like, and forms a mature lamp design, manufacture and brightness distribution implementation scheme. With the application of new energy technology in automobiles and the enhancement of environmental awareness of people, the requirements of reducing the power consumption of automobile lamps and realizing safer automobile lamp illumination are increasingly highlighted, and the development of the automobile headlamp technology based on the LED and the laser light source is also promoted. Although LED technology has been advanced, since the vehicle lamp needs to be applied in a high heat environment, the LED technology is difficult to realize a small-area and high-luminous-flux vehicle lamp light source, and the conventional vehicle lamp optical system cannot be directly applied to the LED light source particularly in the application of the headlamp. LED headlamps are therefore typically provided with multiple light sources, multiple lamp modes to meet the needs of use. Because the LED has larger difference with the traditional halogen lamp and tungsten lamp bulb, in the aspect of rear-mounted LED lamp wires, even though the improvement is larger in recent years, the phenomenon that the illumination range of the LED lamp is not in accordance due to mismatching of the traditional reflecting cup still exists.

Compared with the prior art, the laser light source has high light intensity in unit area, combines the wavelength conversion fluorescent powder technology, has the application potential of being easier to realize light type control and high-efficiency illumination distribution, and has application attempts in the field of car lamps, particularly in the field of high beam illumination. However, the existing laser light source has the defects of direct vision hazard of human eyes, high protection requirement, brand new design of a system, integral replacement of the car lamp and the like, is expensive, is difficult to replace, and can hardly meet the requirement of replacing the traditional car light source particularly in the after-assembly market.

Disclosure of Invention

For the laser security problem of solving current laser fluorescence car light, this application separates light source and luminous body, provides a lighting device that security performance is high, includes: a light source for emitting laser light; the luminous body is used for receiving the laser emitted by the light source and performing wavelength conversion to form illumination light, the luminous body comprises a light inlet end and a bottom end opposite to the light inlet end, and a light outlet surface of the luminous body is arranged on the side surface between the light inlet end and the bottom end; the first protection element covers and is arranged on the outer surface of the bottom end of the luminous body and used for preventing the light of the luminous body from being emitted from the bottom end.

The beneficial effect of this application is: separating the light source emitting laser from the luminous body to isolate the two heat sources; the light-emitting surface of the luminous body is arranged on the side surface between the incident end and the bottom end which are opposite to each other, and the first protection element for preventing light from being emitted is arranged at the bottom end, so that laser is bound to pass through a turning process before being emitted by the luminous body, the possibility of direct leakage and emission of the laser is eliminated, and the safety of a light source is improved.

In one embodiment, a surface of the first protection element in contact with the light emitter is a reflective surface, or a surface of the light emitter in contact with the first protection element is a reflective surface, or a reflective material is filled between the first protection element and the contact surface of the light emitter.

In one embodiment, the bottom end of the light emitter is provided with a scattering structure. According to the technical scheme, the light distribution of the laser incident to the bottom of the luminous body is changed, the light beam is not concentrated in a small-angle range any more, and the problem of visual safety caused by strong light emergence is avoided.

In one embodiment, the first protection element comprises a heat dissipation structure. According to the technical scheme, the heat radiation structure is arranged on one side, away from the light inlet end, of the luminous body, so that the heat generated by the luminous body can be radiated to one side, away from the light inlet end and away from the laser light source, the bidirectional heat conduction is realized, the heat accumulation between the luminous body and the laser light source is avoided, the uniformity of the temperature distribution of the luminous body is improved, and the service life of the luminous body is prolonged.

In one embodiment, the light emitter includes a light guide body and a wavelength conversion layer, the wavelength conversion layer is disposed at the light exit surface, and the laser enters the light guide body from the light entrance end and exits from the light exit surface after passing through the wavelength conversion layer.

In one embodiment, the wavelength conversion layer is a fluorescent silica gel, a fluorescent glass, a fluorescent ceramic, or a quantum dot film.

In one embodiment, a surface of the light guide in contact with the wavelength conversion layer is provided with microstructures. The technical scheme improves the passing rate of light entering the wavelength conversion layer from the light guide body.

In one embodiment, the light incident end is provided with a selective light-transmitting film for transmitting the laser light with small angle incidence and reflecting other light. According to the technical scheme, the large-angle laser and the illuminating light in the light guide body cannot fall back to the laser light source through the light inlet end, so that the light utilization rate is improved.

In one embodiment, the light emitter is a fluorescence light guide, and the laser enters the fluorescence light guide from the light entrance end, undergoes wavelength conversion by the fluorescence light guide, and then exits from the light exit surface.

In one embodiment, the light-emitting surface of the light-emitting body is provided with a highly refractive medium and/or microstructure.

In one embodiment, the bottom end surface of the light emitter is a cambered surface.

In one embodiment, the lighting device further includes a light conduction assembly, and the light conduction assembly is disposed between the light source and the light emitter and is used for conducting laser light emitted by the light source to a light inlet end of the light emitter.

In one embodiment, the light conducting component comprises one or more of an optical lens, an optical fiber.

In one embodiment, the lighting device further includes a heat conducting element and a heat dissipating base, two ends of the heat conducting element are respectively and fixedly connected to the heat dissipating base and the light emitting body, the heat conducting element and the heat dissipating base form an accommodating cavity, and the light source and the light conducting assembly are disposed in the accommodating cavity.

In one embodiment, the connection surface of the heat conducting element and the light emitter and the inner wall of the accommodating cavity are reflecting surfaces.

In one embodiment, the lighting device further includes a second protection element disposed on an optical path of the illumination light of the light emitter and having high light transmittance, and two ends of the second protection element are respectively connected to the first protection element and the heat conduction element.

In one embodiment, a heat conducting material is filled between the heat conducting element and the heat dissipation base, and/or between the heat conducting element and the light emitter, and/or between the light emitter and the first protection element.

Drawings

FIG. 1 is a schematic structural view of a first embodiment of the lighting device of the present application;

FIG. 2 is a schematic structural diagram of an embodiment of a light emitter according to the present application;

FIG. 3 is a schematic structural view of a second embodiment of the lighting device of the present application;

FIG. 4 is a schematic structural view of a third embodiment of the lighting device of the present application;

FIG. 5 is a schematic structural diagram of a further embodiment of a light emitter according to the present application;

FIG. 6 is a schematic structural view of a fourth embodiment of the lighting device of the present application;

FIG. 7 is a schematic structural diagram of a further embodiment of a light emitter according to the present application;

FIG. 8 is a schematic structural view of a fifth embodiment of the lighting device of the present application;

fig. 9 is a schematic structural view of a sixth embodiment of the lighting device of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Please refer to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a lighting device according to the present application. The lighting device 10 improved in the present embodiment includes: the laser lamp comprises a light source 11 for emitting laser, a light conduction component 12 for conducting and converging the laser emitted by the light source 11, a luminous body 13 for receiving the light conducted by the light conduction component 12, a first protection element 14 arranged on the luminous body 13 and used for protecting the luminous body 13, a heat conduction element 15 arranged around the light source 11 and the light conduction component 12, and a heat dissipation base 16 arranged in a manner of being attached to one end of the heat conduction element 15, wherein the heat conduction element 15 and the heat dissipation base 16 form an accommodating cavity.

The light source 11 is disposed in the accommodating cavity, specifically on the heat dissipation base, specifically a laser, and may be one or more lasers, which is not limited herein, but in this embodiment, one laser is used.

The light conducting component 12 is also disposed in the accommodating cavity, and is configured to converge the laser light emitted by the light source 11 into a laser light cone, and inject the converged laser light cone into the light emitting body 13, optionally, the light conducting component 12 may be one or more of a single lens, a positive and negative lens group, an optical fiber, an optical waveguide, and a reflector, and in this embodiment, the light conducting component 12 employs a single lens.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of the light emitter 13. The light emitter 13 includes: the light guide 131, the wavelength conversion layer 132 surrounding the light emitting surface of the light guide 131, the selective light transmission film 133 disposed at the light incident end of the light guide 131, the microstructures 134 disposed between the light guide 131 and the wavelength conversion layer 132, and the scattering particles 135 disposed at the bottom end of the light guide 131 far from the light incident end.

The light guide 131 is used for conducting laser light, and may be made of one of glass and alumina transparent ceramic, and the shape of the light guide includes one of a cylinder, a quadrangular prism, a triangular prism, a hexagonal prism and an octagonal prism, the outer side of the light incident end of the light guide 131 is surrounded and fixed by the heat conducting element 15, and meanwhile, the bottom end of the light guide 131 far away from the light incident end is surrounded and fixed by the first protection element 14.

The laser light enters the light guide 131 from the light incident end, passes through the wavelength conversion layer 132, and exits from the light exit surface. The wavelength conversion layer 132 is mounted on the outer surface of the light guide 131 at the middle position to form a light emitting layer, the mounting method may be one of sintering, bonding, coating and adhering methods, and both ends of the wavelength conversion layer are in seamless contact with the first protective element 14 and the heat conducting element 15 respectively, for converting the laser light conducted in the light guide 131 into white light, the wavelength conversion layer 132 is made of fluorescent silica gel, fluorescent glass, fluorescent ceramic or quantum dot film, when the laser light conducted in the light guide 131 passes through the wavelength conversion layer 132, the wavelength of the laser light is converted into white light, and the white light is emitted as illumination light.

In the present application, the fluorescent silica gel is an organic phosphor layer bonded by silica gel/resin, and the fluorescent glass is an inorganic phosphor layer bonded with phosphor powder after being softened by glass powder. The silica gel, the resin and the glass powder act as a binder.

In the present invention, the fluorescent ceramic may be, for example, a pure phase fluorescent ceramic or a complex phase fluorescent ceramic. The pure-phase fluorescent ceramic can be various oxide ceramics, nitride ceramics or oxynitride ceramics, and a luminescent center is formed by doping a trace of activator elements (such as lanthanide) in the preparation process of the ceramic. Because the doping amount of the activator element is generally small (generally less than 1%), the fluorescent ceramic is generally transparent or semitransparent luminescent ceramic.

Generally, the pure-phase fluorescent ceramic is of a polycrystalline structure, the wavelength conversion layer can also be a fluorescent single crystal, and the fluorescent single crystal has better light transmission performance, is generally colored and transparent and has high thermal conductivity.

The complex phase fluorescent ceramic takes transparent/semitransparent ceramic as a matrix, and fluorescent ceramic particles (such as fluorescent powder particles) are distributed in the ceramic matrix. The transparent/translucent ceramic matrix can be a variety of oxide ceramics (e.g., alumina ceramics, Y) ₃Al ₅O ₁₂Ceramics), nitride ceramics (such as aluminum nitride ceramics) or oxynitride ceramics, the ceramic matrix is used for conducting light and heat, so that exciting light can be incident on the fluorescent ceramic particles, and excited light can be emitted from the complex phase fluorescent ceramics; the fluorescent ceramic particles assume the main light emitting function of the fluorescent ceramic for absorbing the excitation light and converting it into stimulated light. The grain size of the fluorescent ceramic particles is larger, and the doping amount of the activator element is larger (such as 1-5%), so that the luminous efficiency is high; and the fluorescent ceramic particles are dispersed in the ceramic substrate, so that the condition that the fluorescent ceramic particles positioned at the deeper position of the fluorescent ceramic cannot be irradiated by exciting light is avoided, and the condition that the concentration of an activator element is poisoned due to the large integral doping amount of the pure-phase fluorescent ceramic is also avoided, thereby improving the luminous efficiency of the fluorescent ceramic.

In an embodiment of the present invention, scattering particles may be further added to each wavelength conversion layer, so that the scattering particles are distributed in the wavelength conversion layer. The scattering particles are used for enhancing the scattering of the exciting light in the luminescent ceramic layer, so that the optical path of the exciting light in the wavelength conversion layer is increased, the light utilization rate of the exciting light is greatly improved, and the light conversion efficiency is improved. The scattering particles may be scattering particles such as alumina, yttria, zirconia, lanthana, titania, zinc oxide, barium sulfate, etc., and may be either single-material scattering particles or a combination of two or more kinds, and the scattering particles are characterized by apparent white color, ability to scatter visible light, stable material, ability to withstand high temperature, and particle size in the same order of magnitude or one order of magnitude lower than the wavelength of the excitation light. In other embodiments, the scattering particles may be replaced by air holes with the same size, and the difference between the refractive index of the air holes and the refractive index of the matrix or the adhesive is used to realize total reflection so as to scatter the excitation light or the stimulated light.

The fluorescent ceramic may also be another composite ceramic layer that differs from the above-described complex phase fluorescent ceramic only in the ceramic matrix. The ceramic matrix is pure-phase fluorescent ceramic, namely the ceramic matrix is provided with an activator and can emit stimulated light under the irradiation of exciting light. The technical scheme integrates the advantages of high luminous efficiency of the luminescent ceramic particles of the complex phase fluorescent ceramic and the advantages of luminous performance of the pure phase fluorescent ceramic, and utilizes the luminescent ceramic particles and the fluorescent ceramic matrix to emit light, so that the luminous efficiency is further improved. In the wavelength conversion layer, scattering particles or pores can be added as well to enhance internal scattering.

The light-emitting material (e.g., phosphor) of the wavelength conversion layer is not limited to a single material, and may be a combination of a plurality of materials, or may be a stacked combination of a plurality of material layers. The volume distribution of the luminescence centers in the wavelength conversion layer is not limited to a uniform distribution, and may be a non-uniform distribution such as a gradient distribution.

The selective light-transmitting film 133 is disposed at a light-incident end of the light guide 131, and has a certain light-selecting characteristic, and a certain predetermined relationship exists between a light transmittance and a wavelength and an incident angle of the laser, so that the laser can efficiently enter the light guide 131, and the laser entering the light guide 131 is prevented from escaping, and specifically, the characteristics of high transmission of blue light at a small angle (for example, less than 20 degrees), high reflection of yellow light, high reflection of blue light at a large angle, high reflection of yellow light, and the like can be realized. Because the light beam angle range of the laser is small, most of the incident laser can be ensured to enter the light guide body. It is understood that in some embodiments, no selective light-transmitting film or a selective light-transmitting film with other optical properties may be disposed at the light-incident end of the light guide.

The microstructure 134 is disposed between the wavelength conversion layer 132 and the light guide 131, and is configured to improve a ratio of laser light in the light guide 131 entering the wavelength conversion layer 132, and a specific structure of the microstructure may be one of a thread, a random micro-nano particle, an ordered groove and the like on the surface of the light guide 131, which is not limited herein and may be obtained by mechanical processing, chemical etching and the like.

And scattering particles 135 provided on an end surface of the light guide 131 where the first protective element 14 is provided, for enhancing scattering or reflection of the laser light.

The first protection element 14 is disposed at the light incident end of the light emitting body 13 and abuts against the wavelength conversion layer 132 of the light emitting body 13, so as to protect the light emitting body 13, optionally, the first protection element 14 may be made of one of aluminum, copper, alloy, temperature-resistant resin, and high thermal conductivity ceramic, and is a high heat dissipation structure, optionally, the heat dissipation structure may be one of fin-shaped, spiral-grained, groove-shaped, needle-shaped, or a coating structure for improving heat dissipation capability, and a high reflective material for increasing thermal conductivity, such as silver paste, may be selectively filled between the first protection element 14 and the light emitting body 13, specifically, the first protection element 14 has a structure with a high reflective cavity surface inside, and the first protection element 14 not only can enhance heat dissipation, but also can prevent laser in the light emitting body 13 from leaking out, and further reflects laser projected onto the first protection element 14 into the light emitting body 13, the propagation utilization of the laser is improved.

Alternatively, reflective particles or the like may be disposed between the first protection element 14 and the contact surface of the bottom end of the light emitter 13 to enhance reflection.

One end of the heat conducting element 15 is attached to the periphery of the light emitting body 13 and abuts against the wavelength conversion layer 132, and the other end is attached to the heat dissipation base 16. In the embodiment, the heat conducting element 15 and the heat dissipating base 16 together form a receiving cavity, specifically, the partial cavity formed by the heat conducting element 15 and the heat dissipating base 16 includes the light source 11 and the light conducting component 12, and the laser has strong heat generation, the heat conducting element 15 is used not only for fixing but also for enhancing heat dissipation, and optionally, the material thereof may be one of aluminum, copper, temperature-resistant resin, and high-thermal-conductivity ceramic, the structure of the heat dissipation structure can be one of fin-shaped, finned, spiral-grained, groove-shaped, needle-shaped or coating structure for improving heat dissipation capability, the interior of the heat conducting element is also a high reflection cavity surface, and further, one end of the heat conducting element is fixed with the heat dissipation base 16 by mechanical fixing, sticking and the like, and the other end is fixed by surrounding the bottom end of the luminous body 13.

And the heat dissipation base 16 is used for further enhancing heat dissipation, two ends of the heat dissipation base are respectively fixed with the heat conduction element 15, and the light source 11 is installed on the heat dissipation base 16.

It should be understood that the light-conducting component 12 is not essential to the present application, and the light-conducting component 12 may not be included in the case of changing the exit light path of the light source 11.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a lighting device according to a second embodiment of the present application.

Referring to fig. 3 and fig. 1, compared to fig. 1, a second protection element 17 is further added outside the wavelength conversion layer.

In addition, in this embodiment, the light conducting assembly specifically includes two optical elements, including a convex lens and a concave lens, the convex lens is used for converging laser, and the concave lens can adjust the laser after convergence, so that the angle of the laser incident into the light emitting body is changed.

And the second protection element 17 is arranged on the light path of the illuminating light of the luminous body, two ends of the second protection element are respectively connected with the first protection element 14 and the heat conduction element 15, the second protection element is used for protecting the wavelength conversion layer, has the functions of dust prevention and water prevention, and is made of transparent materials, and two surfaces of the second protection element include but are not limited to antireflection films and self-cleaning films. The reflection phenomenon during laser emission can be reduced, the cleanliness is improved, and the second protective element 17 is installed on one or two of the first protective element and the heat conducting element through mechanical fixing parts and adhesives or directly installed on the wavelength conversion layer through a mode of thermal curing and sintering.

The specific structure and principle of the first embodiment have already been described, and are not described herein again.

And it should be understood that the second protective element 17 may be selectively installed in accordance with the working environment of the lighting device, such as in a dust-free lamp chamber.

According to the embodiment, the non-luminous layer on the light guide body covers the protection element, and the purposes of heat dissipation and reflection are achieved through the heat dissipation structure and the high-reflection structure of the protection element, so that laser can be uniformly transmitted in the light guide body, the purpose of uniform temperature in the light guide body is achieved, and the luminous efficiency is enhanced.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a lighting device according to a third embodiment of the present application. The lighting device 20 improved in the present embodiment includes: the laser lamp comprises a light source 21 for emitting laser, a light conduction assembly 22 for conducting and converging the laser emitted by the light source 21, a light emitter 23 for receiving the light conducted by the light conduction assembly 22, a first protection element 24 arranged on the light emitter 23 and used for protecting the light emitter 23, a heat conduction element 25 arranged around the light source 21 and the light conduction assembly 22, and a heat dissipation base 26 attached to one end of the heat conduction element 25, wherein the heat conduction element 25 and the heat dissipation base 26 form an accommodating cavity.

The light source 21 is used for emitting laser light, and specifically, the laser light is a plurality of sets of laser light in this embodiment, but in other embodiments, the number of the laser light is not limited.

The light guide assembly 22 is configured to guide the laser light emitted by the light source 21 and adjust an incident angle, so that the laser light is perpendicularly incident into the light emitting body 23. The direction of the laser is changed by the large lens, so that the laser can be incident in parallel with the light-emitting body 23 and is arranged in a containing cavity formed by the heat conducting element 25 and the heat dissipation base 26.

What is different from the above, in the present embodiment, the contact surface of the first protection element 24 and the light emitter 23 is a cambered surface, so that the laser can more uniformly cover the light emitting surface of the light emitter after being reflected at the position of the cambered surface. Further, in a preferred embodiment of the present invention, the distance from the arc surface to the light-emitting surface is closer to the distance from the light-entering end to the light-emitting surface. In the technical scheme, the cambered surface can be regarded as a light inlet end, the light inlet end is closer to the light outlet surface than the real light inlet end, the laser uniformly covers the light outlet surface by adjusting the shape of the cambered surface, the adverse effect of too close distance between the luminous body and two heat sources of the light source caused by too close distance between the real light inlet end and the light outlet surface is avoided, and the problem of light loss caused by continuous reflection of the laser in the luminous body to realize uniformity is reduced.

In this embodiment, the specific structures and functions of the first protection element 24, the heat conduction element 25, and the heat dissipation base 26 are the same as those of the corresponding components in the embodiments described in fig. 1 to fig. 3, and are not described again here.

Referring to fig. 5, fig. 5 is a schematic structural diagram of another embodiment of a light emitter.

However, in the present embodiment, the laser enters the light emitting body 23 in parallel, and fig. 5 includes the selective light-transmitting film 235, so that when the laser is incident perpendicularly, the laser is incident in parallel to the light guide 231, and the direction is the other end of the light guide 231 far from the light incident end, and therefore the laser directly enters the other end far from the light incident end, but in the present embodiment, the other end of the light guide 231 is in an arc structure, and similarly, the inside of the first protection element 24 corresponding to the outside of the other end of the light guide 231 far from the light incident end is also in the same corresponding high-reflection arc structure, so that the laser can be reflected back by changing a certain angle, and the direction is the side wall of the light guide 231.

The following detailed description is made with reference to fig. 4 and 5 for the working principle of the lighting device:

the light source 21 emits a plurality of sets of laser light through the optical fibers and the lens in the light conducting assembly 22, so that the laser light is incident in parallel into the light emitting body 23, specifically into the light guiding body 231 in the light emitting body 23, and the laser light is conducted in parallel in the light guiding body 231 to the bottom end, wherein the bottom end surface is a high-reflection arc surface, so that the laser light is reflected back to the light guiding body 231 at a changed angle, since the heat conducting element 25 covering the light guiding body 231 and the inside of the first protection element 24 are high-reflection cavity surfaces, the laser light is reflected back into the light guiding body 231 after encountering the heat conducting element 25 and the first protection element 24 until the laser light is in the direction of the wavelength conversion layer 232, the laser light passes through the wavelength conversion layer 232 and is emitted after performing wavelength conversion, and due to the microstructure 234, the probability of the laser.

Further, after entering the light guide 231, the laser light encounters the first protection element 24 covering the end during the propagation process, so that the laser light cannot be directly emitted, is re-reflected into the light guide 231 again by the high-reflection arc surface inside the first protective member 24, most of the light uniformly irradiates the position of the wavelength conversion layer 232 corresponding to the light emitting surface under the action of the cambered surface, the remaining light rays undergo multiple reflections until they exit through the lateral wavelength converting layer 232, forming illumination light, rather than being incident and exiting in a single direction, so that the temperature of the laser light generated is uniform in the light guide 231, so that the light emitting efficiency is more uniformly and stably distributed, and at the same time, since the first protective member 24 and the heat conductive member 25 coated on the light guide 231 have a strong heat dissipation structure, the heat dissipation of the whole luminous body 23 is good, and the problem that the laser is directly emitted from the tail end to hurt the vision and the like is avoided.

The above embodiment controls the propagation direction of the laser light by using the optical fiber and the lens, reduces the loss, and changes the angle of the laser light directly incident thereon to reflect into the light guide again by adopting the high-reflection arc surface at the end of the light guide far away from the light incident side.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a lighting device according to a fourth embodiment of the present application. The lighting device 30 improved in the present embodiment includes: the light source 31 is used for emitting laser, the light conduction component 32 is used for conducting and converging the laser emitted by the light source 31, the light emitter 33 is used for receiving the light conducted by the light conduction component 32, the first protection component 34 is arranged on the light emitter 33 and used for protecting the light emitter 33, the heat conduction component 35 is arranged around the light source 31 and the light conduction component 32, the heat dissipation base 36 is arranged in a manner of being attached to one end of the heat conduction component 35, the second protection component 37 is arranged outside the light emitter 33, two ends of the second protection component are respectively connected with the heat conduction component 35 and the first protection component 34, and the heat conduction component 35 and the heat dissipation base 36 form an accommodating cavity.

The light conducting assembly 32 is configured to converge the laser light emitted by the light source 31 and adjust an incident angle, so that the laser light is perpendicularly incident into the light emitting body 33, and in this embodiment, the light conducting assembly 32 specifically includes a positive lens and a negative lens, and is configured to converge and change a light angle, and enable the laser light to be incident in parallel to the light emitting body 33, and is disposed in an accommodating cavity formed by the heat conducting element 35 and the heat dissipation base 36.

In this embodiment, the specific structures and functions of the first protection element 34, the heat conducting element 35, and the heat dissipation base 36 are the same as those of the corresponding components in the above embodiments, and are not described again here.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another embodiment of a light emitter.

Among them, the light emitter 33 in this embodiment includes: a fluorescent light guide 331, a selective light-transmitting film 332 attached to the light-entering end of the fluorescent light guide 331, a high refractive medium 333 attached to the outer surface of the light-emitting layer not covered by the fluorescent light guide 331, and a scattering structure 334 attached to the end face of the fluorescent light guide 331 and the first protective element 34 (the scattering structure 334 may not be required).

Specifically, the fluorescence light guide 331 is configured to guide and wavelength-convert the laser light so that the laser light enters the fluorescence light guide 331, and not only can be guided back and forth in the fluorescence light guide 331, but also the laser light during the guiding process can be wavelength-converted and emitted through the uncovered light emitting layer to form the illumination light.

The material of the fluorescence light guide 331 is similar to the wavelength conversion layer described above, and may be fluorescent silica gel, fluorescent glass, or fluorescent ceramic/single crystal.

The light-emitting surface of the light-emitting body 33 agrees to be provided with a high-refraction medium or a microstructure, and the working principles of the high-refraction medium or the microstructure are different, wherein the microstructure changes the incident angle of the incident light-emitting surface to avoid total reflection to realize light emission, and the high-refraction medium changes the total reflection angle without changing the incident angle to realize light emission. The emission of the illumination light converted by the fluorescence light guide 331 can be enhanced.

It should be noted that, in this embodiment, only a method for combining the wavelength conversion layer and the light guide body is provided, and other structures and applications in this embodiment are similar to those in the above embodiment, and are not described again here.

Furthermore, in other embodiments, a wavelength conversion layer may be disposed on the light emitting surface of the fluorescence light guide 331 to enhance the wavelength conversion and prevent incomplete conversion in the fluorescence light guide 331.

The following detailed description will be made with reference to fig. 6 and 7, specifically regarding the working principle of the lighting device:

the laser emitted by the light source 31 is converged by the light conduction assembly 32, and then the converged laser is further adjusted, so that the emergent laser is incident into the luminous body 33 in parallel, specifically into the fluorescence light guide body 331 in the luminous body 33, so that the laser is converted into white light by wavelength, when the white light encounters the first protection element 34 and the heat conduction element 35 which cover the surface of the fluorescence light guide body 331, the white light is reflected back and forth in the fluorescence light guide body 331 due to the high-reflection structure inside the first protection element 34 and the heat conduction element 35 until the illumination light is formed by emergent light from the uncovered light emergent surface, and the emergent probability of the laser transmitted between the fluorescence light guide bodies 331 is increased due to the action of the high-refraction medium 333.

Further, after the laser light enters the fluorescence light guide 331, in the process of propagating after being converted into white light, the first protective element 34 covering the end is encountered, so that the white light cannot be directly radiated out, the scattering particles 334 passing through the reflective surface inside the first protective element 34 and the end surface of the fluorescent light guide 331 are reflected again into it, so that the white light propagates back and forth between the fluorescence light guide 331 until it is emitted through the side light emitting layer to form illumination light, instead of being incident and emitted in a single direction, so that the temperature of the laser light and the white light generated is uniform in the fluorescence light guide 331, so that the luminous efficiency is more uniformly and stably distributed, and at the same time, since the first protective member 34 and the heat conductive member 35 that are overlaid on the fluorescent light guide 331 have a strong heat dissipation structure, the heat dissipation of the whole luminous body 33 is good, and the problem that the eyesight is damaged due to the fact that laser is directly emitted from the tail end is avoided.

In the above embodiment, by combining the waveguide element and the wavelength conversion layer, not only the conduction of laser light but also the conversion of wavelength are realized, thereby saving the cost and improving the process.

Please refer to fig. 8, fig. 8 is a schematic structural diagram of a fifth embodiment of the lighting device of the present application. And is a further extension of fig. 1, the lighting device 40, which is improved in this embodiment, comprises: the fluorescent light guide device comprises a light source 41 for emitting laser, a light conduction assembly 42 for conducting and converging the laser emitted by the light source 41, a light-emitting body 43 for receiving the light conducted by the light conduction assembly 42, a first protection element 44 arranged on the light-emitting body 43 and used for protecting the light-emitting body 43, a heat conduction element 45 arranged around the light source 41 and the light conduction assembly 42, and a heat dissipation base 46 attached to one end of the heat conduction element 45, wherein a reflection cup structure 48 of the fluorescent light guide body in the light-emitting body 43 is designed on the first protection element 44 and the heat conduction element 45, and the structure is also arranged at the light inlet positions of the heat conduction element 45 and the light-emitting body 43, wherein the heat conduction element 45 and the heat dissipation base 46 form an accommodating cavity.

Referring to fig. 8 and fig. 1, in the present embodiment, compared to fig. 1, the first protection element 44 and the heat conduction element 45 further include a reflective cup 48 near the fluorescent light guide body of the light emitting body 43, and the light incident end of the light guide body of the heat conduction element near the light emitting body 43 also further includes a reflective cup 48, so that the laser is better utilized and the light utilization rate is improved.

The embodiment further optimizes the design of the reflecting cup, thereby further improving the light conversion efficiency and the utilization rate.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a lighting device according to a sixth embodiment of the present application. And is a further extension on figure 8.

The lighting device 50 improved in the present embodiment includes: a light source 51 for emitting laser, a light conduction assembly 52 for conducting and converging the laser emitted by the light source 51, a light emitter 53 for receiving the light conducted by the light conduction assembly 52, a first protection element 54 disposed on the light emitter 53 and for protecting the light emitter 53, a heat conduction element 55 disposed around the light source 51 and the light conduction assembly 52, and a heat dissipation base 56 attached to one end of the heat conduction element 55, a reflective cup structure 58 designed on the first protection element 54 and the heat conduction element 55 near the fluorescent light guide in the light emitter 53, and the structure is also provided at the light entrance positions of the heat conduction element 55 and the light emitter 53; the heat conducting element 55 and the heat dissipating base 56 form a receiving cavity.

In the present embodiment, with respect to fig. 8, the light source 51 used in the present embodiment uses multiple light source inputs, that is, uses a plurality of lasers, so as to increase the brightness, but in other embodiments, the number of lasers is not limited herein.

The above embodiment improves the stable input laser light by changing the number of lasers in the light source.

As described above, some of the embodiments provided in the present application may be replaced or reduced in specific use, for example, the light conducting component is not included in the case of improving the light source, the second protection component may not be needed in some environments where the sealed cavity works, and the heat conducting component and the heat dissipation base thereof may be replaced by a common fixing structure in certain cases.

In the embodiments, for example, the light emitting body composed of the light guide and the wavelength conversion layer and the light emitting body composed of the fluorescent light guide may be replaced with each other in each embodiment, and some wavelength conversion devices commonly used in the market may be used for wavelength conversion, transmission, and the like, which is not limited herein.

In summary, as those skilled in the art can easily understand, the present application provides a lighting device, which increases the heat dissipation area, reduces the heat dissipation requirement, and enables laser to be conducted back and forth in the light emitting body by separating the light source and the light emitting body and installing the first protection element at the other end of the light emitting body away from the incident light side, thereby enhancing the thermal stability inside the light emitting body, increasing the light emitting efficiency, avoiding the direct irradiation of laser, greatly enhancing the light emitting efficiency, and improving the practicability.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

1. An illumination device, comprising:

a light source for emitting laser light;

the luminous body is used for receiving the laser emitted by the light source and performing wavelength conversion to form illumination light, the luminous body comprises a light inlet end and a bottom end opposite to the light inlet end, and a light outlet surface of the luminous body is arranged on the side surface between the light inlet end and the bottom end;

the first protection element covers and is arranged on the outer surface of the bottom end of the luminous body and used for preventing the light of the luminous body from being emitted from the bottom end.

2. A lighting device as recited in claim 1, wherein a surface of said first protection element which is in contact with said light emitter is a reflective surface, or a surface of said light emitter which is in contact with said first protection element is a reflective surface, or a reflective material is filled between said first protection element and a contact surface of said light emitter.

3. A lighting device as recited in claim 1, wherein a bottom end of said light emitter is provided with a diffuser structure.

4. A lighting device as recited in claim 1, wherein said first protective element comprises a heat sink structure.

5. The illumination device as recited in claim 1, wherein the light emitter comprises a light guide and a wavelength conversion layer disposed at the light exit surface, and the laser light enters the light guide from the light entrance end and exits from the light exit surface after passing through the wavelength conversion layer.

6. The illumination device of claim 5, wherein the wavelength conversion layer is a fluorescent silica gel, a fluorescent glass, a fluorescent ceramic, or a quantum dot film.

7. The illumination device according to claim 5, wherein a surface of the light guide in contact with the wavelength conversion layer is provided with a microstructure.

8. The illumination device as claimed in claim 5, wherein the light incident end is provided with a selective light-transmitting film for transmitting the laser light with a small angle of incidence and reflecting other light.

9. The illumination device as recited in claim 1, wherein the light emitter is a fluorescent light guide, and the laser light enters the fluorescent light guide from the light entrance end, is subjected to wavelength conversion by the fluorescent light guide, and exits from the light exit surface.

10. A lighting device as recited in claim 9, wherein said light-emitting surface of said light emitter is provided with a high refractive medium and/or microstructure.

11. A lighting device as recited in claim 1, wherein a bottom end surface of said light emitter is an arc surface.

12. A lighting device as recited in claim 1, further comprising a light conducting element disposed between said light source and said light emitter for conducting laser light emitted from said light source to a light input end of said light emitter.

13. The illumination device of claim 12, wherein the light conducting component comprises one or more of an optical lens, an optical fiber.

14. A lighting device as recited in claim 12, further comprising a heat conducting element and a heat dissipating base, wherein two ends of said heat conducting element are respectively fixedly connected to said heat dissipating base and said light emitting body, said heat conducting element and said heat dissipating base form a receiving cavity, and said light source and said light conducting assembly are disposed in said receiving cavity.

15. A lighting device as recited in claim 14, wherein a connecting surface of said heat conducting element with said light emitter and an inner wall of said cavity are reflective surfaces.

16. A lighting device as recited in claim 15, further comprising a second protective element which is disposed on an optical path of illumination light of said light emitter and has high light transmittance, wherein two ends of said second protective element are respectively connected to said first protective element and said heat conducting element.

17. A lighting device as recited in claim 13, wherein a heat conducting material is filled between said heat conducting element and said heat sink base and/or between said heat conducting element and said light emitter and/or between said light emitter and said first protection element.