CN114110524B

CN114110524B - Light source device and car lamp

Info

Publication number: CN114110524B
Application number: CN202111339745.7A
Authority: CN
Inventors: 陈彬; 李屹
Original assignee: YLX Inc
Current assignee: YLX Inc
Priority date: 2018-06-27
Filing date: 2018-06-27
Publication date: 2023-12-22
Anticipated expiration: 2038-06-27
Also published as: CN110645541B; WO2020001055A1; CN110645541A; CN114110524A

Abstract

The invention protects a light source device, which comprises an excitation light source, a light source module and a light source module, wherein the excitation light source is used for emitting excitation light; the light pipe comprises an inner pipe wall surface, an outer pipe wall surface, an incident end surface and a bottom end surface, wherein the incident end surface is opposite to the bottom end surface and is connected with the inner pipe wall surface and the outer pipe wall surface; the light-emitting body is arranged on the pipe wall of the light pipe, can absorb excitation light and emit laser light, and the surface of the light-emitting body, which is close to the light pipe, is a light incident surface; the radiator is arranged on one side of the light pipe, far away from the illuminant, and is thermally coupled with the light pipe; excitation light emitted by the excitation light source enters from the incident end face of the light pipe, is conducted in the light pipe, and enters the light emitting body from the light incident face of the light emitting body; a heat conducting medium is arranged between the light pipe and the heat radiating body. According to the invention, the original light guide and heat conduction functions of the light guide are separated, the tube wall of the independent light guide tube is responsible for light guide, and the independent heat dissipation body is responsible for heat conduction, so that the problem of high cost of selecting the light guide with high heat conduction and high light guide performance is avoided, and the light homogenizing can be realized with a shorter transmission distance.

Description

Light source device and car lamp

Technical Field

The present invention relates to the field of lighting technology, and in particular, to a light source device and a vehicle lamp.

Background

With the increasing demand for illumination brightness, solid state light sources are becoming increasingly popular in the industry. The existing LED illumination gradually advances towards the combination of a plurality of light-emitting elements with high power, however, due to the characteristics of the LED, the heat dissipation problem increasingly hinders the improvement of illumination brightness with the increase of electric power and the densification of the light-emitting elements.

The laser diode belonging to the solid-state light source has the advantages of high light-emitting brightness, long irradiation distance and the like under large current, and white light is usually obtained by exciting fluorescent powder through the laser diode. By separating the laser light source from the fluorescent luminescent material, the superposition of heat generated by the laser light source and the fluorescent luminescent material is avoided, so that the brightness of the whole light source is further improved, and the fluorescent light source is an accepted technical scheme in the industry.

However, with the further demands for brightness of the light, the heat dissipation of the fluorescent light-emitting material is becoming a problem in the industry. For this reason, research has been focused by those skilled in the art on finding materials that have both good light guiding properties and good heat conducting properties, but it is envisioned that even if such materials are developed, the material cost problem cannot be solved in a short period of time. Therefore, a simple and economical light emitting structure is highly demanded.

Disclosure of Invention

Aiming at the defects of high cost and difficult heat dissipation in the prior art, the invention provides a light source device with low cost and good heat dissipation, which comprises: the excitation light source is used for emitting excitation light; the light pipe comprises an inner pipe wall surface, an outer pipe wall surface, an incident end surface and a bottom end surface, wherein the incident end surface is opposite to the bottom end surface, and the incident end surface is connected with the inner pipe wall surface and the outer pipe wall surface; the light emitting body is arranged on the inner pipe wall surface or the outer pipe wall surface of the light pipe, can absorb excitation light and emit laser light, and the surface, close to the light pipe, of the light emitting body is a light incident surface; the heat radiation body is arranged on one side, far away from the luminous body, of the light pipe, and is thermally coupled with the light pipe; the excitation light emitted by the excitation light source is incident on the light pipe from the incident end face of the light pipe, is conducted in the light pipe, and then is incident on the luminous body from the light incident face of the luminous body.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the light guide between the excitation light source and the luminous body is arranged as the light guide pipe, so that the excitation light is incident and conducted between the inner pipe wall surface and the outer pipe wall surface (namely, in the pipe wall) of the light guide pipe, and the radiating body can be arranged on the other pipe wall surface no matter the luminous body is arranged on the inner pipe wall surface or the outer pipe wall surface of the light guide pipe, so that the heat generated by the luminous body is radiated. The invention separates the light guiding and heat conducting functions of the original light guide, takes charge of light guiding by the pipe wall of the independent light guide pipe and takes charge of heat conducting by the independent heat radiating body, thereby avoiding the problem of high cost of selecting the light guide with high heat conducting and high light guiding performance.

Meanwhile, by conducting excitation light in the pipe wall of the light pipe, each reflection distance of light rays when conducted in the light pipe is reduced, and light homogenization is realized at a shorter distance under the condition of the same outer pipe diameter of the light pipe; alternatively, the present invention achieves a more uniform outgoing light distribution at the same light pipe dimensions as compared to light pipes or solid light bars that guide light within the die (i.e., within the inner pipe wall). Compared with a flat light guide, the light guide tube conducts light conduction in two dimension directions, reduces the comprehensive volume of the light guide, and can realize uniform light with shorter transmission distance.

In the present invention, the actual light guiding structure of the light pipe is a pipe wall rather than a tube core, and the pipe wall of the light pipe can be various structures. For example, the cross-section of the light pipe may be a closed ring (e.g., circular ring, square ring, polygonal ring, etc.), and the excitation light is reflected back and forth within the closed ring on the one hand to fill the entire closed ring within the cross-section, and propagates axially along the light pipe on the other hand; the cross section of the light pipe can also be a split ring (such as a circular arc ring and the like), and in the cross section, the split ring is filled with the excitation light in multiple reflection and is reflected at the two tail ends of the split ring, so that the light beam is prevented from leaking.

In one embodiment, further, the length of the light pipe is greater than the length of the illuminant along the axial direction of the light pipe, and the illuminant is remote from the incident end face of the light pipe. According to the embodiment, the excitation light is transmitted by a certain distance before reaching the illuminant, and uniformly reaches the whole cross section of the light guide pipe, so that uniform illuminance of the light beam at each position where the light beam reaches the illuminant is ensured, and the problem of heat generation caused by overhigh local excitation light power density of the illuminant due to the fact that the light beam enters the illuminant too early is avoided.

In one embodiment, the illuminant is disposed on an outer tube wall of the light pipe, and the heat sink is disposed on a tube core of the light pipe. On the one hand, the embodiment ensures that the light emitted by the luminous body does not need to pass through the light pipe, which is beneficial to the direct emergent light of the luminous body, and the luminous body with the same quantity is thinner; on the other hand, the heat radiation body can be concentrated on the core part of the light guide pipe, and a wider heat radiation channel is provided, so that the rapid heat conduction is facilitated.

In one embodiment, further, the luminous body does not completely cover the light pipe in the circumferential direction of the light pipe in at least a partial region of the light pipe. In this embodiment, the outer tube wall surface of the light pipe not covering the light emitting body is a total reflection surface or is provided with a reflection layer/reflection structure. This embodiment enables the light beam to exit with directivity toward a certain direction.

In one embodiment, further, the circumferential angle at which the light emitters cover the light pipe at different locations along the light pipe does not monotonically decrease with increasing distance from the incident end face of the light pipe. In this embodiment, along with the incident end surface far away from the light pipe, the light emitters covered on the light pipe are gradually increased or unchanged, so that more light can reach the light emitters at the far positions, which is beneficial to improving the light emission uniformity of the light emitters.

In one embodiment, the light exit surface of the light emitter is disposed opposite the light entrance surface.

In one embodiment, the light emitting surface of the light emitter is disposed adjacent to the light incident surface, and the area of the light emitting surface is smaller than the area of the light incident surface. In this embodiment, the excitation light homogenized by the light pipe is incident on the light incident surface of the illuminant in a larger area (i.e. smaller excitation light power density), and then is emitted from the small-area end surface of the illuminant by the laser, so as to form the emitted light with high lumen density, which can be applied to various high lumen illumination/display fields.

In one embodiment, the light emitter is disposed on the inner tube wall surface of the light pipe, the light emitter has a solid block structure, and the light emitting surface of the light emitter is disposed adjacent to the light incident surface. Unlike the aforementioned "the light emitter is outside the light pipe and the heat sink is inside the die", the present embodiment places the block-shaped light emitter on the die so that its large-area light incident surface receives the uniform, low lumen density excitation light from the light pipe and emits the high lumen density lasing light from the small-area light emitting surface of the end face. On the one hand, the local heat generation of the luminous body is reduced, the thermal quenching of the luminous body material is prevented, and on the other hand, the emergent light with high lumen density is obtained.

In one embodiment, the excitation light source comprises at least two light emitting units, the incident light spots of which on the incident end face do not coincide. Because the excitation light spot is difficult to cover the incident end face of the whole light pipe, the distribution of the incident light spot on the incident end face of the light pipe is uneven, and the cross section of the whole light pipe can be covered only by conduction of a certain distance. In this embodiment, by increasing the number of light emitting units of the excitation light source and making the light spots of different light emitting units on the incident end surface not coincide, the coverage area of the incident light spots is enlarged in advance, so that the excitation light can cover the whole light pipe cross section in a shorter distance. Preferably, the light spot positions of the light emitting units on the incident end face of the light pipe are uniformly distributed in space around the axis of the light pipe.

In one embodiment, the light source device further comprises a light guiding device arranged between the excitation light source and the light pipe, the excitation light is incident on the incident end face of the light pipe through the light guiding device, and the light guiding device comprises a lens, a lens group or an optical fiber.

In one embodiment, the bottom end surface of the light pipe is provided with a reflective layer or structure. In this embodiment, by providing the reflective layer/reflective structure, the remaining excitation light reaching the bottom end face can be reflected back to the light guide for reuse, and the excitation light distribution in the light guide can be improved.

In one embodiment, the reflecting layer at the bottom end surface of the light guide tube may be a specular reflecting layer, such as an aluminum film or a silver film, or may be a dichroic sheet, such as a wavelength filter, or may be a diffuse reflecting structure, such as a diffusion sheet coated with a reflecting film, a metal reflecting substrate provided with a glass reflecting powder layer, a reflecting glue layer, or the like.

In one embodiment, the bottom end surface of the light pipe is provided with a wavelength converting material. In this embodiment, the surplus excitation light reaching the bottom surface of the light guide pipe can be emitted from the bottom surface side of the light guide pipe by the light conversion action of the wavelength conversion material of the bottom surface.

In one embodiment, a reflective layer or reflective structure is disposed between the light pipe and the heat sink. This embodiment enables light incident on the interface between the light pipe and the heat sink to be reflected back into the light pipe.

In one embodiment, the light pipe is connected with the heat radiation body through heat conducting glue. This embodiment can increase the thermal contact interface of the two and relieve the stress between the two.

In one embodiment, the heat sink comprises a heat pipe or the heat sink comprises a flowing heat conducting medium. Because the heat radiation body does not need to consider the light guide problem, in the embodiment, a heat pipe and a liquid cooling structure with higher heat radiation efficiency can be selected, and the problem of thermal quenching of the luminous body is further avoided, so that the luminous body can bear excitation light with higher power density.

In one embodiment, the heat sink includes a first heat sink portion and a second heat sink portion arranged along an axial direction of the light pipe, a dimension of the first heat sink portion along a radial direction of the light pipe is smaller than a dimension of the second heat sink portion along the radial direction of the light pipe, the heat sink is thermally coupled with the light pipe through the second heat sink portion, the first heat sink portion is not in contact with the light pipe, and the second heat sink portion is close to the light emitter with respect to the first heat sink portion. In the embodiment of the invention, the luminous body is a real heat source, and the heat radiation body is divided into the first heat radiation part and the second heat radiation part, so that the second heat radiation part close to the luminous body is used as a main heat radiation structure of the luminous body, and the first heat radiation part does not need to be in thermal contact with the light guide tube on the premise of not obviously reducing the heat radiation effect of the heat radiation body, thereby a reflecting structure is not required to be arranged between the first heat radiation part and the light guide tube, the conduction of excitation light can be realized only by virtue of the total reflection function of the inner tube wall surface of the heat guide tube, the light transmission efficiency is improved, and the cost is solved.

The invention also provides a car lamp, which comprises the light source device and a light collecting device, wherein the light collecting device is arranged on the emergent light path of the luminous body and is used for collecting and then emitting the emergent light of the luminous body.

In one embodiment, the light collecting device is at least one of a reflector, a total reflection lens and a lens group.

According to the technical scheme that the lamp, particularly the luminous body is arranged on the outer wall surface of the light guide pipe, the light shape of the filament bulb of the existing halogen lamp can be simulated through the light source device, so that the halogen lamp can be replaced simply, the brightness of the lamp is improved, the energy consumption of the lamp is reduced, and the cost for replacing the lamp is reduced.

Drawings

FIG. 1a is a schematic view of a light source device according to a comparative example of the present invention;

FIG. 1b is a cross-sectional view of a light guide and a light emitter of the light source device of FIG. 1 a;

fig. 2a is a schematic structural diagram of a light source device according to a first embodiment of the present invention;

FIG. 2b is a schematic A-A cross-sectional structure of the light source device shown in FIG. 2 a;

FIG. 2c is a schematic cross-sectional view of a light pipe according to a variation of the first embodiment of the present invention;

FIG. 2d is a schematic cross-sectional view of a light pipe according to yet another variation of the first embodiment of the present invention;

fig. 3a is a schematic structural diagram of a light source device according to a second embodiment of the present invention;

FIG. 3B is a schematic view of a B-B cross-sectional structure of the light source device shown in FIG. 3 a;

FIG. 3C is a schematic view of a cross-sectional C-C structure of the light source device shown in FIG. 3 a;

Fig. 4 is a schematic structural diagram of a light source device according to a third embodiment of the present invention;

fig. 5 is a schematic structural diagram of a light source device according to a fourth embodiment of the present invention;

fig. 6 is a schematic structural diagram of a light source device according to a fifth embodiment of the present invention;

fig. 7 is a schematic structural diagram of a light source device according to a sixth embodiment of the present invention;

fig. 8 is a schematic structural diagram of a light source device according to a seventh embodiment of the present invention;

fig. 9 is a schematic diagram of a lamp according to an embodiment of the present invention

Detailed Description

The invention is mainly characterized in that the light guide adopted by the invention adopts different previous structures, and realizes great improvement in optical and thermal aspects. Firstly, conducting light by utilizing the pipe wall of a tubular light guide instead of a pipe core, separating the light guide function and the heat conduction function of the light guide, and realizing special use; secondly, by utilizing the shape of the tubular light guide, the transmission distance of the light beam in the radial direction of the light guide is reduced, and the reflection times of the light beam are increased by shortening the average reflection distance of the light beam, so that the light beam is more quickly homogenized and spread to the whole light guide section, and the reduction of the length dimension of the light guide and the improvement of the uniformity of excitation light are facilitated.

Referring to fig. 1a and 1b, fig. 1a is a schematic structural view of a light source device according to a pair of embodiments of the present invention, and fig. 1b is a cross-sectional view of a light guide and a light emitter of the light source device shown in fig. 1 a. The light source device comprises an excitation light source 1, a light guide 2 and a luminous body 3, wherein the light guide 2 is a solid light guide rod, and the luminous body 3 is circumferentially covered on the surface of the light guide 2. The excitation light emitted from the excitation light source 1 is incident on the incident end face of the light guide 2 along the axial direction of the light guide 2, is uniformly distributed by the light guide 2, and then is incident on the light incident face of the light emitter 3, that is, the face of the light emitter 3 contacting the light guide 2.

In this comparative example, the light emitter 3 absorbs excitation light and emits lasing light, and energy loss inevitably occurs in the conversion process due to stokes shift, and the lost energy is converted into heat energy, so that the light emitter 3 is the most dominant heat source. The light guide 2 is used as a light homogenizing device for converting the incident excitation light with high lumen density into light with large area and low energy density; on the other hand, as a heat sink, heat emitted from the light emitter 3 is conducted and dissipated. The functional requirements of the light guide 2 lead to the need to select a material with a low light absorption and a high thermal conductivity.

In addition, in this comparative example, the incident excitation light propagates by reflection in the light guide 2, forming a uniform distribution by multiple reflections. When the incident excitation light is reflected within the light guide 2 for a limited number of times after the dimensioning of the light emitters 3, when the position of the incident spot of light incident on the light guide 2 deviates from the center of the light guide 2 (i.e. the spatial distribution of the incident light is non-uniform), insufficient reflection times will result in a non-uniform distribution of the excitation light within the light guide, which in turn affects the spatial uniformity of the outgoing light of the light emitters 3. Thus, after the light emitters are sized, the light guide needs to be as long as possible to achieve uniformity of light.

Unlike the comparative example, the light source device of the present invention includes an independent excitation light source, a light pipe, a light emitter and a radiator, wherein the excitation light emitted from the excitation light source is homogenized through the light pipe and then enters the light emitter from the light incident surface of the light emitter; the luminous body absorbs the excitation light and emits laser light, and simultaneously generates heat, and the heat enters the heat radiation body through the light guide pipe and is conducted and radiated by the heat radiation body. The respective devices of the light source apparatus are described in detail below.

< excitation light Source >

The excitation light source is used for emitting excitation light, and converts electric energy into light energy. In the invention, the excitation light source is used for providing at least part of excitation light for the luminophor to absorb and then emit the excited light, and the final excited light or the combination of the excited light and the rest excitation light is the output light of the light source device which is wanted.

The excitation light source can be a solid-state light source, such as an LED light source or an LD (Laser Diode) light source of a semiconductor light-emitting technology, and the light source has high light-emitting efficiency, is energy-saving and environment-friendly. Especially, the light-emitting efficiency of the laser diode light source under large current is far higher than that of an LED, and the divergence angle of emergent light is small, so that the emergent light can enter the light guide tube after being collected.

The excitation light source may have only a single light emitting unit or may have two or more light emitting units. When the excitation light source comprises more than two light emitting units, the light emitting units can be combined into a beam of light to be incident into the light guide tube in a light combining mode.

In another technical scheme, different light emitting units are incident into the light pipe at different positions, namely, incident light spots of the different light emitting units on the incident end face of the light pipe are not overlapped. It will be appreciated that when the incident light spot of the light pipe is able to cover the entire incident end face, a uniform light distribution will be obtained at the shortest distance, but if the incident light spot is to cover the entire incident end face, the incident light spot is to be made larger than the incident end face, resulting in light loss. Therefore, the technical scheme is balanced, and the light is incident at different positions by utilizing different light emitting units, so that the total incident light spot area of the incident end face is enlarged on the premise of not exceeding the incident end face of the light guide pipe, and the excitation light can realize uniform light at a shorter distance. In a preferred embodiment, the incident light spots of each light emitting unit on the incident end face of the light pipe are uniformly distributed in space around the axis of the light pipe, so that the light uniformity performance can be further improved.

< light pipe >

The light pipe is used for receiving the excitation light from the excitation light source, homogenizing the excitation light through multiple reflections, and then conducting the excitation light to a light incidence surface of the luminous body, wherein the surface, close to the light pipe, of the luminous body is the light incidence surface. The excitation light is conducted in the pipe wall of the light pipe, the light pipe comprises an inner pipe wall surface, an outer pipe wall surface, an incident end surface and a bottom end surface, wherein the incident end surface and the bottom end surface are oppositely arranged, and the incident end surface is respectively connected with the inner pipe wall surface and the outer pipe wall surface. The excitation light is reflected on the outer tube wall surface and the inner tube wall surface.

The present invention is not limited to a specific shape of the light pipe. For example, the light pipe may be a round pipe or a square pipe, and at this time, the cross section of the light pipe is a circular ring and a square ring, the outer ring corresponds to the outer pipe wall surface, and the inner ring corresponds to the inner pipe wall surface. Of course, the cross section of the light pipe can be a closed ring with other shapes, such as a hexagonal ring, etc. When the excitation light is incident to the incident end face of the light pipe, the light spot area of the cross section is gradually enlarged along the direction away from the incident end face until the whole cross section is full, so that the light beams are uniformly distributed in the light pipe.

In some embodiments of the present invention, the cross section of the light pipe is in the shape of an open ring, and at this time, the light pipe includes an inner pipe wall, an outer pipe wall, an incident end surface and a bottom end surface, and two side end surfaces simultaneously connecting the inner pipe wall, the outer pipe wall, the incident end surface and the bottom end surface are added, and the two side end surfaces prevent excitation light from leaking from the opening of the open ring through a light reflection function.

The light pipe has the main function of light guide, and the material is transparent material with low light absorptivity, such as glass.

In some embodiments, the light pipe is preferably made of a material with a high refractive index, for example, a material with a refractive index greater than 1.8, and the technical solution can use the principle of total reflection to make excitation light conduct efficiently in the light pipe.

In other embodiments, the light pipe does not utilize the principle of total reflection, but rather, a reflective layer is disposed on the wall surface of the light pipe, which can also achieve the function of light conduction.

In some embodiments of the present invention, in order to avoid that the excitation light is not completely absorbed at the bottom end surface, a reflective layer or a reflective structure is disposed at the bottom end surface, and by using the reflective layer/reflective structure, the residual excitation light reaching the bottom end surface is reflected to reuse the light pipe, and the light distribution of the excitation light in the light pipe along the length direction of the light pipe is improved to a certain extent. Specifically, the reflecting layer may be a specular reflecting layer, such as an aluminum film or a silver film, or may be a dichroic sheet, such as a wavelength filter, or may be a diffuse reflecting structure, such as a diffusion sheet coated with a reflecting film, a metal reflecting substrate provided with a glass reflecting powder layer, a reflecting glue layer, or the like.

In order to avoid the leakage of the excitation light propagating in the light pipe at the bottom end surface, a wavelength conversion material can be arranged at the bottom end surface of the light pipe, so that the residual excitation light reaching the bottom end surface of the light pipe can also exit from one side of the bottom end surface of the light pipe through the light conversion effect of the wavelength conversion material of the bottom end surface, thereby improving the light safety.

In order to increase the efficiency of the excitation light incident on the light guide, an antireflection film may be provided on the incident end face of the light guide to improve light transmittance.

In order to prevent the excitation light from leaking from the incident end face after being reflected in the light guide pipe, an angle selection film may be provided at the incident end face so that the excitation light of a preset incident angle is transmitted, while the light of other incident angles is reflected. Other filter films may also be selected to achieve various dichroic functions.

< illuminant >

The light-emitting body can absorb excitation light and emit laser light having different wavelengths. The light-emitting body can be a fluorescent layer formed by fluorescent powder and an adhesive, such as an organic fluorescent powder layer bonded by silica gel/resin and a fluorescent glass layer bonded by glass powder, wherein the silica gel, the resin and the glass powder serve as the adhesive. The light emitter may also be a quantum dot film.

The luminous body can also be fluorescent ceramics, such as pure-phase fluorescent ceramics and complex-phase fluorescent ceramics.

The pure-phase fluorescent ceramic can be various oxide ceramic, nitride ceramic or oxynitride ceramic, and the luminescent center is formed by doping trace amount of activator element (such as lanthanide element) in the ceramic preparation process. Because of the small doping levels of typical activator elements (typically less than 1%), such fluorescent ceramics are typically transparent or translucent luminescent ceramics. In one embodiment of the invention, the luminescent ceramic layer is a Ce doped YAG ceramic; in another embodiment of the invention, the luminescent ceramic layer is a Ce doped LuAG ceramic.

Generally, the pure-phase fluorescent ceramic has a polycrystalline structure, and in some embodiments of the invention, the luminescent body can also be a fluorescent single crystal, the fluorescent single crystal has better light transmission performance, is generally colored and transparent, has high thermal conductivity, and can generate total reflection on the surface.

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. Transparent/translucent ceramic matrixCan be various oxide ceramics (such as alumina ceramics, Y ₃ Al ₅ O ₁₂ Ceramic), nitride ceramic (e.g., aluminum nitride ceramic), or oxynitride ceramic, the ceramic matrix functions to conduct light and heat so that excitation light can be incident on the fluorescent ceramic particles and so that the laser light can be emitted from the complex-phase fluorescent ceramic; the fluorescent ceramic particles play a main light-emitting function of fluorescent ceramics for absorbing excitation light and converting it into laser 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 matrix, so that the condition that the fluorescent ceramic particles positioned at the deeper position of the fluorescent ceramic cannot be irradiated by excitation light is avoided, and the condition that the concentration of an activator element is poisoned due to the fact that the whole doping amount of the pure-phase fluorescent ceramic is large is avoided, and the luminous efficiency of the fluorescent ceramic is improved.

In an embodiment of the present invention, scattering particles may be further added to each of the above-described light emitters, so that the scattering particles are distributed in the light emitters. The scattering particles have the effect of enhancing the scattering of the excitation light in the luminescent ceramic layer, thereby increasing the optical path of the excitation light in the luminescent body, greatly improving the light utilization rate of the excitation light and improving the light conversion efficiency. The scattering particles can be scattering particles such as alumina, yttria, zirconia, lanthanum oxide, titanium oxide, zinc oxide, barium sulfate and the like, can be single material scattering particles or can be a combination of two or more materials, and are characterized by apparent white color, can scatter visible light, is stable in material, can bear high temperature, and has particle size in the same order of magnitude or an order of magnitude lower than the wavelength of excitation light. In other embodiments, the scattering particles may be replaced with air holes of the same size, and the difference in refractive index between the air holes and the matrix or binder is used to achieve total reflection, so as to scatter excitation light or laser 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 itself has an activator, and can emit laser under the irradiation of excitation light. According to the technical scheme, the advantages of high luminous efficiency of the luminous ceramic particles of the complex-phase fluorescent ceramic and the advantages of luminous performance of the pure-phase fluorescent ceramic are combined, meanwhile, the luminous efficiency is further improved by utilizing the luminous ceramic particles and the fluorescent ceramic matrix to emit light, and the ceramic matrix has a certain doping amount of an activating agent, but has a lower doping amount, so that the ceramic matrix can be ensured to have enough light transmittance. In the light emitter, scattering particles or air holes can be added to enhance internal scattering.

The luminescent material (for example, phosphor) in the luminescent body 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 luminous body is not limited to uniform distribution, but may be non-uniform distribution such as gradient distribution.

In the present invention, the light emitting body is provided on the light pipe, either on the outer pipe wall surface or on the inner pipe wall surface of the light pipe.

The length of the light emitters, whether they are disposed on the outer or inner tube walls of the light pipe, is preferably less than the length of the light pipe. This is because the excitation light from the excitation light source cannot be uniformly formed upon entering the light pipe, and needs to be conducted and reflected over a certain distance to fill the cross section of the light pipe before being uniform. Therefore, in some preferred embodiments of the present invention, the length of the light pipe is made longer than the length of the illuminant, and the illuminant is far away from the incident end surface of the light pipe, so that the excitation light has a sufficient distance to achieve uniform light. Of course, the present invention does not exclude that in some embodiments, part uniformity is sacrificed such that the illuminant length is equal to the light pipe length, even if the illuminant length is greater than the light pipe length. For a light emitter that extends beyond the length of the light pipe, conduction can be achieved by total reflection or reflection of excitation light at the surface of the light emitter. In addition, even if the length of the luminous body is smaller than that of the light pipe, part of the luminous body can exceed the length range of the light pipe, and the luminous body of the part of luminous body is arranged in a suspended mode relative to the light pipe.

When the illuminant is arranged on the outer tube wall surface of the light pipe, the radiator is arranged at the tube core position of the light pipe, and the excitation light in the light pipe enters the illuminant through the outer tube wall surface optically coupled with the light incident surface of the illuminant. In the technical scheme, the light emitted by the luminous body does not need to be emitted through the light pipe, which is beneficial to the direct emission of the emitted light of the luminous body, and for the same light pipe and the same quantity of luminous bodies, the scheme has thinner luminous bodies than the scheme that the luminous bodies are arranged on the inner pipe wall surface of the light pipe; on the other hand, the technical scheme ensures that the heat radiation body is concentrated on the core part of the light guide pipe, has wider heat radiation channels and is beneficial to the rapid export of heat.

When the luminous body is arranged on the inner pipe wall surface of the light pipe, the luminous body is of a solid block structure, namely, the luminous body is arranged on the pipe core of the light pipe. In this technical solution, the light emitted by the light emitter is difficult to exit through the light pipe, so in one embodiment, the light exit surface of the light emitter is disposed adjacent to the light entrance surface, and the light exit direction of the light exit surface of the light emitter is along the length direction of the light pipe. The excitation light after being homogenized by the light pipe is incident around the luminous body in a large area and is absorbed by the luminous body with lower luminous density, so that the heat generation uniformity is improved, and the material thermal quenching caused by local overheating can not occur; and finally, the emergent light is emergent from the end face of the luminous body, the luminous area is small, the brightness is high, and the emergent light with high lumen density is obtained.

In the scheme that the outer tube wall of the light pipe covers the luminous body, for the part of the tube wall of the light pipe covering the luminous body, the luminous body can completely cover the tube wall surface of the light pipe along the circumferential direction of the light pipe, and then the luminous body can emit light in all circumferential directions. In other embodiments, the light emitters do not completely cover the light pipe in the circumferential direction of the light pipe in at least a partial region of the light pipe, which limits the light emission direction of the light emitters.

Further, the circumferential angle at which the illuminant covers the light pipe varies at different locations along the length of the light pipe. In particular, in one scheme, the circumferential angle of the illuminant covering the light pipe is monotonically not reduced along with the increase of the distance from the incident end face of the light pipe.

In the present invention, the light emitting surface of the light emitting body may be the opposite surface to the light incident surface thereof, or may be the adjacent surface to the light incident surface. In the technical scheme that the luminous body is arranged on the inner pipe wall surface of the light pipe, the luminous body has no light emergent surface opposite to the light incident surface, and only the adjacent surface of the light incident surface can be used as the light emergent surface, namely the end surface of the luminous body. In the technical scheme that the luminous body is arranged on the outer pipe wall surface of the light pipe, the light emergent surface of the luminous body can be a surface which is similar to the area of the light incident surface, and can also be an adjacent surface with smaller area. When a linear or planar illumination light source having a large area is required, a surface disposed opposite to the light incident surface is selected as the light emitting surface. When a small area light source of high lumen density is required, the adjacent face of the light entrance face is selected as the light exit face. Of course, the opposite surface and the adjacent surface of the light incident surface may be made the light emitting surface of the light emitter at the same time.

In the invention, the light emitting surface of the luminous body can be added with an optical film to obtain light with specific optical characteristics. For example, by providing a wavelength filter film, only light in a certain wavelength range is transmitted to obtain outgoing light with high color purity, or by reflecting excitation light, the light utilization ratio of the excitation light is improved. An analyzer diaphragm may also be provided to obtain light of a single polarization state. An angle selection film can also be arranged to obtain emergent light with a small divergence angle.

< radiator >

The heat radiator is used for conducting and radiating heat emitted by the luminous body. The heat radiation body is contacted with the light guide pipe and is positioned on the wall surface of one side of the light guide pipe far away from the luminous body, so that heat emitted by the luminous body firstly passes through the pipe wall of the light guide pipe and then is conducted to the heat radiation body.

The heat sink may be any known heat sink structure, such as a metal heat sink. In one aspect, the heat sink includes a heat pipe. In one embodiment, the heat sink comprises a flowing heat conducting medium. Because the heat radiation body does not need to consider the light guide problem, in the embodiment, a heat pipe and a liquid cooling structure with higher heat radiation efficiency can be selected, and the problem of thermal quenching of the luminous body is further avoided, so that the luminous body can bear excitation light with higher power density.

In order to prevent the contact between the heat sink and the light pipe from affecting the optical performance of the light pipe, a reflective layer or a reflective structure, such as a plated reflective film, may be provided between the light pipe and the heat sink.

Because most of the heat radiating bodies are metal, the light guide pipe is glass or ceramic, and the thermal expansion coefficients of the light guide pipe and the heat radiating bodies are greatly different, and in order to eliminate stress and ensure the thermal contact area of the light guide pipe and the heat radiating bodies, a heat conducting adhesive for connection can be arranged between the light guide pipe and the heat radiating bodies.

The structure of the radiator can be improved to realize the improvement of volume and cost. In the technical scheme that the heat radiator is arranged on the tube core of the light pipe, the heat radiator comprises a first heat radiating part and a second heat radiating part which are arranged along the axis of the light pipe, the radial dimension of the first heat radiating part along the light pipe is smaller than that of the second heat radiating part along the light pipe, the heat radiator is thermally coupled with the light pipe through the second heat radiating part, the first heat radiating part is not contacted with the light pipe, and the second heat radiating part is close to the luminous body relative to the first heat radiating part (preferably, the projection of the second heat radiating part on the light pipe is overlapped with the projection of the luminous body on the light pipe). According to the technical scheme, unnecessary heat dissipation structures can be reduced, so that the heat dissipation bodies can dissipate heat of the luminous bodies in a targeted manner, and the cost is reduced.

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

Referring to fig. 2a, fig. 2a is a schematic structural diagram of a light source device according to a first embodiment of the invention. The light source device 10 includes an excitation light source 110, a light pipe 120, a light emitter 130, and a heat sink 140.

The excitation light source 110 is used for emitting excitation light. As described above, it may be an LED, a laser diode light source, or the like.

In this embodiment, the light pipe 120 is a circular pipe, and includes an outer pipe wall 121, an inner pipe wall 122, an incident end 123 and a bottom end 124, where the incident end 123 connects the inner pipe wall 122 and the outer pipe wall 121.

The light emitter 130 is provided on the outer tube wall surface 121 of the light guide 120, and can absorb excitation light and emit laser light.

The heat sink 140 is disposed on one side of the inner tube wall of the light pipe 120, and is disposed on the die of the light pipe 120 and is thermally coupled to the light pipe 120.

The overall optical path is substantially that the excitation light emitted from the excitation light source 110 is incident on the light guide 120 from the incident end face 123 of the light guide 120, is conducted in the light guide 120, and then is incident on the light emitter 130 from the light incident face of the light emitter 130 (i.e., the contact face between the light emitter 130 and the light guide 120), and then, at least part of the excitation light is absorbed by the light emitter 130, and is emitted as emitted light by the emitted laser light. It can be understood that the light emitted by the light emitting body 130 may be light containing only the laser light, or may be light containing the laser light and the non-absorbed excitation light, which is designed according to the actual needs and will not be described herein.

For further clarity in describing the structure of the light pipe 120, please refer to fig. 2b, fig. 2b is a schematic A-A cross-sectional structure of the light source device shown in fig. 2 a. In fig. 2b, the reference numerals are identical to those of fig. 2a, and the light emitter 130, the light guide 120 and the heat sink 140 form a layer-by-layer nested structure, wherein the light guide 120 surrounds the heat sink 140, and the light emitter 130 surrounds the light guide 120.

The shape of the light pipe of the present invention is not limited to the circular tube type shown in fig. 2b, and the cross section thereof may be other closed loop type. Fig. 2c is a schematic cross-sectional view of a light pipe according to a modification of the first embodiment of the present invention, which illustrates a light pipe 120c, a light emitting body 130c and a heat dissipating body 140c, wherein the cross-section of the light pipe 120c is a square ring. It will be appreciated that the light pipe cross-section of the present invention is not limited to circular and square rings, but may be annular in other shapes.

Moreover, the cross section of the light pipe of the present invention is not limited to a closed ring, but may be a split ring. Referring to fig. 2d, a schematic cross-sectional view of a light pipe according to another variation of the first embodiment of the present invention is shown, in which a light pipe 120d, a light emitting body 130d and a heat dissipating body 140d are shown. The cross section of the light pipe 120d is circular arc ring. In this embodiment, the light pipe 120d has two surfaces in addition to the outer pipe wall surface, the inner pipe wall surface, the incident end surface and the bottom end surface, and the two surfaces should be provided with a reflective layer or a reflective structure to prevent the light beam from leaking out. In this embodiment, since the light pipe is a non-closed pipe, the radiator provided therein may be extended from the inside of the light pipe, further improving the heat radiation performance.

Returning to fig. 2a, in the present embodiment, along the axial direction of the light pipe 120, the length of the light pipe 120 is greater than the length of the light emitter 130, and the light emitter 130 is located away from the incident end face 123 of the light pipe 120.

In this embodiment, the light incident surface of the light emitting body 130 is optically coupled to the outer tube wall surface 121 of the light guide 120, and the light emitting surface 131 of the light emitting body 130 is disposed opposite to the light incident surface. The light source device 10 of the present embodiment can thus obtain emitted light in the shape of a light-emitting rod. The light source device can replace some existing rod-shaped/linear halogen filaments.

In this embodiment, in addition to the excitation light source 110, the light pipe 120, the light emitter 130 and the heat sink 140, the light source device 10 further includes a light guiding device 150 disposed on the light path between the excitation light source 110 and the light pipe 120, and the excitation light is incident on the incident end face 123 of the light pipe 120 through the light guiding device 150. The light guiding means 150 in this embodiment is a lens. In other embodiments, the light guiding device may be an optical device such as a lens group or a light conductor. The light guide is not necessarily an optical structure, and the excitation light source may be directly incident into the light guide.

In this embodiment, the heat sink may be a metal structure with fins, a heat dissipation structure including a heat pipe, or an active heat dissipation structure, such as a refrigeration chip. As the radiator does not need to bear optical function, various light absorption, light transmission and light reflection materials can be selected without limitation. Thus, the heat sink may also be a flowing heat conducting medium, such as cooling water. In this embodiment, since the excitation light is incident on the light guide by remote irradiation, the light guide, the light emitting body, and the radiator are not electrically connected, and there is no fear of electric shock safety in the technical scheme using cooling water.

Referring to fig. 3a, fig. 3a is a schematic structural diagram of a light source device according to a second embodiment of the invention, wherein the light source device 20 includes an excitation light source 210, a light pipe 220, a light emitting body 230 and a heat sink 240. The light pipe 220 includes an inner pipe wall 222, an outer pipe wall 221, an incident end surface 223, and a bottom end surface 224, the incident end surface 223 is disposed opposite to the bottom end surface 224, the inner pipe wall 222 is disposed opposite to the outer pipe wall 221, and the incident end surface 223 connects the inner pipe wall 222 and the outer pipe wall 221. The light emitter 230 is disposed on the outer wall 221 of the light pipe 220, and is capable of absorbing the excitation light and emitting the laser light, and the radiator 240 is disposed on the inner wall side of the light pipe 220. The excitation light emitted from the excitation light source 210 is incident from the incident end surface 223 of the light pipe 220, is transmitted between the inner pipe wall surface 222 and the outer pipe wall surface 221, and then is incident from the light incident surface of the light emitter 230 to the light emitter, and the surface of the light emitter close to the light pipe is the light incident surface.

The second embodiment is different from the first embodiment shown in fig. 2a in that a heat conducting medium 250 is added between the light pipe 220 and the heat sink 240, and specifically, the heat conducting medium 250 may be a heat conducting glue. Generally, the heat sink is made of metal, the light pipe is made of inorganic nonmetallic materials such as glass, ceramic, single crystal and the like, and the two materials have different thermal expansion coefficients and are not easy to combine. This embodiment can increase the thermal contact interface between the light pipe 220 and the heat sink 240, relieving stress.

Because the refractive index of some heat-conducting glue is larger, the interface total reflection condition of the light pipe and the heat-conducting glue can be invalid, and therefore a reflecting layer or a reflecting structure can be arranged between the light pipe and the heat radiation body so as to ensure that excitation light does not leak in the light pipe.

The present embodiment also differs from the first embodiment in that at least a partial region of the light pipe 220 in the present embodiment is not covered with the light emitting body 230 in the circumferential direction of the light pipe 220 (in the present invention, the case where the covering angle is larger than 0 ° and smaller than 360 °, the case where the covering angle is not covered at all does not fall within the scope of the present embodiment).

Please refer to fig. 3B and 3C, which are schematic diagrams of the B-B cross section and the C-C cross section of the light source device 20 shown in fig. 3a, respectively. Wherein for the B-B section, the illuminant 230 covers an angular range of 180 ° only along the circumference of the light pipe 220, and for the C-C section, the illuminant 230 covers an angular range of 360 ° along the circumference of the light pipe 220.

Similar to the previous embodiments, the C-C section is not described here again. For the B-B cross-section shown in fig. 3B, the illuminant 230 emits light 180 ° from only one side of the light pipe 220, forming a specific light distribution. The B-B cross section does not cover the side of the light emitter, and the excitation light is confined within the light pipe by total reflection at the interface of the light pipe 220 and is conducted in the axial direction. It is understood that the cross-sectional angle of the illuminant 230 covering the light pipe is not limited to 180 °, but may be any angle between greater than 0 and less than 360 °.

In this embodiment, the B-B cross section is closer to the entrance end surface 223 of the light pipe 220 than the C-C cross section. The distribution of the incident initial spot in the cross-section of the light pipe 220 is extremely non-uniform, and as the beam propagates along the axis of the light pipe 220, the distribution of the spot in the cross-section gradually spreads to form a completely uniform plane distribution. Thus, the distribution of the light planes of the B-B cross-section is non-uniform with respect to the distribution of the light planes of the C-C cross-section, and the light beam is mainly concentrated on the upper side of FIG. 3 a. The illuminant 230 is also disposed on the side of the cross section near the incident spot to ensure that sufficient light is incident into the illuminant 230. In a variation of this embodiment, the circumferential angle of the illuminant covering the light pipe is not only a variation of the two cross-sections B-B and C-C, but a plurality of different covering angles. The circumferential angle at which the light emitters cover the light pipe at different locations along the light pipe does not monotonically decrease with increasing distance from the incident end face of the light pipe.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a light source device according to a third embodiment of the present invention, wherein the light source device 30 includes an excitation light source 310, a light pipe 320, a light emitting body 330, a heat sink 340 and a light guiding device 350.

The light guiding device 350 is disposed on the light path between the excitation light source 310 and the light guide 320, and guides the excitation light to the incident end face of the light guide 320. In this embodiment, the light guiding means 350 comprises an optical fiber.

The embodiment is different from the embodiment shown in fig. 2a in that the excitation light source 310 in the embodiment includes two light emitting units 311 and 312, and the light guiding device 350 guides the excitation light emitted by the two light emitting units to different positions of the incident end surface of the light guide 320 through two optical fibers, so that the incident light spots of the two light emitting units at the incident end surface do not coincide.

The light distribution uniformity of the present embodiment at the incident end face of the light pipe 320 is better than that of the light pipe 120 of the first embodiment, so that the shorter distance achieves the light distribution uniformity of the entire light pipe cross section when the excitation light is conducted in the light pipe.

In this embodiment, only the incident light spots are shown at different positions of the incident end face of the light pipe by using two light emitting units, and it can be understood that more light emitting units can be used to irradiate at different positions of the incident end face of the light pipe, so as to further improve the uniformity of light distribution of the incident end face.

In other embodiments of the present invention, the control of the position of the incident light spot is not limited to the optical fiber mode, and the excitation light may be directly guided to the incident end face by means of lens guidance or the like, which is not described herein.

The light emitting unit in this embodiment is shown to include only one laser diode, and it is understood that one light emitting unit may also include a plurality of laser diodes or light emitting diodes, which are used as one light emitting unit after being combined.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a light source device according to a fourth embodiment of the invention, wherein the light source device 40 includes an excitation light source 410, a light pipe 420, a light emitting body 430, a heat sink 440 and a light guiding device 450.

Unlike the above embodiments, in the present embodiment, the bottom end surface of the light pipe 420 is provided with the reflective layer 460. By means of these reflective layers/structures, the remaining excitation light reaching the bottom end surface is reflected to reuse the light pipe and to some extent improve the light distribution of the excitation light within the light pipe along the length of the light pipe. Specifically, the reflecting layer may be a specular reflecting layer (including planar reflection and curved reflection), such as an aluminum film and a silver film, or may be a dichroic sheet, such as a wavelength filter (reflection excitation light band), or may be a diffuse reflecting structure, such as a diffusion sheet coated with a reflecting film, a metal reflecting substrate provided with a glass reflecting powder layer, a reflecting glue layer, or the like.

In a variant of the fourth embodiment, the reflective layer 460 may be replaced by a layer structure containing a wavelength converting material, so that the residual excitation light reaching the bottom end surface of the light guide tube may also be absorbed by the light conversion effect of the wavelength converting material of the bottom end surface. In particular, the layer structure may be a layer structure comprising a wavelength converting material, a reflective material and an adhesive.

In the present invention, regardless of whether 460 is a reflective layer/reflective structure or a layer structure containing a wavelength conversion material, excitation light is prevented from leaking out of the bottom end surface, causing light safety problems.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a light source device according to a fifth embodiment of the present invention, and the light source device 60 includes an excitation light source 510, a light pipe 520, a light emitting body 530 and a heat sink 540.

Unlike the above-described embodiment, in the present embodiment, the heat sink 540 includes the first heat dissipation portion 541 and the second heat dissipation portion 542 arranged along the axial direction of the light pipe 520, wherein the size of the first heat dissipation portion 541 in the radial direction of the light pipe 520 is smaller than the size of the second heat dissipation portion 542 in the radial direction of the light pipe, the heat sink 540 is thermally coupled with the light pipe 520 through the second heat dissipation portion 542, the first heat dissipation portion 541 is not in contact with the light pipe 520, and the second heat dissipation portion 541 is close to the light emitter 530 with respect to the first heat dissipation portion 542.

As can be seen from the figure, the projection of the second heat dissipating part 542 on the light pipe 520 coincides with the projection of the illuminant 530 on the light pipe 520, so that the heat dissipating requirement can be satisfied most efficiently. It is understood that the second heat sink may be longer relative to the light emitter in the axial direction of the light pipe.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a light source device according to a sixth embodiment of the invention. The light source device 60 includes an excitation light source 610, a light pipe 620, a light emitter 630, and a heat sink 640. The light emitter 630 is disposed on the outer wall surface of the light pipe 620, and is capable of absorbing the excitation light and emitting the excited light, and the heat sink 640 is disposed on the inner wall side of the light pipe 620. The excitation light emitted from the excitation light source 610 is incident from the incident end face of the light guide 620, is transmitted between the inner tube wall face and the outer tube wall face, and then is incident from the light incident face 631 of the light emitter 630 to the light emitter 630, and the light incident face 631 of the light emitter 630 is optically coupled to the light guide 620.

Unlike the above embodiments, in the present embodiment, the light emitting surface 632 of the light emitter 630 is disposed adjacent to the light incident surface 631, instead of being disposed opposite to that in the above embodiments, and the area of the light emitting surface 632 is smaller than that of the light incident surface 631. The excitation light homogenized by the light pipe 620 is incident on the light incident surface 631 of the illuminant 630 in a larger area (i.e. smaller excitation light power density), and then is emitted from the small-area end face 632 of the illuminant by the laser, so as to form the emergent light with high lumen density, which can be applied to various high lumen illumination/display fields.

In the above examples, the embodiments in which the luminous body is on the outer tube wall surface of the light pipe are exemplified. Embodiments in which the luminous body is provided on the inner tube wall surface of the light pipe will be described below. It is understood that the technical features of the above embodiments, such as the excitation light source including a plurality of light emitting units, the type of the light guiding device, the length relationship between the light emitting body and the light pipe, the cross-sectional shape of the light pipe, the optical structure of the bottom end surface of the light pipe, and the like, may be applied to the following embodiments.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a light source device according to a seventh embodiment of the present invention, the light source device 70 includes an excitation light source 710, a light pipe 720, a light emitter 730 and a heat sink 740, the light emitter 730 is disposed on an inner wall surface of the light pipe 720, and is capable of absorbing the excitation light and emitting laser light, and the heat sink 740 is disposed on one side of an outer wall of the light pipe 720. The excitation light emitted from the excitation light source 710 is incident from the incident end face of the light guide 720, is transmitted between the inner tube wall face and the outer tube wall face, and then is incident from the light incident face 731 of the light emitter 730 to the light emitter 730, and the light incident face 731 of the light emitter 730 is optically coupled to the light guide 720.

In the present embodiment, the light emitter 730 has a solid block structure, and the light emitting surface 732 of the light emitter is disposed adjacent to the light incident surface 731. Excitation light is incident on the light incident surface 731 of the light emitter 730 in a larger area (i.e., a smaller excitation light power density), and is then emitted from the small-area end surface 732 of the light emitter by the laser light, so that an emitted light with a high lumen density is formed, which can be applied to various high lumen lighting/display fields.

The embodiment also separates the light guide and heat conduction functions of the original light guide, the tube wall of the independent light guide tube is responsible for light guide, and the independent heat radiator is responsible for heat conduction, so that the problem of high cost of selecting the light guide with high heat conduction and high light guide performance is avoided.

The invention also provides a car lamp, and referring to fig. 9, a schematic structural diagram of the car lamp according to the embodiment of the invention is provided. The vehicle lamp includes the various light source devices listed above, including an excitation light source 010, a light pipe 020, a luminous body 030, a radiator 040, and a light guide 050. The lamp also includes a light collecting device 080 provided on the light path of the light emitted from the light emitter 030, for collecting the light emitted from the light emitter 030 and emitting the collected light.

The light source device of the car lamp can simulate the light type of the filament bulb of the existing halogen car lamp, can be directly replaced in the car lamp, improves the brightness and energy consumption of the car lamp, does not need to change the light collecting device, and reduces the cost of replacing the car lamp.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The foregoing description is only of embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims

1. A light source device is characterized by comprising,

the excitation light source is used for emitting excitation light;

the light pipe comprises an inner pipe wall surface, an outer pipe wall surface, an incident end surface and a bottom end surface, wherein the incident end surface is opposite to the bottom end surface, and the incident end surface is connected with the inner pipe wall surface and the outer pipe wall surface;

the light emitting body is arranged on the inner pipe wall surface or the outer pipe wall surface of the light pipe, can absorb excitation light and emit laser light, and the surface, close to the light pipe, of the light emitting body is a light incident surface;

the heat radiation body is arranged on one side, far away from the luminous body, of the light pipe, and is thermally coupled with the light pipe;

the excitation light emitted by the excitation light source is incident on the light pipe from the incident end face of the light pipe, is conducted in the light pipe, and then is incident on the luminous body from the light incident face of the luminous body; a heat conducting medium is arranged between the light pipe and the heat radiating body.

2. A light source device according to claim 1, wherein the heat conducting medium is a heat conducting glue.

3. A light source device according to claim 1 or 2, wherein the cross section of the light pipe is a split ring, and the light pipe further comprises two side end surfaces connecting the inner pipe wall surface, the outer pipe wall surface, the incident end surface and the bottom end surface at the same time.

4. A light source device as claimed in claim 1 or 2, wherein the light pipe comprises a material having a refractive index greater than 1.8, the excitation light being conducted within the light pipe by total reflection.

5. A light source device as claimed in claim 1 or 2, characterized in that the bottom end surface of the light pipe is provided with a reflective layer or structure comprising a specular reflective layer, a dichroic sheet or a diffuse reflective structure.

6. A light source device according to claim 1 or 2, characterized in that an antireflection film, an angle-selective film or a dichroic film is provided at the incident end face of the light pipe.

7. A light source device as claimed in claim 1 or claim 2, wherein part of the light emitters are beyond the length of the light pipe.

8. A light source device according to claim 1 or 2, characterized in that the light exit face of the luminaire is provided with a wavelength filter membrane, an analyzer membrane or an angle selection membrane.

9. A light source device according to claim 1 or 2, wherein the excitation light source comprises at least two light emitting units, the incident light spots of the at least two light emitting units on the incident end face are not coincident, and the light emitting units are spatially uniformly distributed around the light pipe axis at the light spot positions of the incident end face of the light pipe.

10. A vehicle lamp comprising the light source device according to any one of claims 1 to 9, further comprising a light collecting device provided on an outgoing light path of the luminous body for collecting and outputting outgoing light of the luminous body.