WO2020001055A1 - Light source apparatus and vehicle light - Google Patents

Abstract

A light source apparatus (10), comprising: an excitation light source (110), used for emitting an excited light; a light guide tube (120), comprising an inner tube wall (122), an outer tube wall (121), an incident end surface (123), and a bottom end surface (124), the incident end surface (123) being provided opposite the bottom end surface (124), the incident end surface (123) being connected to the inner tube wall (122) and the outer tube wall (121); a light-emitting body (130), provided on the tube wall of the light guide tube (120) and capable of absorbing the excited light and emitting the excited light, the surface of the light-emitting body in proximity to the light guide tube (120) being a light incident surface; and, a heat dissipating body (140), provided on the side of the light guide tube (120) away from the light-emitting body (130) and thermally coupled with the light guide tube (120). The excited light emitted by the excitation light source is shone into the light guide tube (120) via the incident end surface thereof, transmitted within the light guide tube (120), and shone into the light-emitting body (130) via the light incident surface of the light-emitting body (130). With the separation of light guiding and thermal conduction functions of a light guide, the tube wall of the discrete light guide tube (120) is in charge of light guiding, and the discrete heat dissipating body (140) is in charge of thermal conduction, thus avoiding the problem of selecting a costly light guide having great thermal conductivity and great light guiding performance at the same time, and allowing light homogenization to be implemented with a shortened transmission distance.

Description

Light source device and vehicle light Technical field

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

Background technique

With the increasing demand for lighting brightness, the industry has high expectations for solid-state light sources. Existing LED lighting is gradually progressing towards the combination of high-power and multiple light-emitting elements. However, due to the characteristics of LEDs, with the increase of electrical power and the intensification of light-emitting elements, heat dissipation issues have increasingly hindered the improvement of lighting brightness.

Laser diodes, which also belong to the solid-state light source, have the advantages of high luminous brightness under large current and long irradiation distance. Usually, the laser diode is used to excite the phosphor to obtain white light. By separating the laser light source from the fluorescent light-emitting material, those skilled in the art can avoid the superimposition of the heat generated by the laser light source and the fluorescent light-emitting material, so that the brightness of the entire light source is further improved, which has become an accepted technical solution in the industry.

However, with the further demand for lighting brightness, the heat dissipation of fluorescent light-emitting materials has gradually become a problem that plagues the industry. For this reason, the industry has focused its research on finding materials that have both good light guiding properties and good thermal conductivity. However, it is foreseeable that even if such materials are developed, the cost of materials cannot be solved in the short term. problem. Therefore, a simple and economical light-emitting structure is in urgent need of invention.

Summary of the invention

In view of the high cost and difficult heat dissipation of the prior art, the present invention provides a low-cost and good heat dissipation light source device, including: an excitation light source for emitting excitation light; a light guide tube including an inner tube wall surface and an outer tube wall surface An incident end surface and a bottom end surface, the incident end surface being opposite to the bottom end surface, the incident end surface connecting the inner tube wall surface and the outer tube wall surface; a light emitting body provided on the inner tube wall surface of the light guide tube Or the wall surface of the outer tube can absorb excitation light and emit laser light, and the surface of the light emitting body near the light guide tube is a light incident surface; a heat sink is disposed on the light guide tube side away from the light emitting body. The heat sink is thermally coupled to the light guide tube; the excitation light emitted by the excitation light source enters the light guide tube from the incident end surface of the light guide tube, and is transmitted from the light guide tube through the light guide tube. A light incident surface of the light emitting body is incident on the light emitting body.

Compared with the prior art, the present invention includes the following beneficial effects:

In the present invention, the light guide between the excitation light source and the light emitter is set as a light guide tube, so that the excitation light is incident and conducted between the inner and outer tube wall surfaces of the light guide tube (that is, inside the tube wall), regardless of whether the light emitter is provided in the light guide. The inner pipe wall surface of the pipe or the outer pipe wall surface can be provided with a heat sink on the other pipe wall surface to dissipate the heat generated by the light emitting body. The invention separates the light guide and heat conduction functions of the original light guide. The wall of the independent light guide tube is responsible for light guide and the independent heat sink is responsible for heat conduction. This avoids the need to select a light guide with high thermal conductivity and high light guide performance. Cost issues.

At the same time, the excitation light is transmitted in the tube wall of the light guide tube, which reduces the reflection distance of each time when the light is transmitted in the light guide tube, and achieves a shorter The distance achieves light uniformity; in other words, compared with the light guide tube or solid light guide rod that guides light in the die (that is, the inner tube wall surface), the present invention achieves a more uniform light guide tube with the same size of the light guide tube. Outgoing light distribution. Compared with the flat-type light guide, the light guide tube conducts light in two dimensions, reducing the overall volume of the light guide, and achieving uniform light with a shorter transmission distance.

In the present invention, the actual light guiding structure of the light guide tube is a tube wall instead of a tube core, and the light guide tube wall may have various structures. For example, the cross section of the light guide tube can be a closed ring (such as a ring, a square ring, a polygonal ring, etc.), and the excitation light is reflected back and forth in the closed ring on the one hand to fill the entire closed ring in the cross section, and on the other hand The light guide tube propagates axially; the cross section of the light guide tube can also be a split ring (such as an arc ring, etc.). In the cross section, the excitation light is reflected multiple times to fill the split ring, and the two ends of the split ring are The reflection prevents the light beam from leaking.

In one embodiment, further, along the axial direction of the light guide tube, the length of the light guide tube is longer than the length of the light emitter, and the light emitter is far from the incident end surface of the light guide tube. This embodiment enables the excitation light to reach the entire cross section of the light guide tube through a certain distance of transmission before reaching the luminous body, ensuring that the beam reaches each position of the luminous body with a uniform illuminance, and prevents the light beam from entering the light too early. The heat generation problem caused by the high local power density of the excitation light of the luminous body.

In one embodiment, the luminous body is disposed on an outer tube wall surface of the light guide tube, and the heat sink is disposed on a die of the light guide tube. This embodiment makes the light emitted by the luminous body not need to pass through the light guide tube, which facilitates the light emitted by the luminous body to be directly emitted, and the same amount of light emitting body is thinner; on the other hand, the heat sink can be concentrated on the core of the light guide tube. It has a wider heat dissipation channel, which facilitates the rapid heat dissipation.

In an embodiment, further, in at least a part of the light guide tube, the light emitting body does not completely cover the light guide tube in a circumferential direction of the light guide tube. In this embodiment, the outer tube wall surface of the light guide tube not covering the light-emitting body is a total reflection surface or a reflection layer / reflection structure is provided. This embodiment enables the light beam to be emitted in a certain direction with directivity.

In one embodiment, further, at different positions along the light guide tube, the circumferential angle of the light guide covering the light guide tube increases with the distance from the incident end surface of the light guide tube. Monotonous. In this embodiment, as the distance from the incident end surface of the light guide tube increases, the number of light emitters covering the light guide tube gradually increases or does not change, so that more light can reach the light emitters at a remote location, which is beneficial to improving the light emitter's performance. Luminous uniformity.

In one embodiment, a light emitting surface and a light incident surface of the luminous body are disposed opposite to each other.

In one embodiment, a light emitting surface of the luminous body is disposed adjacent to a light incident surface, and an area of the light emitting surface is smaller than an area of the light incident surface. In this embodiment, the excitation light homogenized by the light guide tube is incident on the light incident surface of the light emitter with a larger area (that is, a smaller excitation light power density), and then the laser light is emitted from the small area end face of the light emitter. It forms a high lumen density of outgoing light, which can be applied to various high lumen lighting / display fields.

In one embodiment, the luminous body is disposed on an inner tube wall surface of the light guide tube, the luminous body is a solid block structure, and the light emitting surface of the luminous body is disposed adjacent to the light incident surface. Different from the foregoing “the light emitter is outside the light guide tube and the heat sink is inside the die”, in this embodiment, a block-shaped light emitter is placed on the die so that a large area of light incident surface receives the light from the light guide tube uniformly, Low lumen density excitation light, and high-lumen density laser light is emitted from the small-area light exit surface of the end face. On the one hand, the local heat generation of the luminous body is reduced, and the thermal quenching of the luminous body material is prevented; on the other hand, a high lumen density emitted light is obtained.

In one embodiment, the excitation light source includes at least two light emitting units, and the incident light spots on the incident end surface of the at least two light emitting units do not overlap. Because it is difficult for the excitation light spot to cover the incident end face of the light guide tube, the distribution of the incident light spot on the incident end face of the light guide tube is uneven, and it must pass through a certain distance to cover the entire cross section of the light guide tube. 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 face not overlapped, the coverage of the incident light spot is enlarged in advance, so that the excitation light can cover the whole with a shorter distance. Light pipe cross section. Preferably, the light spot positions of the light emitting units at the incident end face of the light guide tube are uniformly distributed around the axis of the light guide tube.

In one embodiment, the light source device further includes a light guide device disposed between the excitation light source and the light guide tube, and the excitation light is incident on an incident end surface of the light guide tube through the light guide device, and The light guiding device includes a lens, a lens group, or an optical fiber.

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

In one embodiment, the reflective layer at the bottom end of the light guide tube may be a specular reflective layer, such as an aluminum film, a silver film, or a dichroic film, such as a wavelength filter, or a diffuse reflection structure, such as plating Diffusion sheet with reflective film, metal reflective substrate with glass reflective powder layer, reflective adhesive layer, etc.

In one embodiment, a wavelength conversion material is provided on the bottom end surface of the light guide tube. In this embodiment, the remaining excitation light reaching the bottom end surface of the light guide tube may be emitted from the bottom end surface side of the light guide tube by the light conversion effect of the wavelength conversion material on the bottom end surface.

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

In one embodiment, the light guide tube and the heat sink are connected by a thermally conductive adhesive. This embodiment can increase the thermal contact interface between the two and eliminate the stress between the two.

In one embodiment, the heat sink comprises a heat pipe, or the heat sink comprises a flowing thermally conductive medium. Since the heat sink does not need to consider the light guiding problem, in this embodiment, a heat pipe and a liquid cooling structure with higher heat dissipation efficiency can be selected to further avoid the problem of thermal quenching of the light emitter, so that the light emitter can withstand higher power density excitation. Light exposure.

In one embodiment, the heat dissipating body includes a first heat dissipating portion and a second heat dissipating portion arranged along an axial direction of the light guide tube, and a size of the first heat dissipating portion in a radial direction of the light guide tube is smaller than The size of the second heat sink along the radial direction of the light guide tube, the heat sink is thermally coupled to the light guide pipe through the second heat sink, and the first heat sink is connected to the light guide pipe There is no contact, and the second heat radiating portion is close to the light emitting body relative to the first heat radiating portion. In the present invention, the luminous body is a real "heat source". In this embodiment, the heat dissipating body is divided into a first heat dissipating part and a second heat dissipating part, so that the second heat dissipating part close to the light emitting body is used as the main heat dissipating of the light emitting body. The structure, under the premise that the heat dissipation effect of the heat dissipation body is not significantly reduced, so that the first heat dissipation portion does not need to be in thermal contact with the light guide tube, so there is no need to set a reflective structure between the first heat dissipation portion and the light guide tube, and the heat conduction tube can be relied only on The total reflection function of the inner tube wall surface realizes the transmission of excitation light, improves the light transmission efficiency, and solves the cost.

The invention also provides a vehicle lamp, which includes the light source device as described above, and further includes a light collection device, which is arranged on the light path of the light emitted from the light emitting body for collecting the light emitted from the light emitting body and emitting the light.

In one embodiment, the light collection device is at least one of a reflective bowl, a total reflection lens, and a lens group.

The vehicle lamp of the present invention, especially the technical solution in which the luminous body is arranged on the outer tube wall surface of the light guide tube, can simulate the light shape of the filament bulb of the current halogen vehicle lamp through the light source device, thereby achieving a simple replacement of the halogen vehicle lamp and improving The brightness of the lamp reduces the energy consumption of the lamp and reduces the cost of replacing the lamp.

BRIEF DESCRIPTION OF THE DRAWINGS

1a is a schematic structural diagram of a light source device according to a comparative example of the present invention;

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

2a is a schematic structural diagram of a light source device according to Embodiment 1 of the present invention;

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

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

2d is a schematic structural cross-sectional view of a light pipe according to still another modified embodiment of the first embodiment of the present invention;

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

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

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

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

6 is a schematic structural diagram of a light source device according to Embodiment 5 of the present invention;

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

8 is a schematic structural diagram of a light source device according to Embodiment 7 of the present invention;

FIG. 9 is a schematic structural diagram of a vehicle lamp according to an embodiment of the present invention.

detailed description

The inventive concept of the present invention is mainly that the light guide adopted by the present invention adopts a structure different from the past, and realizes great improvements in optical and thermal aspects. First, the tube wall of the light guide is used instead of the core to conduct light transmission, and the light guide and the heat conduction function of the light guide are separated, so as to be used exclusively by professionals; second, the shape of the tube light guide is used to reduce the radial transmission of the light beam. Distance, shortening the average reflection distance of the light beam increases the number of reflections of the light beam, so that the light beam is uniformized and spread to the entire light guide section more quickly, which is beneficial to reducing the length of the light guide and improving the uniformity of the excitation light.

Please refer to FIG. 1a and FIG. 1b. FIG. 1a is a schematic structural diagram of a pair of light source devices according to 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. 1a. The light source device includes an excitation light source 1, a light guide 2, and a light emitting body 3. The light guide 2 is a solid light guiding rod, and the light body 3 surrounds and covers the surface of the light guide 2. The excitation light emitted by 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. After the light guide 2 is homogenized, it is incident on the light incident surface of the light emitter 3 with a uniform light distribution, that is, the light emitter 3 and the light guide. 2 contact surface.

In this comparative example, the luminous body 3 absorbs the excitation light and emits the received laser light. Due to the Stokes shift, there is an unavoidable energy loss in the conversion process. The lost energy is converted into thermal energy, making the luminous body 3 the most important heat source. . On the one hand, the light guide 2 is used as a light homogenizing device, which converts the incident excitation light with a high lumen density into light with a large area and low energy density; on the other hand, as a heat sink, it conducts and dissipates the heat emitted by the light emitting body 3. The functional requirements of light guide 2 lead to the need to select materials with low light absorption and high thermal conductivity.

In addition, in this comparative example, the incident excitation light is reflected and propagated in the light guide 2 and a uniform distribution is formed by multiple reflections. After the size of the luminous body 3 is determined, the number of reflections of the incident excitation light in the light guide 2 is limited. When the position of the incident spot incident on the light guide 2 deviates from the center of the light guide 2 (that is, the spatial distribution of the incident light is not uniform), it is insufficient The number of reflections will cause the uneven distribution of the excitation light in the light guide, and further affect the spatial uniformity of the light emitted from the light emitter 3. Therefore, after the size of the luminous body is determined, the light guide needs to be as long as possible to achieve uniformity of light.

Different from the comparative example, the light source device of the present invention includes an independent excitation light source, a light guide tube, a light emitter and a heat sink. The excitation light emitted by the excitation light source is uniformized by the light guide tube, and then enters the light from the light incident surface of the light emitter. The luminous body absorbs the excitation light and emits laser light, and generates heat at the same time. The heat enters the heat sink through the light guide tube, and is then conducted and dissipated by the heat sink. Each component of the light source device is described in detail below.

<Excitation light source>

The excitation light source is used to emit excitation light by converting electrical energy into light energy. In the present invention, the function of the excitation light source is to provide at least a part of the excitation light for the luminous body to absorb and emit the laser light. The final laser light or the combination of the laser light and the remaining excitation light is the output light of the light source device we want.

The excitation light source may be a solid-state light source, such as a semiconductor light emitting technology LED light source or an LD (Laser Diode, laser diode) light source. This type of light source has high luminous efficiency, energy saving and environmental protection. In particular, the laser diode light source has a luminous efficiency far greater than that of LEDs under large currents, and the divergence angle of the emitted light is small, which is convenient for collecting and entering the light guide tube.

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 includes more than two light-emitting units, the light-emitting units can be combined into a single beam of light and incident on the light guide tube. This technical solution can increase the beam brightness. For example, multiple LEDs can combine light to obtain high lumen density. Excitation light.

In another technical solution, different light emitting units are incident into the light guide tube at different positions, that is, the incident light spots of different light emitting units on the incident end face of the light guide tube do not coincide. It can be understood that when the incident spot of the light guide tube can cover the entire incident end face, uniform light distribution can be obtained in the shortest distance. However, if the incident spot covers the entire incident end face, the incident spot must be larger than the incident end face, resulting in Light loss. Therefore, this technical solution achieves a balance. By using different light emitting units to enter at different positions, the total incident spot area of the incident end face is enlarged without exceeding the incident end face of the light guide tube, so that the excitation light can be more effectively Uniform light over a short distance. In a preferred embodiment, the incident light spots of each light emitting unit on the incident end face of the light guide tube are evenly distributed around the light guide tube axis. This solution can further improve the light uniformity performance. When the number of light emitting units gradually increases, the technical solution It will gradually approach the technical scheme of the incident spot covering the entire incident end face.

<Light pipe>

The light guide tube is used to receive the excitation light from the excitation light source, homogenize it by multiple reflections, and then transmit the excitation light to the light incident surface of the light emitter, wherein the surface of the light emitter near the light guide tube is light incidence surface. The excitation light is transmitted in the tube wall of the light guide tube. The light guide tube includes an inner tube wall surface, an outer tube wall surface, an incident end surface, and a bottom end surface. The incident end surface is opposite to the bottom end surface, and the incident end surface is respectively opposite the inner tube wall surface and the outer tube. Wall connection. The excitation light is reflected on the wall surface of the outer tube and the wall surface of the inner tube.

The invention does not limit the specific shape of the light guide tube. For example, the light guide tube may be a round tube or a square tube. At this time, the cross section of the light guide tube is a circular ring and a square ring, the outer ring corresponds to the outer tube wall surface, and the inner ring corresponds to the inner tube wall surface. Of course, the cross section of the light guide tube can also be a closed ring of other shapes, such as a hexagonal ring. When the excitation light is incident on the incident end face of the light guide tube, along the direction away from the incident end face, the spot area of the cross section gradually expands until it fills the entire cross section to achieve a uniform distribution of the light beam in the light guide tube.

In some embodiments of the present invention, the cross section of the light guide tube is a split ring shape. At this time, the light guide tube includes an inner tube wall surface, an outer tube wall surface, an incident end surface, and a bottom end surface. Two side end surfaces of the tube wall surface, the outer tube wall surface, the incident end surface, and the bottom end surface. The two side end surfaces prevent the excitation light from leaking from the opening of the split ring by a light reflection function.

The main function of the light guide tube is light guide, and its material is selected from transparent materials with low light absorption, such as glass.

In some embodiments, the light guide tube preferably uses a material with a high refractive index, for example, a material with a refractive index greater than 1.8. This technical solution can use the principle of total reflection, so that the excitation light is efficiently transmitted in the light guide tube.

In other embodiments, instead of using the principle of total reflection, the light guide tube is provided with a reflective layer on the wall surface of the light guide tube, which can also achieve the function of light transmission.

In some technical solutions of the present invention, in order to prevent the excitation light from being transmitted to the bottom end surface in the light guide tube and still not completely absorbed, a reflective layer or a reflective structure is provided on the bottom end surface. Through these reflective layers / reflection structures, the bottom will be reached. The remaining excitation light reflection on the end face will be reused by the light guide tube, and the light distribution of the excitation light in the light guide tube along the length of the light guide tube is improved to a certain extent. Specifically, the reflection layer may be a specular reflection layer, such as an aluminum film, a silver film, or a dichroic film, such as a wavelength filter, or a diffuse reflection structure, such as a diffusion plate coated with a reflection film, provided with Glass reflective powder layer, metal reflective substrate, reflective adhesive layer, etc.

Similarly, in order to prevent the excitation light propagating in the light guide tube from leaking at the bottom end surface, a wavelength conversion material can be provided on the bottom end surface of the light guide tube, so that the remaining excitation light reaching the bottom end surface of the light guide tube can also pass through the wavelength conversion material of the bottom end surface. The light conversion effect, which is emitted from the bottom end side of the light guide tube, improves the light safety.

In order to increase the efficiency of the excitation light entering the light guide tube, an anti-reflection coating may be provided on the incident end surface of the light guide tube to improve the light transmittance.

In order to prevent the excitation light from leaking from the incident end face after being reflected in the light guide tube, an angle selection film may be provided on the incident end face so that the excitation light at a predetermined incident angle is transmitted and the light at other incident angles is reflected. You can also choose other filter films to achieve various dichroic functions.

<Luminous body>

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

The luminous body may also be a fluorescent ceramic, such as a pure phase fluorescent ceramic and a complex phase fluorescent ceramic.

Pure-phase fluorescent ceramics can be various oxide ceramics, nitride ceramics, or oxynitride ceramics. A light-emitting center is formed by adding a trace amount of an activator element (such as a lanthanide element) during the ceramic preparation process. Because the doping amount of the activator element is generally small (generally less than 1%), such fluorescent ceramics are usually transparent or translucent luminescent ceramics. In one embodiment of the present invention, the light-emitting ceramic layer is a Ce-doped YAG ceramic; in another embodiment of the present invention, the light-emitting ceramic layer is a Ce-doped LuAG ceramic.

Generally, pure phase fluorescent ceramics have a polycrystalline structure. In some embodiments of the present invention, the luminous body can also be a fluorescent single crystal. The fluorescent single crystal has better light transmission properties, and is generally colored and transparent, and its thermal conductivity is high. , And can produce total reflection on the surface.

A multi-phase fluorescent ceramic uses transparent / translucent ceramic as a matrix, and fluorescent ceramic particles (such as phosphor particles) are distributed in the ceramic matrix. The transparent / translucent ceramic matrix can be various oxide ceramics (such as alumina ceramics, Y ₃ Al ₅ O ₁₂ ceramics), nitride ceramics (such as aluminum nitride ceramics), or oxynitride ceramics. The role of the ceramic matrix is to Light and heat are conducted so that the excitation light can be incident on the fluorescent ceramic particles and the received laser light can be emitted from the multi-phase fluorescent ceramics; the fluorescent ceramic particles assume the main luminous function of the fluorescent ceramics and are used to absorb the excitation light and convert it To be affected by laser. The crystal grain size of the fluorescent ceramic particles is large, and the doping amount of the activator element is large (such as 1 to 5%), which makes the luminous efficiency high; and the fluorescent ceramic particles are dispersed in the ceramic matrix to avoid being located in the fluorescent ceramics. The situation that the fluorescent ceramic particles at a deeper position cannot be irradiated by the excitation light also avoids the poisoning of the activator element concentration caused by the large doping amount of the pure phase fluorescent ceramic as a whole, thereby improving the luminous efficiency of the fluorescent ceramic.

In an embodiment of the present invention, scattering particles may be further added in each of the above luminous bodies, so that the scattering particles are distributed in the luminous body. The function of the scattering particles is to enhance the scattering of the excitation light in the luminescent ceramic layer, thereby increasing the optical path of the excitation light in the light emitting body, so that the light utilization rate of the excitation light is greatly improved, and the light conversion efficiency is improved. The scattering particles can be scattering particles, such as alumina, yttrium oxide, zirconia, lanthanum oxide, titanium oxide, zinc oxide, barium sulfate, etc., can be either a single material scattering particle, or a combination of two or more It is characterized by apparent white color, which can scatter visible light, and is stable in material, can withstand high temperature, and the particle size is in the same order of magnitude or one order of magnitude as the wavelength of the excitation light. In other embodiments, the scattering particles can also be replaced with pores of the same size, and the refractive index difference between the pores and the matrix or the adhesive is used to achieve total reflection to scatter the excitation light or laser light.

The fluorescent ceramic may also be another composite ceramic layer, and the composite ceramic layer is different from the above-mentioned multi-phase fluorescent ceramic only in that the ceramic matrix is different. The ceramic matrix is a pure phase fluorescent ceramic, that is, the ceramic matrix itself has an activator, and can emit laser light under the irradiation of excitation light. This technical solution combines the advantages of the above-mentioned luminescent ceramic particles of the multi-phase fluorescent ceramic with high luminous efficiency and the advantages of the above-mentioned pure-phase fluorescent ceramic with luminescent performance. At the same time, the fluorescent ceramic particles and the fluorescent ceramic matrix are used to emit light, which further improves the luminous efficiency. Moreover, although the ceramic matrix has a certain amount of activator doping, the doping amount is low, which can ensure that the ceramic matrix has sufficient light transmission. In this luminous body, it is also possible to increase scattering particles or pores to enhance internal scattering.

The light-emitting material (such as phosphor) in the light-emitting body is not limited to a single material, and may also be a combination of multiple materials, or may be a superimposed combination of multiple material layers. The volume distribution of the light-emitting center in the light-emitting body is not limited to a uniform distribution, and may be a non-uniform distribution such as a gradient distribution.

In the present invention, the luminous body is disposed on the light guide tube, and may be disposed on the outer tube wall surface of the light guide tube or on the inner tube wall surface of the light guide tube.

Regardless of whether the luminous body is disposed on the outer tube wall surface or the inner tube wall surface of the light guide tube, the length of the luminous body is preferably smaller than the length of the light guide tube. This is because the excitation light emitted by the excitation light source cannot form uniform light as soon as it enters the light guide tube. It needs to pass through a certain distance of conductive reflection to fill the cross section of the light guide tube to be uniform. Therefore, in some preferred technical solutions of the present invention, the length of the light guide tube is greater than the length of the light emitter, and the light emitter is far from the incident end surface of the light guide tube, 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, the uniformity is sacrificed, so that the length of the light emitter is equal to the length of the light guide tube, and even the length of the light emitter is greater than the length of the light guide tube. For the luminous body that exceeds the length of the light guide tube, the total reflection or reflection of the excitation light on the surface of the luminous body can be used for conduction. In addition, even if the length of the luminous body is shorter than the light guide tube, it is still possible to make some of the luminous bodies exceed the length of the light guide tube, so that the part of the luminous body is set to "hang" with the light guide tube. Area to obtain more light patterns.

When the luminous body is disposed on the outer tube wall surface of the light guide tube, the heat dissipating body is disposed at the die position of the light guide tube, and the excitation light in the light guide tube enters the light through the outer tube wall surface which is optically coupled to the light incident surface of the light guide body. In this technical solution, the light emitted by the luminous body does not need to be emitted through the light guide tube, which is conducive to the direct emission of the light emitted by the luminous body. In addition, for the same light guide tube and the same amount of luminous bodies, this solution is arranged in the light guide The solution on the inner tube wall surface of the tube has a thinner luminous body; on the other hand, this technical solution enables the heat sink to be concentrated on the core of the light guide tube and has a wider heat dissipation channel, which facilitates the rapid heat dissipation.

When the luminous body is disposed on the inner tube wall surface of the light guide tube, the luminous body is a solid block structure, that is, the luminous body is disposed on the die of the light guide tube. In this technical solution, the light emitted by the luminous body is difficult to be emitted through the light guide tube. Therefore, in one embodiment, the light emitting surface of the luminous body is disposed adjacent to the light incident surface, and the light exiting direction of the light emitting surface of the luminous body is along The length of the light guide. The excitation light that has been homogenized by the light guide tube is incident around a large area of the luminous body, and is absorbed by the luminous body at a lower light lumen density, thereby improving the uniformity of heat generation without material thermal quenching caused by local overheating; In addition, the final emitted light is emitted from the end surface of the luminous body, the light emitting area is small, and the brightness is high, and the emitted light with high lumen density is obtained.

In the solution where the outer tube wall of the light guide tube covers the luminous body, for the part of the light pipe tube covering the luminous body, the luminous body can completely cover the wall surface of the light guide tube along the circumferential direction of the light guide tube, then the luminous body will Light can be emitted in all directions in the circumferential direction. In some other technical solutions, the light guide does not completely cover the light guide tube in the circumferential direction of the light guide tube in at least a part of the light guide tube. This technical solution limits the direction of the light emitted from the light guide.

Further, at different positions along the length of the light guide tube, the circumferential angle of the light guide covering the light guide tube varies. Especially in one solution, the circumferential angle of the light guide covering the light guide tube is monotonous as the distance from the incident end face of the light guide tube increases. This technical solution uses the feature that the excitation light in the light guide tube is gradually uniform. It is possible to obtain uniform light emission by blending the light emitting body.

In the present invention, the light emitting surface of the light emitting body may be an opposite surface of the light incident surface, or may be an adjacent surface of the light incident surface. In the technical solution that the luminous body is provided on the inner tube wall surface of the light guide tube, there is no light emitting surface opposite to the light incident surface, and only the adjacent surface of the light incident surface can be used as the light emitting surface, that is, the end face of the luminous body. In the technical solution in which the luminous body is disposed on the wall surface of the outer tube of the light guide tube, the light emitting surface of the luminous body may select an opposite surface similar to the area of the light incident surface or an adjacent surface having a smaller area. When a linear or planar illumination light source with a large area is required, a surface disposed opposite to the light incident surface is selected as the light exit surface. When a small-area light source with a high lumen density is required, the adjacent surface of the light incident surface is selected as the light exit surface. Of course, the opposite surface of the light incident surface and the adjacent surface may be used as the light emitting surface of the light emitting body at the same time.

In the present invention, an optical film can be added to the light exit surface of the luminous body to obtain light with specific optical characteristics. For example, by setting a wavelength filter film, only light in a certain wavelength range is transmitted to obtain outgoing light with high color purity, or by reflecting the excitation light, the light utilization ratio of the excitation light is improved. An analyzer diaphragm can also be provided to obtain light of a single polarization state. It is also possible to set an angle-selective diaphragm to obtain light with a small divergence angle.

<Heat sink>

The heat sink is used to conduct and dissipate the heat emitted by the light emitting body. The heat sink is in contact with the light guide tube and is located on the wall surface of the light guide tube away from the light emitter. Therefore, the heat emitted by the light emitter first passes through the tube wall of the light guide tube and is then conducted to the heat sink.

The heat sink can be any known heat sink structure, such as a metal heat sink. In one technical solution, the heat sink includes a heat pipe. In one technical solution, the heat sink includes a flowing thermally conductive medium. Since the heat sink does not need to consider the light guiding problem, in this embodiment, a heat pipe and a liquid cooling structure with higher heat dissipation efficiency can be selected to further avoid the problem of thermal quenching of the light emitter, so that the light emitter can withstand higher power density excitation. Light exposure.

In order to avoid the contact between the heat sink and the light guide tube to affect the optical performance of the light guide tube, a reflective layer or a reflective structure, such as a reflective film, may be provided between the light guide tube and the heat sink.

Since most heat sinks are metal, and the light guide tube is glass or ceramic, the thermal expansion coefficients of the two are quite different. In order to eliminate stress and ensure the thermal contact area of the two, a connection can be set between the light guide tube and the heat sink. Used thermal adhesive.

The structure of the heat sink can be improved to achieve improvement in volume and cost. In a technical solution in which a heat dissipating body is disposed on a die of a light guide tube, the heat dissipating body includes a first heat dissipating portion and a second heat dissipating portion arranged along an axis of the light guide tube, and the first heat dissipating portion has a size along a radial direction of the light guide tube. Smaller than the size of the second heat sink in the radial direction of the light guide tube, the heat sink is thermally coupled to the light guide pipe through the second heat sink, the first heat sink is not in contact with the light pipe, and the second heat sink is opposite The light-emitting body is located near the first heat-dissipating part (preferably, the projection of the second heat-dissipating part on the light guide tube and the light-emitting body's projection on the light-guide tube coincide). This technical solution can reduce unnecessary heat dissipation structures, enable the heat sink to dissipate heat to the light emitting body, and reduce costs.

The following describes the embodiments of the present invention in detail with reference to the accompanying drawings and embodiments.

Please refer to FIG. 2a, which is a schematic structural diagram of a light source device according to a first embodiment of the present invention. The light source device 10 includes an excitation light source 110, a light guide tube 120, a light emitting body 130, and a heat sink 140.

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

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

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

The heat dissipating body 140 is disposed on one side of the inner tube wall surface of the light guide tube 120, and the die of the light guide tube 120 is thermally coupled to the light guide tube 120.

The overall optical path is roughly that the excitation light emitted by the excitation light source 110 is incident on the light guide tube from the incident end surface 123 of the light guide tube 120, and is transmitted through the light guide tube 120, and then is emitted from the light incident surface of the light emitter 130 (that is, the light emitter 130 and The contact surface of the light guide tube 120 is incident on the light emitting body 130, and then the light emitting body 130 absorbs at least a part of the excitation light and emits the received laser light to form outgoing light. It can be understood that the light emitted by the illuminant 130 may be only the light receiving the laser light, or may be the light including the laser light and the non-absorbed excitation light. It is designed according to actual needs, and is not repeated here.

For a clearer description of the structure of the light guide tube 120, please refer to FIG. 2b, which is a schematic structural cross-sectional view of the light source device A-A shown in FIG. 2a. The reference numerals in FIG. 2b are consistent with those in FIG. 2a. The light emitting body 130, the light guide tube 120, and the heat sink 140 form a layered structure. The light guide tube 120 surrounds the heat sink 140, and the light emitting body 130 surrounds the light guide tube 120.

The shape of the light guide tube of the present invention is not limited to the circular tube type shown in FIG. 2b, and its cross section may also be other closed loops. Figure 2c is a schematic cross-sectional view of a light guide tube according to a modified embodiment of the first embodiment of the present invention. The figure shows the light guide tube 120c, the illuminant 130c, and the heat sink 140c. The cross section of the light guide tube 120c is square. ring. It can be understood that the cross section of the light guide tube of the present invention is not limited to a circular ring and a square ring, and may also be a ring of other shapes.

Moreover, the cross section of the light guide tube of the present invention is not limited to a closed ring, and may also be a split ring. Please refer to FIG. 2d, which is a schematic cross-sectional view of a light guide tube according to still another modified embodiment of the first embodiment of the present invention. The figure shows a light guide tube 120d, a light emitting body 130d, and a heat sink 140d. The cross section of the light guide tube 120d is a circular arc ring. In this embodiment, in addition to the outer tube wall surface, the inner tube wall surface, the incident end surface, and the bottom end surface, the light guide tube 120d has two additional surfaces. 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 guide tube is a non-closed tube, the heat sink provided therein can be extended from the light guide tube to further improve the heat radiation performance.

Returning to FIG. 2 a, in this embodiment, along the axial direction of the light guide tube 120, the length of the light guide tube 120 is longer than the length of the light emitter 130, and the light emitter 130 is located away from the incident end surface 123 of the light guide tube 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 tube 120, and the light emitting surface 131 of the light emitting body 130 is disposed opposite the light incident surface. Therefore, the light source device 10 of this embodiment can obtain light emitting rod-shaped light. The light source device can replace some existing rod-shaped / wire-shaped halogen filaments.

In this embodiment, in addition to the above-mentioned excitation light source 110, light guide tube 120, luminous body 130, and heat sink 140, the light source device 10 further includes a light guide device 150 disposed between the excitation light source 110 and the light guide tube 120. On the optical path, the excitation light is incident on the incident end surface 123 of the light guide tube 120 through the light guide device 150. The light guiding device 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 guiding device is not necessarily an optical structure, and the excitation light source can also be directly incident into the light guide tube.

In this embodiment, the heat sink may be a metal structure with fins, may be a heat sink structure including a heat pipe, and may be an active heat sink structure, such as a cooling chip. Since the heat dissipating body does not need to bear the optical function, various light-absorbing, light-transmitting, and light-reflecting materials can be selected without limitation. Therefore, the heat sink can also be a flowing heat conducting medium, such as cooling water. In this embodiment, since the excitation light is incident on the light guide tube by remote irradiation, the light guide tube, the light emitting body, and the heat dissipating body need not be electrically connected, and there is no need to worry about the safety of electric shock in the technical solution using cooling water. problem.

Please refer to FIG. 3 a, which is a schematic structural diagram of a light source device according to a second embodiment of the present invention. The light source device 20 includes an excitation light source 210, a light guide tube 220, a light emitting body 230, and a heat sink 240. The light guide tube 220 includes an inner tube wall surface 222, an outer tube wall surface 221, an incident end surface 223, and a bottom end surface 224. The incident end surface 223 is disposed opposite the bottom end surface 224, the inner tube wall surface 222 is disposed opposite the outer tube wall surface 221, and the incident end surface 223 is connected to the interior. The tube wall surface 222 and the outer tube wall surface 221. The luminous body 230 is disposed on the outer tube wall surface 221 of the light guide tube 220 and can absorb excitation light and emit laser light. The heat sink 240 is disposed on the inner tube wall side of the light guide tube 220. The excitation light emitted by the excitation light source 210 is incident from the incident end surface 223 of the light guide tube 220, and after being transmitted between the inner tube wall surface 222 and the outer tube wall surface 221, the light incident surface of the light emitting body 230 is incident on the light emitting body. The surface of the light guide tube is a light incident surface.

The difference between the second embodiment and the first embodiment shown in FIG. 2a is that a thermally conductive medium 250 disposed between the light guide tube 220 and the heat sink 240 is added. Specifically, the thermally conductive medium 250 may be a thermally conductive glue. Generally, the heat sink is a metal, and the light guide tube is an inorganic non-metallic material such as glass, ceramic, or single crystal. The two have different thermal expansion coefficients, and it is not easy to achieve a combination of the two. This embodiment can increase the thermal contact interface between the light guide tube 220 and the heat sink 240 and eliminate stress.

Due to the high refractive index of some thermally conductive adhesives, the total reflection conditions at the interface between the light guide tube and the thermally conductive adhesive may be invalid. Therefore, a reflective layer or a reflective structure may be provided between the light guide tube and the heat sink to ensure that the excitation light is guided in the light guide. No leakage in the light pipe.

The difference between this embodiment and the first embodiment is that, in at least a part of the light guide tube 220 in this embodiment, the light emitting body 230 does not completely cover the light guide tube in the circumferential direction of the light guide tube 220 (in the present invention, It refers to the case where the coverage angle is greater than 0 ° and less than 360 °, and the coverage is not included in the scope of this embodiment).

Please refer to FIG. 3b and FIG. 3c, which are schematic structural diagrams of a B-B cross-section and a C-C cross-section of the light source device 20 shown in FIG. 3a, respectively. Among them, for the B-B section, the light emitting body 230 covers an angle range of 180 ° along the circumferential direction of the light guide tube 220, and for the C-C section, the light emitting body 230 covers an angle range of 360 ° along the circumferential direction of the light guide tube 220.

The C-C cross section is similar to the foregoing embodiment, and is not repeated here. For the B-B cross-section shown in FIG. 3b, the light emitting body 230 emits light only 180 ° from one side of the light guide tube 220 to form a specific light distribution. The cross section of B-B does not cover one side of the luminous body, and the total reflection of the excitation light through the interface of the light guide tube 220 is confined in the light guide tube and transmitted in the axial direction. It can be understood that the cross-sectional angle of the light-emitting body 230 covering the light guide tube is not limited to 180 °, and may be any angle greater than 0 and less than 360 °.

In this embodiment, the B-B cross section is closer to the incident end surface 223 of the light guide tube 220 than the C-C cross section. The distribution of the incident initial light spot in the cross section of the light guide tube 220 is extremely uneven. As the light beam is conducted along the axial direction of the light guide tube 220, the distribution of the light spot in the cross section gradually diffuses to form a completely uniform surface distribution. Therefore, the smooth surface distribution of the B-B cross section corresponds to the uneven light distribution of the C-C cross section, and the light beam is mainly concentrated on the upper side of FIG. 3a. The light-emitting body 230 is also disposed on the side of the cross-section close to the incident spot to ensure that enough light is incident into the light-emitting body 230. In a modified embodiment of this embodiment, the circumferential angle of the light guide covering the light guide tube is not only the two cross-sections of B-B and C-C, but there are multiple different coverage angles. At different positions along the light guide tube, the circumferential angle of the luminous body covering the light guide tube is monotonous as the distance from the incident end surface of the light guide tube increases.

Please refer to FIG. 4, which is a schematic structural diagram of a light source device according to a third embodiment of the present invention. The light source device 30 includes an excitation light source 310, a light guide tube 320, a light emitting body 330, a heat sink 340, and a light guiding device 350.

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

The difference between this embodiment and the first embodiment shown in FIG. 2a is that the excitation light source 310 in this embodiment includes two light emitting units 311 and 312, and the light guide device 350 respectively uses two optical fibers to excite the two light emitting units. The light is guided to different positions of the incident end surface of the light guide tube 320 so that the incident light spots of the two at the incident end surface do not coincide.

The light distribution uniformity at the incident end face of the light guide tube 320 in this embodiment is better than the entrance end face of the light guide tube 120 in Embodiment 1, so that when the excitation light is transmitted in the light guide tube, the entire light guide tube is realized in a shorter distance. Uniform light distribution across the cross section.

In this embodiment, only two light emitting units are used to incident light spots at different positions on the incident end face of the light guide tube. It can be understood that more light emitting units can be used to illuminate different positions on the incident end face of the light guide tube to further improve the light on the incident end face. Uniform distribution.

In other embodiments of the present invention, the control of the position of the incident spot is not limited to the use of an optical fiber, and the excitation light can also be directly guided to the incident end surface by means of lens guidance and the like, which will not be repeated here.

The light-emitting unit in this embodiment only includes one laser diode. It can be understood that one light-emitting unit may also include multiple laser diodes or light-emitting diodes, and the multiple laser diodes or light-emitting diodes are used as one light-emitting unit after being combined.

Please refer to FIG. 5, which is a schematic structural diagram of a light source device according to Embodiment 4 of the present invention. The light source device 40 includes an excitation light source 410, a light guide tube 420, a light emitting body 430, a heat sink 440, and a light guiding device 450.

The difference from the above embodiments is that, in this embodiment, a bottom end surface of the light guide tube 420 is provided with a reflective layer 460. Through these reflective layers / reflection structures, the remaining excitation light reaching the bottom end face is reflected to the light guide tube for reuse, and the light distribution of the excitation light in the light guide tube along the length of the light guide tube is improved to a certain extent. Specifically, the reflective layer may be a specular reflective layer (including planar reflection and curved reflection), such as an aluminum film, a silver film, or a dichroic film, such as a wavelength filter (reflecting the excitation light band), or a diffuse film. Reflective structures, such as diffuser coated with reflective film, metal reflective substrate with glass reflective powder layer, reflective adhesive layer, etc.

In a modified embodiment of the fourth embodiment, the reflective layer 460 may also be replaced with a layer structure including a wavelength conversion material, so that the remaining excitation light reaching the bottom end surface of the light guide tube can also pass through the light conversion effect of the wavelength conversion material at the bottom end surface. absorbed. Specifically, the layer structure may be a layer structure including a wavelength conversion material, a reflective material, and an adhesive.

In the present invention, whether 460 is a reflective layer / reflective structure or a layer structure containing a wavelength conversion material, it is possible to prevent excitation light from leaking out from the bottom end surface, causing a light safety problem.

Please refer to FIG. 6, which is a schematic structural diagram of a light source device according to a fifth embodiment of the present invention. The light source device 60 includes an excitation light source 510, a light guide tube 520, a light emitting body 530, and a heat sink 540.

Different from the above embodiment, in this embodiment, the heat dissipating body 540 includes a first heat dissipating portion 541 and a second heat dissipating portion 542 arranged along the axial direction of the light guide tube 520, wherein the first heat dissipating portion 541 is along the light guide tube 520 The radial dimension of the second heat sink 542 is smaller than the radial dimension of the light guide pipe. The heat sink 540 is thermally coupled to the light guide pipe 520 through the second heat sink 542. The first heat sink 541 is not connected to the light guide pipe 520. And the second heat sink 541 is close to the light emitting body 530 relative to the first heat sink 542.

It can be seen from the figure that the projection of the second heat dissipation part 542 on the light guide tube 520 coincides with the projection of the light emitting body 530 on the light guide tube 520, which can most effectively meet the heat dissipation requirements. It can be understood that, in the axial direction of the light guide tube, the second heat dissipation portion may be longer than the light emitting body.

Please refer to FIG. 7, which is a schematic structural diagram of a light source device according to a sixth embodiment of the present invention. The light source device 60 includes an excitation light source 610, a light guide tube 620, a light emitting body 630, and a heat sink 640. The light emitting body 630 is disposed on the outer tube wall surface of the light guide tube 620, and can absorb excitation light and emit laser light. The heat sink 640 is disposed on the inner tube wall side of the light guide tube 620. The excitation light emitted by the excitation light source 610 is incident from the incident end face of the light guide tube 620, and after being transmitted between the inner tube wall surface and the outer tube wall surface, the light from the light incident surface 631 of the light emitting body 630 is incident on the light emitting body 630, and the light of the light emitting body 630 The incident surface 631 is optically coupled with the light guide tube 620.

Different from the above embodiments, in this embodiment, the light emitting surface 632 and the light incident surface 631 of the luminous body 630 are disposed adjacent to each other instead of the relative arrangement in the above embodiment, and the area of the light emitting surface 632 is smaller than that of the light. The area of the incident surface 631. The excitation light homogenized by the light guide tube 620 enters the light incident surface 631 of the light emitting body 630 with a larger area (that is, a smaller excitation light power density), and is then emitted by the laser light from the small area end face 632 of the light emitting body. The emitted light with a high lumen density can be applied to various high lumen lighting / display fields.

In each of the above embodiments, the embodiments in which the light emitter is on the wall surface of the outer tube of the light guide tube are listed. An embodiment in which the luminous body is provided on the inner tube wall surface of the light guide tube will be described below. It can be understood that the technical solutions in the above embodiments, such as the excitation light source includes multiple light emitting units, the type of light guide device, the length relationship between the light emitter and the light guide tube, the cross-sectional shape of the light guide tube, and the Technical features such as structure can be applied to the following embodiments.

Please refer to FIG. 8. FIG. 8 is a schematic structural diagram of a light source device according to Embodiment 7 of the present invention. The light source device 70 includes an excitation light source 710, a light guide tube 720, a light emitter 730, and a heat sink 740. The light emitter 730 is disposed on the light guide tube 720. The inner tube wall surface can absorb excitation light and emit laser light. The heat sink 740 is disposed on the outer tube wall side of the light guide tube 720. The excitation light emitted by the excitation light source 710 is incident from the incident end surface of the light guide tube 720, and is transmitted between the inner tube wall surface and the outer tube wall surface. Then, the light from the light incident surface 731 of the light emitting body 730 is incident on the light emitting body 730. The incident surface 731 is optically coupled to the light guide tube 720.

In this embodiment, the light emitting body 730 is a solid block structure, and the light emitting surface 732 and the light incident surface 731 of the light emitting body are disposed adjacent to each other. The excitation light enters the light incident surface 731 of the luminous body 730 with a larger area (that is, a smaller excitation light power density), and is then emitted by the laser light from the small area end face 732 of the luminous body to form a high lumen density outgoing light. Can be applied to various high lumen lighting / display fields.

This embodiment also separates the light guide and heat conduction functions of the original light guide. The wall of the independent light guide tube is responsible for light guide and the independent heat sink is used for heat conduction, avoiding the choice of a light guide with high thermal conductivity and high light guide performance. High cost problem.

The present invention also provides a vehicle lamp. Please refer to FIG. 9, which is a schematic structural diagram of a vehicle lamp according to an embodiment of the present invention. The vehicle light includes various light source devices listed above, including an excitation light source 010, a light guide tube 020, a light emitting body 030, a heat sink 040, and a light guiding device 050. The vehicle lamp further includes a light collection device 080, which is disposed on the light path of the light emitted from the light emitting body 030 and is used to collect and emit the light emitted from the light emitting body 030.

The light source device of the vehicle light can simulate the light type of a filament bulb of a current halogen vehicle light, and the light source device can be directly replaced in the vehicle light, thereby achieving improvement of the brightness and energy consumption of the vehicle light, and without changing the light collection device. Reduces the cost of replacing lights.

The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts between the embodiments, refer to each other.

The above is only an embodiment of the present invention, and thus does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly applied to other related technologies The same applies to the fields of patent protection of the present invention.

Claims (16)

1. A light source device, comprising:

   Excitation light source for emitting excitation light;

   The light guide tube includes an inner tube wall surface, an outer tube wall surface, an incident end surface, and a bottom end surface, the incident end surface is opposite to the bottom end surface, and the incident end surface connects the inner tube wall surface and the outer tube wall surface;

   The luminous body is arranged on the inner tube wall surface or the outer tube wall surface of the light guide tube, and can absorb excitation light and emit laser light, and the surface of the luminous body near the light guide tube is a light incident surface;

   A heat sink is disposed on a side of the light guide tube away from the light emitter, and the heat sink is thermally coupled with the light guide tube;

   The excitation light emitted by the excitation light source is incident on the light guide tube from the incident end surface of the light guide tube, and after being transmitted through the light guide tube, the light is incident on the light emitter from the light incident surface of the light emitter.
2. The light source device according to claim 1, wherein, along the axial direction of the light guide tube, the length of the light guide tube is greater than the length of the light emitter, and the light emitter is far from the light guide tube Incident end face.
3. The light source device according to claim 1, wherein the light emitting body is disposed on an outer tube wall surface of the light guide tube, and the heat sink is disposed on a die of the light guide tube.
4. The light source device according to claim 3, wherein in at least a part of the light guide tube, the light emitter does not completely cover the light guide tube in a circumferential direction of the light guide tube.
5. The light source device according to claim 4, characterized in that at different positions along the light guide tube, the luminous body covers a circumferential angle of the light guide tube as it moves away from the incident end surface of the light guide tube The distance increases without monotony.
6. The light source device according to any one of claims 1 to 3, wherein a light emitting surface and a light incident surface of the luminous body are disposed opposite to each other.
7. The light source device according to any one of claims 1 to 3, wherein a light emitting surface of the light emitting body is disposed adjacent to a light incident surface, and an area of the light emitting surface is smaller than the light incident surface Area.
8. The light source device according to claim 1 or 2, wherein the luminous body is disposed on an inner tube wall surface of the light guide tube, the luminous body is a solid block structure, and light emitted by the luminous body is emitted The surface is disposed adjacent to the light incident surface.
9. The light source device according to any one of claims 1 to 3, wherein the excitation light source includes at least two light emitting units, and incident light spots of the at least two light emitting units on the incident end surface do not overlap.
10. The light source device according to any one of claims 1 to 3, further comprising a light guide device provided between the excitation light source and the light guide tube, and the excitation light is incident on the light guide device through the light guide device. An incident end surface of the light guide tube, and the light guiding device includes a lens, a lens group, or an optical fiber.
11. The light source device according to any one of claims 1 to 3, wherein the bottom end surface of the light guide tube is provided with a reflective layer or a reflective structure.
12. The light source device according to any one of claims 1 to 3, wherein a wavelength conversion material is provided on the bottom end surface of the light guide tube.
13. The light source device according to any one of claims 1 to 3, wherein a reflective layer or a reflective structure is provided between the light guide tube and the heat sink.
14. The light source device according to any one of claims 1 to 3, wherein the heat sink comprises a heat pipe, or the heat sink comprises a flowing thermally conductive medium.
15. The light source device according to claim 3, wherein the heat dissipating body comprises a first heat dissipating portion and a second heat dissipating portion arranged along an axial direction of the light guide tube, and the first heat dissipating portion is along the light guide. The radial dimension of the light pipe is smaller than the radial dimension of the second heat dissipation part along the radial direction of the light guide tube. The heat sink is thermally coupled to the light guide tube through the second heat dissipation part. The heat radiation portion is not in contact with the light guide tube, and the second heat radiation portion is close to the light emitting body relative to the first heat radiation portion.
16. A vehicle lamp, comprising the light source device according to any one of claims 1 to 15, and further comprising a light collection device, which is arranged on an outgoing light path of the luminous body and is configured to emit the outgoing light of the luminous body. Shot after collection.

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