CN110906272B - Light source device and car light - Google Patents
Light source device and car light Download PDFInfo
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- CN110906272B CN110906272B CN201811075945.4A CN201811075945A CN110906272B CN 110906272 B CN110906272 B CN 110906272B CN 201811075945 A CN201811075945 A CN 201811075945A CN 110906272 B CN110906272 B CN 110906272B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/24—Light guides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
- F21S43/235—Light guides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/50—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
- F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention protects a light source device, comprising a laser light source, a light source control unit and a control unit, wherein the laser light source is used for emitting exciting light; the light guide body is arranged on an emergent light path of the laser light source and used for transmitting exciting light, the light guide body comprises a diffusion section and a light emitting section which are sequentially arranged along the transmitting direction of the exciting light, and the diffusion section is provided with a first diffuse reflection structure; and the wavelength conversion layer is arranged on the surface of the light emitting section of the light guide body, and can absorb the exciting light and emit stimulated light with the wavelength different from that of the exciting light. The light source device enables the excitation light with Gaussian distribution emitted by the laser light source to be changed in light angle distribution before reaching the light emitting section of the light guide body, so that more excitation light irradiates the laser light source section close to the wavelength conversion layer, the excited emission uniformity of the wavelength conversion layer is improved, and the color uniformity of the emitted light of the light source device is improved. The invention also protects a related vehicle lamp.
Description
Technical Field
The invention relates to the technical field of illumination, in particular to a light source device and a car lamp.
Background
With the increasing demand for energy consumption of special lighting, such as car light lighting, searchlight, and street lamp, the cold light source represented by LED light source gradually replaces the prior heat light source such as halogen lamp, and becomes the mainstream of the market. However, the LED has low luminous efficiency, and the energy conversion efficiency is reduced especially under high power and large current. In high-end lighting demand scenarios, it is often necessary to integrate an LED array to achieve high luminous flux emission, which leads to increased cost, bulkiness of light source volume, and reduced reliability.
With the development of laser diode technology and the reduction of cost, another technical scheme draws more and more attention to laser remote excitation of fluorescent materials. The blue-violet laser with high power and high energy density excites a yellow fluorescent material to emit yellow fluorescence, and then the blue-violet laser and the yellow fluorescence are mixed to obtain white light with high brightness, and the technology is also called as laser illumination.
The laser illumination has the advantages of high brightness, long illumination distance and controllable illumination spot shape. The requirement for the illumination light source generally requires that the illumination light spot has a uniform color and a long illumination distance, which requires that the light emitting point (i.e., the fluorescent material position) of the illumination light source is located near the focal point of the light receiving element. However, when the light emitting area is small, the local temperature of the fluorescent material is relatively high, so that heat dissipation to the fluorescent material is a necessary condition for improving the brightness. Therefore, a light source which has a light emitting area as large as possible, a small distance from the focal point of the light receiving element, and can effectively dissipate heat is required.
As shown in fig. 1, in a prior art, a light source device 10 includes a laser light source 110, a light guide 120, and a wavelength conversion layer 130, wherein the light guide 120 is a cylinder, and the wavelength conversion layer 130 is disposed around the surface of the cylinder at the end of the light guide 120. The laser light emitted from laser light source 110 is incident into light guide 120, guided to the end of light guide 120, enters wavelength conversion layer 130 through the surface of light guide 120 in contact with wavelength conversion layer 130, excites the fluorescent material, and then generates fluorescence. This technical scheme is through the cylindrical setting that surrounds light conductor 120 with the wavelength conversion layer 130 that contains fluorescent material, has increased fluorescent material receiving laser's area on the one hand, has reduced excitation light power density for fluorescent material's heat production reduces, and on the other hand has increased fluorescent material and light conductor's area of contact, has improved the thermal heat dissipation channel that fluorescent material produced, has consequently compromise the luminous point and has little and dispel the heat good advantage.
However, the present inventors found in experimental exploration that since the laser light is gaussian distributed light, the angular distribution of the light beam is extremely uneven, and the light energy density at the center of the light beam is much greater than that at the edge angles of the light beam, resulting in a change in the energy density of light propagating through light guide body 120 and incident obliquely to wavelength-converting layer 130 with a change in the incident position along the axial direction of light guide body 120. The laser energy density is small near the position of the laser light source 110; the position far away from the laser light source has large laser energy density. This causes spatial unevenness in the degree of excitation and heat generation of the wavelength conversion layer 130, which in turn causes spatial unevenness in the color coordinates of the outgoing light from the wavelength conversion layer 130, which finally appears as unevenness in the color of the outgoing light from the light source device 10.
Disclosure of Invention
Aiming at the defect of uneven emergent light color of the light source device in the prior art, the invention provides a light source device with improved emergent light color uniformity, which comprises a laser light source, a light source module and a light source module, wherein the laser light source is used for emitting exciting light; the optical conductor is arranged on an emergent light path of the laser light source and used for conducting the exciting light, the optical conductor comprises a diffusion section and a light emitting section which are sequentially arranged along the conducting direction of the exciting light, and the diffusion section is provided with a first diffuse reflection structure; and the wavelength conversion layer is arranged on the surface of the light emitting section of the light guide body, and can absorb exciting light and emit stimulated light with the wavelength different from that of the exciting light.
Compared with the prior art, the invention has the following beneficial effects: the wavelength conversion layer used for converting the exciting light is arranged on the surface of the light emitting section of the light guide body, and the diffusion section is additionally arranged on the upstream light path of the light emitting section, so that the light angle distribution of the exciting light emitted by the laser light source in Gaussian distribution is changed before the exciting light reaches the light emitting section of the light guide body, especially, the light originally incident to the upstream side wall of the light guide body close to the light emitting section is converted into the diffused light, the situation that the part of the light directly passes through the near laser light source section (namely the part close to the laser light source) of the wavelength conversion layer after being reflected by the side wall of the light guide body is avoided, more exciting light is irradiated on the section of the wavelength conversion layer close to the laser light source, the excited emission uniformity of the wavelength conversion layer is improved, and the color uniformity of the emergent light of the light source device is improved.
In one embodiment, the first diffuse reflecting structure is provided on a surface of the diffusing section of the light guide body. This technical scheme makes only incidenting the light on light conductor diffusion section surface just changed the light distribution, and other can not hinder towards the light-emitting section transmission at the exciting light of light conductor inner space conduction, has reduced the light loss that the backscattering brought on the one hand, and on the other hand does not change the exciting light of originally direct incidence wavelength conversion layer, is convenient for realize incidenting to the spatial uniformity of the exciting light of wavelength conversion layer through the size of independently adjusting the diffusion section. In this technical solution, the first diffuse reflection structure may be a layer structure (i.e., a diffuse reflection layer) formed by the light scattering particles and the binder, and may also be a concave-convex microstructure on the surface of the optical conductor.
In one embodiment, the light guide body is a solid light guide, the first diffuse reflection structure is provided on an outer surface of a diffusing section of the light guide body, and the wavelength conversion layer is provided on an outer surface of a light emitting section of the light guide body.
In one embodiment, the diffusing segment is disposed adjacent to the light emitting segment. Because the solid light guide realizes light beam transmission by utilizing the total reflection principle, the requirement is met that the light incident to the wall surface of the solid light guide is not less than the critical angle of total reflection. When a diffusing section is arranged in the upstream light path of the light-emitting section, so that the angular distribution of part of the light is changed, at least part of the diffusely reflected light will no longer meet the total reflection condition when being incident again on the solid light guide wall surface, and the part of the light will possibly escape out of the light conductor. This technical scheme is through making diffusion section and luminous section adjacent setting, has avoided escaping from the light conductor by the light of change angle behind the diffusion section, has reduced light loss.
In one embodiment, the length of the diffusing segment is less than the length of the light emitting segment. The technical scheme avoids the overuse of the upright post, prevents the overlarge illuminance of the initial section of the light-emitting section, and ensures the uniformity of the illuminance of the exciting light of the light-emitting section.
In one embodiment, further, the length of the diffusion section is smaller than the length of the light-emitting section, and the length of the diffusion section is not smaller than 1/3 of the light-emitting section.
In one embodiment, the light guide body is a hollow light guide, the first diffuse reflection structure is provided on an inner surface or an outer surface of a diffusion section of the light guide body, and the wavelength conversion layer is provided on an inner surface and/or an outer surface of a light emitting section of the light guide body.
In one embodiment, the first diffuse reflection structure is provided in an inner space of the light guide body. In the technical scheme, the first diffuse reflection structure blocks between the incident end of the optical conductor and the light emitting section, and all the exciting light passes through the diffusion section (whether directly penetrates or is scattered by the diffusion section) and then reaches the light emitting section, which is equivalent to changing the light distribution of the original exciting light again.
In one embodiment, the wavelength conversion layer includes at least one of a fluorescent resin, a fluorescent silica gel, a fluorescent glass, a fluorescent ceramic, or a fluorescent single crystal.
In one embodiment, the wavelength conversion layer comprises at least two fluorescent materials, which are arranged in a mixed manner, in layers or in regions. The color coordinates of emergent light can be corrected by arranging multiple fluorescent materials, so that the color coordinates are more suitable for practical application. Specifically, the mixing arrangement may be uniform mixing or non-uniform mixing of two fluorescent materials; the wavelength conversion sublayers are arranged in a layered manner and respectively contain different fluorescent materials; the sub-regions are arranged to contain wavelength conversion sub-layers of different fluorescent materials respectively covering different position regions of the photoconductor.
In one embodiment, the light guide further comprises an end located downstream in the light path of the light emitting section, said end being provided with a second diffuse reflecting structure. In this technical scheme, through set up second diffuse reflection structure at the light conductor end, can prevent on the one hand that the exciting light from revealing, on the other hand makes this part of light be reflected back to the light-emitting section again and is utilized, through second diffuse reflection structure, changes the light distribution of this part of light.
In one embodiment, the second diffuse reflecting structure has a diffuse reflection angle that is less than the diffuse reflection angle of the first diffuse reflecting structure. This technical scheme makes the partial illuminance that the light-emitting section is close to the diffusion section improve, makes the partial illuminance that the light-emitting section is close to the end reduce simultaneously, has realized the whole even effect of excitation illuminance distribution of light-emitting section.
In one embodiment, the second diffuse reflecting structure is a gaussian reflecting structure and the first diffuse reflecting structure is a lambertian reflecting structure. The technical scheme enables the light reflected by the second diffuse reflection structure to be approximately Gaussian distributed, namely the central energy density of the light beam is high, the edge energy density is low, the concentration of the reflected light on the light emitting section closest to the tail end is avoided, and the uniformity of the exciting light power density distribution space of the wavelength conversion layer is realized to the greatest extent.
In one embodiment, the light guide further comprises a heat sink sleeved at the tail end of the light guide body, and the heat sink is opaque. In the technical scheme, the arrangement of the light-tight radiator further ensures the light safety, and even under the condition that the second diffuse reflection structure falls off, the laser leakage is still prevented; in addition, the heat radiator is arranged at the tail end, so that the heat emitted by the wavelength conversion layer of the light-emitting section can be simultaneously transferred to the upstream and the downstream of the light path, and the heat transfer efficiency and the temperature uniformity are improved.
In one embodiment, the light guide body further comprises a heat dissipation section, the heat dissipation section is close to the incident end of the light guide body relative to the diffusion section, and the periphery of the heat dissipation section of the light guide body is provided with a heat dissipation structure. The technical scheme improves the heat dissipation efficiency of the wavelength conversion layer, and particularly for the scheme that the light conductor is a solid light conductor, the heat can be quickly led out through the heat dissipation section through the light conductor.
In one embodiment, the laser light source comprises light emitting elements of at least two wavelengths. For example, the blue laser light emitting element can be used for two wavelengths, one is more favorable for color representation, and the other is more favorable for exciting the wavelength conversion layer.
The invention also claims a vehicle lamp, comprising the light source device of any one of the above items, and further comprising a light collecting device, wherein the wavelength conversion layer is arranged at the focal position of the light collecting device.
Drawings
FIG. 1 is a schematic diagram of a light source device in the prior art;
fig. 2 is a schematic structural diagram of a light source device according to a first embodiment of the invention;
FIG. 3 is a diagram of light emitting sections of a light source device according to the present invention under a second different diffuse reflection configuration
A power density profile;
FIG. 4 is a graph showing the optical power density distribution of the light-emitting section in different embodiments of the light guide;
FIG. 5 is a graph showing the luminous power density distribution of the luminous section for different lengths of the diffusion section;
fig. 6 is a schematic structural diagram of a light source device according to a second embodiment of the invention;
fig. 7 is a schematic structural diagram of a light source device according to a third embodiment of the present invention;
fig. 8 is a schematic structural diagram of a light source device according to a fourth embodiment of the present invention;
fig. 9 is a schematic structural diagram of a light source device according to a fifth embodiment of the present invention.
Detailed Description
The present invention is derived from the technical solution that laser light is incident to the wavelength conversion layer on the surface of the light guide body through the light guide body, as described in the background art, the light emission of the wavelength conversion layer is not uniform due to the non-uniform irradiation of the laser light with gaussian distribution formed at the incident surface of the wavelength conversion layer, thereby further causing the non-uniform heat generation and the non-uniform spatial distribution of the emitted light color of the wavelength conversion layer. To solve this problem, the inventors have started from the source that the uniformity of the emitted light from the wavelength conversion layer can be ensured as long as the uniformity of the excitation light at the incident surface of the wavelength conversion layer can be achieved.
The inventor has found through analysis that the excitation light nonuniformity of the incident surface of the wavelength conversion layer is mainly represented by that the excitation light illuminance of the incident surface of the wavelength conversion layer is increased along with the distance from the incident end of the light conductor, and in order to increase the excitation light illuminance close to the incident end, the excitation light distribution needs to be redistributed, so that a part of the excitation light reaching the wavelength conversion layer far from the incident end is distributed to the part of the wavelength conversion layer close to the incident end. The inventors have studied and found that, as shown in fig. 1, the divergence angle of the laser light is small, and therefore, when the laser light propagates in the optical waveguide, the positions of the two reflections are far apart, and the light incident on the a point near the wavelength conversion layer 130 is inevitably not incident on the portion of the wavelength conversion layer near the incident end of the optical waveguide. The inventors have changed the light distribution of light that is inevitably not incident on the portion of the wavelength-converting layer near the incident end by providing the diffusion section upstream in the optical path of the light-emitting section, so that the probability of its incidence on the portion of the wavelength-converting layer near the incident end is increased, thereby improving the illuminance uniformity of the incident light of the wavelength-converting layer.
In the present invention, the wavelength conversion layer is a light functional layer having a wavelength conversion function, and is capable of absorbing excitation light emitted from the laser light source and emitting excited light having a wavelength different from that of the excitation light. The wavelength converting layer contains a wavelength converting material, most typically a phosphor.
The wavelength conversion layer comprises at least one of fluorescent resin, fluorescent silica gel, fluorescent glass, fluorescent ceramic or fluorescent single crystal, and the layer structure is characterized in that a fluorescent material is used as a luminescence center, and the fluorescent material is bonded into a layer through different media or directly grown into a layer. The fluorescent glass is a structure in which the fluorescent powder is bonded into a layer through glass powder after being softened, the fluorescent ceramic is a structure in which the fluorescent material is bonded into a layer through a ceramic material after being sintered, and the fluorescent single crystal is a structure obtained by growing a raw material of the luminescent material into a single crystal through high-temperature treatment.
Specifically, in the case that the laser light source of the present invention is blue light, the phosphor or the phosphor material may be Ce: YAG, Ce: LuAG, or the like, and may absorb the blue light and emit yellow light, green light, or a nitride phosphor capable of emitting red light. When the wavelength conversion layer is a fluorescent ceramic, Al may be used2O3AlN or Y3Al5O12The fluorescent powder is wrapped in a transparent ceramic matrix. The wavelength conversion layer can further comprise scattering structures such as air holes and white scattering particles (such as micron-sized oxides and nitrides), so that the optical path of exciting light in the wavelength conversion layer is lengthened, and the light emitting efficiency and the light emitting uniformity are improved.
In some embodiments of the present invention, the wavelength conversion layer may further include a plurality of fluorescent materials, for example, at least two fluorescent materials, and different fluorescent materials may be uniformly mixed in one layer to modify the color coordinates of the emitted light. In other embodiments, the different fluorescent materials may also be disposed non-uniformly, for example, the two fluorescent materials are disposed in the two wavelength conversion sublayers respectively, and disposed in a stacked manner, for example, the green wavelength conversion sublayer and the red wavelength conversion sublayer may be disposed in sequence on the optical path of the blue excitation light, so as to avoid thermal saturation and thermal degradation caused by the direct irradiation of the high-power blue light on the red fluorescent material. In other embodiments, different wavelength conversion sublayers may also be arranged in parallel in different regions, that is, different wavelength conversion sublayers cover different light-emitting sections, thereby avoiding secondary absorption and crosstalk of light of different wavelength conversion sublayers.
In the invention, the diffuse reflection angle refers to a solid angle of a light cone formed by light with the luminous intensity not less than 50% of the luminous intensity of the central light beam in emergent light after the light vertically incident to the surface of the diffuse reflection structure is subjected to diffuse reflection.
The embodiments of the present invention will be described in detail below with reference to the drawings and the embodiments.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a light source device according to a first embodiment of the invention. The light source device 20 includes a laser light source 210, a light guide 220, and a wavelength conversion layer 230.
The laser light source 210 emits laser excitation light. The optical conductor 220 is disposed on an exit light path of the laser light source 210 for conducting the excitation light. The excitation light is incident from the incident end 224 of the light guide body 220 and then is transmitted within the light guide body 220 by reflection in a direction away from the incident end 224. The light guide body 220 includes a diffusion section 222 and a light emitting section 221 which are sequentially arranged along the transmission direction of the excitation light. The diffusion section 222 is provided with a first diffuse reflection structure, in this embodiment, the first diffuse reflection structure is a diffuse reflection layer 240, and is disposed on the surface of the diffusion section 222 of the light guide body 220; the surface of the light emitting section 221 is provided with a wavelength conversion layer 230 capable of absorbing the excitation light and emitting excited light having a wavelength different from that of the excitation light.
As shown in fig. 2, the laser light emitted from the laser light source 210 is incident on the point a' of the diffusion section 222. The point a 'corresponds to the point a in fig. 1, and unlike the portion of the light ray in fig. 1 that is directly reflected and passes through the wavelength conversion layer near the light guide incident end, the light incident on the point a' is diffusely reflected to form light emitted toward various directions, and a portion of the light directly enters the portion of the light emitting section 221 near the incident end 224, so that the excitation illuminance of the portion is increased, thereby improving the uniformity of the excitation illuminance of the entire light emitting section 221.
In the present invention, the first diffuse reflection structure of the diffusion section is preferably a lambertian reflection structure, that is, the light incident to the first diffuse reflection structure is changed into the light with the lambertian distribution to exit, and this technical solution enables the light incident to the diffusion section to be changed in light distribution to the maximum extent, so that more light is guided to the part of the light emitting section near the incident end. The lambertian reflecting structure may for example be a layer structure comprising aluminum oxide and titanium oxide. Of course, in some less preferred embodiments of the present invention, the first diffuse reflection structure may also be a diffuse reflection structure between a gaussian reflection structure and a lambertian reflection structure, where the gaussian reflection structure refers to a diffuse reflection structure in which light incident on the diffuse reflection structure is changed into light having a gaussian distribution and exits.
In the present embodiment, the light guide 220 is a solid light guide, the first diffuse reflection structure 240 is disposed on an outer surface of the diffusion section 222 of the light guide 220, and the wavelength conversion layer 230 is disposed on an outer surface of the light emitting section 221 of the light guide. The light guide structure facilitates manufacturing by realizing a total reflection surface formed by a difference in refractive index between the light guide and an external medium (e.g., air) in a solid light guide along the optical axis of the light guide, and achieves a simple manufacturing process even in a small size such as a millimeter-scale length. In addition, the first diffuse reflection structure 240 is disposed on the outer surface of the light guide body 220, so that only a portion of the light distribution of the excitation light is changed, and another portion of the excitation light directly passes through the diffusion section and enters the light emitting section.
In this embodiment, the diffusing section 222 is disposed adjacent to the light emitting section 221, and light whose light distribution is changed by the diffusing section is prevented from escaping from a section between the diffusing section and the light emitting section due to a change in the exit angle (the total reflection condition of the solid light guide is no longer satisfied). Of course, in some other embodiments of the present invention, the diffusion section and the light-emitting section may be disposed not adjacent to each other, and such embodiments need to add an additional reflective structure to avoid the leakage of the excitation light, or the leakage of the excitation light may be used in such embodiments.
In this embodiment, the light guide 220 further comprises a tip 223 positioned in the optical path downstream of the light emitting section 221, the tip 223 being provided with a second diffuse reflecting structure 250. In this technical scheme, through set up second diffuse reflection structure at the light conductor end, can prevent on the one hand that the exciting light from revealing, on the other hand makes this part of light be reflected back to the light-emitting section again and is utilized, through second diffuse reflection structure, changes the light distribution of this part of light.
In this embodiment, the second diffuse reflection structure 250 is a gaussian reflection structure, and the light reflected by the second diffuse reflection structure is approximately gaussian distributed by the technical scheme, that is, the energy density of the center of the light beam is high, and the energy density of the edge of the light beam is low, so that the excitation light reflected by the second diffuse reflection structure is prevented from being concentrated at the light emitting section near the end 223, and the spatial uniformity of the power density distribution of the overall excitation light of the wavelength conversion layer 230 is realized.
In order to verify the optimal implementation mode of the second diffuse reflection structure, the invention compares the excitation light power density distribution of the light emitting sections under different second diffuse reflection structures through simulation experiments. The simulation set a solid light guide with a diameter of 2mm and a length of the light emitting section of 6mm as the light guide, and the light guide was not provided with a diffusing section, to independently test the influence of the second diffuse reflection structure.
As shown in fig. 3, four schemes of the second diffuse reflection structure are set in the simulation experiment, including that no reflection layer is arranged at the end of the optical conductor, a specular reflection layer is arranged, a lambertian reflection layer is arranged, and a gaussian reflection layer is arranged. Wherein, the horizontal axis is the position of the light emitting section along the propagation direction of the exciting light, and 0 represents the starting end of the light emitting section; the vertical axis represents the relative power density of the excitation light, and the maximum value is 1. It can be seen that whatever reflective structure is provided at the end, without providing a diffusing section upstream of the light emitting section, results in a lower excitation light illumination of the light emitting section near the entrance end of the light guide. Comparing the four curves specifically, it can be found that the power received by the light emitting section is lowest when there is no reflective layer at the end of the light conductor; when the mirror reflection layer is arranged at the tail end, the light power received by the light-emitting section is doubled, but because the angle distribution state of the original excitation light Gaussian beam is not changed by the mirror reflection, the included angle between the most reflected light and the optical axis of the optical conductor is very small, so that the original path returns to the incident end of the optical conductor and cannot be utilized; when the tail end is provided with the lambertian reflection structure, because the exciting light is converted into 180-degree lambertian light, the light with a large angle (the included angle between the light and the optical axis of the light conductor is large) can be incident to the light-emitting section within a short distance, so that the illumination intensity of the exciting light at the part, close to the tail end, of the light-emitting section is increased suddenly and is far higher than other positions of the light-emitting section; when the tail end is provided with the Gaussian reflection structure, the light distribution condition of the light-emitting section is between the specular reflection structure and the Lambert reflection structure, so that the power density of the whole exciting light is improved, and the overhigh power density of the exciting light of the part, close to the tail end, of the light-emitting section is avoided.
Further, in order to verify the influence of the diffusion section on the excitation light illuminance of the light emitting section, another simulation experiment was performed in the present invention, as shown in fig. 4, in which two schemes of setting whether the diffusion section is set or not are compared under the second diffuse reflection structure with the gaussian reflection structure at the end, and a scheme without the diffusion section and with the lambertian reflection structure at the end is used as a reference comparison for comparison with fig. 3. In the simulation, the first diffuse reflective structure of the diffusing segment is a lambertian reflective structure.
It can be seen from fig. 4 that, for the technical solution of the diffusion section, the optical power density of the portion of the light-emitting section near the incident end is significantly increased, and the optical power density of the portion of the light-emitting section near the end is slightly decreased in the same way as the solution without the diffusion section, so that the excitation light power density of the light-emitting section is more uniform and the illuminance distribution is more uniform by increasing or decreasing.
In the simulation experiment shown in fig. 4, the most preferred embodiment is that the first diffuse reflection structure is a lambertian reflection structure and the second diffuse reflection structure is a gaussian reflection structure. The inventor further verifies and finds that the technical problem of the technical scheme corresponding to the solid line in fig. 4 (that is, the initial-stage illuminance of the light-emitting section is too low, and the final-stage illuminance is too high) can be improved as long as the diffuse reflection angle of the first diffuse reflection structure is larger than that of the second diffuse reflection structure. More specifically, in a case where the diffuse reflection angles of the first and second diffuse reflection structures satisfy the above relationship, the diffuse reflection angle of the first diffuse reflection structure is greater than that of the gaussian reflection structure, and the diffuse reflection angle of the second diffuse reflection structure is smaller than that of the lambertian reflection structure.
The principle is that because the excitation light is gaussian distributed laser, the energy of the excitation light which passes through the diffusion section and the light-emitting section and directly enters the tail end is very concentrated, and is usually larger than the excitation light with large angle which can directly enter the diffusion section. Since the first diffuse reflection structure functions to make the part of the light of the changed light distribution have a larger illuminance distribution at the initial segment of the lighting segment, if the second diffuse reflection structure has the same diffuse reflection angle as the first diffuse reflection structure, the light of which the light distribution is changed again by the second diffuse reflection structure also has a similar larger illuminance distribution at the end segment of the lighting segment. In summary, the second diffuse reflection structure can receive more light than the first diffuse reflection structure, so that the uneven illumination of the light-emitting section is aggravated. Therefore, the "balance" of the illuminance distribution can be inclined toward the portion of the light emitting section near the incident end of the light guide body so that the angle of diffuse reflection of the second diffuse reflection structure is smaller than that of the first diffuse reflection structure.
In some of the above embodiments, no limitation is made on the end or the second diffuse reflection structure at the end, and it is not meant that the solution of only the diffusion section cannot solve the problem of uniformity of illumination to be solved by the present invention. It can be understood that the arrangement of the diffusion section before the light-emitting section can alleviate (rather than perfectly solve) the uneven illumination phenomenon of the light-emitting section to some extent relative to the prior art, and improve the uniformity of the excitation light of the wavelength conversion layer.
Further, in order to obtain the optimal length relationship between the diffusion section and the light-emitting section, the inventor performed another set of simulation experiments, as shown in fig. 5, to test the influence of setting different lengths of diffusion sections on the illumination uniformity of the light-emitting section under the condition that the length of the given light-emitting section is 6mm, wherein the second diffuse reflection structure is a lambertian reflection structure. In the simulation, the first diffuse reflective structure of the diffusing segment is a lambertian reflective structure.
As can be seen from fig. 5, as the length of the diffusion section increases, the optical power density of the portion of the light-emitting section near the end gradually decreases, and the optical power density of the portion of the light-emitting section near the incident end gradually increases, further confirming that the diffusion section can redistribute the light irradiated to the end of the light-emitting section to the beginning of the light-emitting section in the background art.
The rule can be summarized by the experiment, and in order to avoid the overlarge illumination intensity of the initial segment of the light-emitting segment and ensure the uniform illumination intensity of the exciting light of the light-emitting segment, the length of the diffusion segment should be at least smaller than that of the light-emitting segment. Further, the length of the diffusion section is not less than 1/3 of the light emitting section to change the light distribution of the excitation light by a sufficient amount.
In this embodiment, the light guide 220 may be a transparent glass rod, and may also be transparent sapphire, quartz glass, or the like. The shape of the light guide 220 may be a cylindrical, prismatic, or the like structure.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a light source device according to a second embodiment of the present invention. The light source device 30 includes a laser light source 310, a light conductor 320, and a wavelength conversion layer 330. The light guide body 320 includes an incident end 324, a diffusion section 322, a light emitting section 321, and an end 323, the first diffuse reflection structure 340 is disposed on an outer surface of the light guide body of the diffusion section 322, and the wavelength conversion layer 330 is disposed on an outer surface of the light emitting section 321.
First, unlike the first embodiment shown in fig. 2, the tip 323 of the optical conductor 320 of the second embodiment includes not only the bottom end surface of the optical conductor 320 but also a portion extending along the optical conductor near the bottom end surface. A second diffuse reflecting structure 350 covers the outer surface of the end 323 and appears as a "concave" shape in cross-section along the optical axis of the light conductor as shown. In a modified embodiment of this embodiment, the reflective structure with the end covering the outer surface of the wall of the optical waveguide is replaced by a specular reflective structure, and the light distribution conversion is mainly realized by means of the diffuse reflective structure at the bottom end face of the optical waveguide.
Next, the end 323 of the optical conductor 320 of the second embodiment is sleeved with a heat sink 360. The tail end is lengthened relative to the first embodiment, so that the size of the second diffuse reflection structure is increased, the light distributed by the converted light is increased, and the tail end of the light conductor 320 is provided with a space sleeved with the radiator 360, so that heat emitted by the wavelength conversion layer can be respectively transmitted to the downstream of the light path, the heat dissipation effect is improved, and the service life of the product is prolonged. In this embodiment, the heat sink 360 is opaque, ensuring light safety in the event of a fracture or detachment of the second diffuse reflecting structure.
In addition, the light guide body 320 of the present embodiment further includes a heat dissipation section 325, and the heat dissipation section 325 is close to the incident end 324 of the light guide body with respect to the diffusion section 322. The periphery of the heat dissipation section 325 is provided with a heat dissipation structure 370, which may include a heat dissipation fin or a heat dissipation column. The heat dissipation structure 370 is connected to the light conductor 320 through the transparent heat conductive adhesive layer 371, and the refractive index of the transparent heat conductive adhesive layer 371 is smaller than that of the light conductor 320 to satisfy the total reflection. The heat-conducting glue can be UV glue, EPOXY heat-curing glue and the like.
The present embodiment improves the heat dissipation efficiency by providing the heat dissipation section 325.
For the features, effects, and variations of other devices in this embodiment, please refer to the description of the first embodiment, which is not repeated herein.
Fig. 7 is a schematic structural diagram of a light source device according to a third embodiment of the invention. The light source device 40 includes a laser light source 410, a light conductor 420, and a wavelength conversion layer 430.
The difference between the present embodiment and the first embodiment is mainly that the light guide 420 in the present embodiment is a hollow light guide. The light propagates in the core of the light conductor 420 by means of the reflective structure of the tube wall instead of total reflection.
In the present embodiment, the first diffuse reflection structure 440 is disposed on the inner surface of the diffusion section of the light guide body 420, and the wavelength conversion layer 430 is disposed on the inner surface of the light emitting section of the light guide body 420. The first diffuse reflection structure 440 is a surface concave-convex microstructure in this embodiment, and it can be understood that, in the modified embodiment of this embodiment, it may be replaced with a diffuse reflection layer.
In a modified embodiment of this embodiment, the first diffuse reflection structure may also be provided on the outer surface of the light guide body diffusion section, the wavelength conversion layer may also be provided on the outer surface of the light emitting section or on both the inner and outer surfaces.
It is understood that the present embodiment may also include the terminal heat spreader and the heat dissipation section in the above embodiments, and the functions of each device may also refer to the description of the above embodiments, which is not described herein again.
Fig. 8 is a schematic structural diagram of a light source device according to a fourth embodiment of the invention. The light source device 50 includes a laser light source 510, a light conductor 520, and a wavelength conversion layer 530. Light conductor 520 is disposed on the outgoing light path of laser light source 510, and includes a diffusion section and a light emitting section sequentially disposed along the transmission direction of the excitation light, and the diffusion section is provided with a first diffuse reflection structure 540.
Unlike the above embodiments, the first diffuse reflection structure 540 in the present embodiment is provided in the inner space of the light guide body. This technical solution changes the light distribution of the excitation light that entirely passes through the diffusion section, rather than changing only a portion, and the excitation light that passes through the diffusion section and is not incident to the light emitting section is reflected by the second diffuse reflection structure 550 disposed at the end.
According to the technical scheme, the light originally irradiated on the light emitting section is directly changed in light distribution, the quantity of large-angle exciting light is increased, and therefore the uniformity of the illuminance of the exciting light of the light emitting section is improved.
The disadvantage of this embodiment over the above embodiments is that backscattering and thus light losses are caused, and that almost all excitation light is affected, increasing scattering losses, and also taking into account the problem of transmission. Under the condition of not high requirement on the problems, the technical scheme of the embodiment can be adopted.
The present embodiment is also different from the above-described embodiments in that the laser light source 510 includes two light emitting elements 511 and 512. The two light-emitting elements may emit light of different wavelengths to accommodate lighting requirements, such as correction of color coordinates.
It is to be understood that the laser light source in each of the above embodiments may also include two or more light emitting elements, these light emitting elements may be the same light emitting element, or light emitting elements with different wavelengths, and those skilled in the art may select the kind and number of the light emitting elements according to actual needs.
Fig. 9 is a schematic structural diagram of a light source device according to a fifth embodiment of the invention. The light source device 60 includes a laser light source 610, a light guide 620, a wavelength conversion layer 630, a first diffuse reflection structure 640, and a heat dissipation structure 670. The light guide body 620 includes a diffusion section 622, a light emitting section 621, and a heat dissipation section 625.
The present embodiment is a modified embodiment of the embodiment shown in fig. 6, and the main difference is that the heat dissipation section 625 covers the diffusion section 622, and the heat dissipation structure 670 disposed on the heat dissipation section 625 is surrounded on the periphery of the first diffuse reflection structure 640.
Please refer to the description of the above embodiments for the structure and function of other elements in the fifth embodiment, which is not repeated herein.
The present invention also claims a vehicular lamp comprising the light source device in any of the above embodiments, and further comprising a light collecting device, wherein the wavelength converting layer in the light source device is disposed at a focal position of the light collecting device. The light collecting device can be a lens, a curved reflector and the like.
The invention also discloses a bulb which adopts the light source device in each embodiment mode as a light source lamp wick.
The invention also discloses a lamp tube, which adopts the light source device in each embodiment mode as a light source tube core.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
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 (14)
1. A light source device, comprising:
a laser light source for emitting excitation light;
the light guide body is arranged on an emergent light path of the laser light source and used for transmitting the exciting light, the light guide body comprises a diffusion section and a light emitting section, the diffusion section and the light emitting section are sequentially arranged along the transmitting direction of the exciting light, the diffusion section is provided with a first diffuse reflection structure, and the first diffuse reflection structure is arranged on the outer surface of the diffusion section of the light guide body, so that the light distribution of a part of the exciting light is changed by the diffusion section, and the other part of the exciting light directly sweeps the diffusion section and enters the light emitting section;
and the wavelength conversion layer is arranged on the surface of the light emitting section of the light guide body, and can absorb exciting light and emit stimulated light with the wavelength different from that of the exciting light.
2. The light source device according to claim 1, wherein the optical waveguide is a solid optical waveguide, and the wavelength conversion layer is provided on an outer surface of a light emitting section of the optical waveguide.
3. The light source device according to claim 2, wherein the diffusion section is disposed adjacent to the light emitting section.
4. The light source device according to claim 3, wherein the diffusion section has a length smaller than that of the light emitting section.
5. The light source device according to claim 1, wherein the light guide is a hollow light guide, and the wavelength conversion layer is provided on an inner surface and/or an outer surface of a light emitting section of the light guide.
6. The light source device according to claim 1, wherein the wavelength conversion layer comprises at least one of a fluorescent resin, a fluorescent silica gel, a fluorescent glass, a fluorescent ceramic, or a fluorescent single crystal.
7. The light source device of claim 6, wherein the wavelength conversion layer comprises at least two fluorescent materials, and the at least two fluorescent materials are mixed, layered, or regionally arranged.
8. A light source device according to claim 1, wherein said light guide further comprises a tip located in the light path downstream of said light emitting section, said tip being provided with a second diffuse reflecting structure.
9. The apparatus according to claim 8, wherein the second diffuse reflection structure has a diffuse reflection angle smaller than that of the first diffuse reflection structure.
10. The apparatus according to claim 9, wherein the second diffuse reflection structure is a gaussian reflection structure, and the first diffuse reflection structure is a lambertian reflection structure.
11. The light source device of claim 8, further comprising a heat sink disposed at an end of the light conductor, wherein the heat sink is opaque to light.
12. The light source device according to claim 1, wherein the optical waveguide further includes a heat radiation section which is close to the incident end of the optical waveguide with respect to the diffusion section, and a periphery of the heat radiation section of the optical waveguide is provided with a heat radiation structure.
13. The light source device according to claim 1, wherein the laser light source includes light emitting elements of at least two wavelengths.
14. A vehicular lamp comprising the light source device according to any one of claims 1 to 13, further comprising a light collecting device, the wavelength converting layer being disposed at a focal position of the light collecting device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811075945.4A CN110906272B (en) | 2018-09-14 | 2018-09-14 | Light source device and car light |
| PCT/CN2019/100480 WO2020052399A1 (en) | 2018-09-14 | 2019-08-14 | Light source device and vehicle lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811075945.4A CN110906272B (en) | 2018-09-14 | 2018-09-14 | Light source device and car light |
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| CN110906272A CN110906272A (en) | 2020-03-24 |
| CN110906272B true CN110906272B (en) | 2021-11-16 |
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| CN201811075945.4A Active CN110906272B (en) | 2018-09-14 | 2018-09-14 | Light source device and car light |
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| WO (1) | WO2020052399A1 (en) |
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Also Published As
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| CN110906272A (en) | 2020-03-24 |
| WO2020052399A1 (en) | 2020-03-19 |
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Denomination of invention: A light source device and lamp Effective date of registration: 20220630 Granted publication date: 20211116 Pledgee: Shenzhen hi tech investment small loan Co.,Ltd. Pledgor: YLX Inc. Registration number: Y2022980009522 |