WO2022116630A1

WO2022116630A1 - Light source device

Info

Publication number: WO2022116630A1
Application number: PCT/CN2021/117643
Authority: WO
Inventors: 唐怀; 段艳松
Original assignee: 深圳市中光工业技术研究院
Priority date: 2020-12-01
Filing date: 2021-09-10
Publication date: 2022-06-09
Also published as: CN114578574A

Abstract

A light source device (1), comprising a housing (10), a laser light source assembly (20), a light guiding assembly (30), and a wavelength conversion element (40). The housing (10) is provided with an accommodating cavity (11), the housing (10) comprises a step mounting portion (16), the step mounting portion (16) is located in the accommodating cavity (11) and comprises a plurality of steps (161), and each step (161) comprises a step mounting surface (1612). The laser light source assembly (20) is mounted on a plurality of step mounting surfaces (1612). The light guiding assembly (30) is mounted on the step mounting portion (16) and guides the laser light emitted by the laser light source assembly (20) to be emitted in a predetermined direction. The wavelength conversion element (40) receives the laser light guided and emitted by the light guide assembly (30) and converts part of the incident laser light into excited light, and the excited light is combined with the unconverted laser light to form white light, and then the white light is emitted from the wavelength conversion element (40). The laser light source assembly (20) and the wavelength conversion element (40) are encapsulated into one piece, reducing the volume of the light source device (1), and improving the integration of the light source device (1).

Description

light source device

technical field

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

Background technique

Laser-excited phosphor technology to form white light is widely used in lighting and display applications, such as vehicle lamps, street lamps, and projection devices. In the existing technical solutions for integrating multiple lasers to excite phosphors to emit white light, most of them use multiple laser chips to independently package, then perform light integration, and finally excite the phosphors to generate white light. This kind of light source package has a huge packaging structure. , The problem of low integration, it is difficult to meet the demand.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a light source device to solve the above problems. The embodiments of the present invention achieve the above objects through the following technical solutions.

Embodiments of the present invention provide a light source device, including a housing, a laser light source assembly, a light guide assembly, and a wavelength conversion element. The housing is provided with an accommodating cavity, and the housing includes a step mounting portion, the step mounting portion is located in the accommodating cavity and includes a plurality of steps, and each step includes a step mounting surface. The laser light source assembly is mounted on a plurality of step mounting surfaces. The light guide assembly is mounted on the step mounting portion, and guides the laser light emitted by the laser light source assembly to emit in a predetermined direction. The wavelength conversion element receives the laser light guided and emitted by the light guide assembly, and converts part of the incident laser light into received laser light. The received laser light and the unconverted laser light are combined to form white light and then emitted from the wavelength conversion element.

In one embodiment, the housing includes a bottom plate and a side plate connected to the bottom plate, the bottom plate and the side plate enclose a receiving cavity, the step mounting portion is provided on the bottom plate, the side plate is provided with a mounting hole communicating with the receiving cavity, and the wavelength conversion element Install in the mounting hole.

In one embodiment, the side plate includes an inner surface located in the receiving cavity and a first mounting surface located in the mounting hole, the mounting hole includes a first mounting hole and a second mounting hole that communicate with each other, and the diameter of the second mounting hole is larger than The diameter of the first mounting hole, the first mounting hole penetrates through the inner surface and the first mounting surface, and the wavelength conversion element is mounted on the first mounting surface.

In one embodiment, the wavelength conversion element includes a wavelength conversion body, a functional film layer and a metal layer, the functional film layer and the metal layer are both disposed on the wavelength conversion body, the metal layer surrounds the functional film layer, the functional film layer and the first mounting hole Correspondingly, the wavelength conversion body is mounted on the first mounting surface through the metal layer.

In one embodiment, the wavelength conversion body includes a transparent body and a phosphor connected to each other, the functional film layer and the metal layer are located on the side of the transparent body away from the phosphor, and the phosphor corresponds to the functional film layer.

In one embodiment, the mounting hole further includes a third mounting hole communicating with the second mounting hole, the third mounting hole and the first mounting hole are respectively located on both sides of the second mounting hole, and the diameter of the third mounting hole is larger than that of the first mounting hole. Two mounting holes, the light source device further includes a collecting lens, the side plate further includes a second mounting surface located in the mounting hole, the second mounting hole penetrates the first mounting surface and the second mounting surface, and the collecting lens is mounted on the second mounting surface.

In one embodiment, the housing includes a bottom plate, a side plate and a cover plate, the cover plate is opposite to the bottom plate, the side plate is connected between the bottom plate and the cover plate, the bottom plate and the side plate enclose a receiving cavity, and the cover plate closes the receiving cavity The step mounting part is provided on the bottom plate, the cover plate is provided with a mounting hole communicating with the receiving cavity, the wavelength conversion element is mounted in the mounting hole, and the light source device also includes a laser reflector, and the laser reflector is provided on the laser beam emitted by the light guide assembly. On the optical path, it is used to reflect the laser light to the wavelength conversion element.

In one embodiment, the laser light source assembly includes a plurality of laser light source elements, the plurality of laser light source elements are installed on the plurality of stepped mounting surfaces in a one-to-one correspondence, and the plurality of laser light source elements are disposed on the same side of the light guide assembly.

In one embodiment, the laser light source assembly includes a plurality of laser light source elements, the plurality of laser light source elements are installed on the plurality of stepped mounting surfaces in a one-to-one correspondence, and the laser light source elements on two adjacent stepped mounting surfaces are arranged on the light source Opposite sides of the guide assembly.

In one embodiment, the laser light source assembly includes multiple groups of laser light source elements, each group of laser light source elements includes a first laser light source element and a second laser light source element, and each step mounting surface includes a first step mounting surface and a second step mounting surface Mounting surface, the height of the second step mounting surface on each step mounting surface is greater than the height of the first step mounting surface, the first step mounting surface is located between the second step mounting surface and the light guide assembly, and the first laser light source element is mounted on the The first step mounting surface, and the second laser light source element is mounted on the second step mounting surface.

In an embodiment, the light guide assembly includes a plurality of groups of slow-axis collimating lenses, each group of slow-axis collimating lenses is located between a group of laser light source elements and the wavelength conversion element, and the slow-axis collimating lenses include first and lower alignment lenses. The lens area and the second lens area, the first lens area is located between the first step mounting surface and the second lens area, the focal length of the second lens area is greater than the focal length of the first lens area, and the laser light emitted by the first laser light source element passes through the second lens area. A lens area is incident on the wavelength conversion element, and the laser light emitted by the second laser light source element is incident on the wavelength conversion element through the second lens area.

In one embodiment, the light guide assembly includes a plurality of groups of guide guides, a light homogenizer and a focusing lens, each group of guide guides includes a collimating lens and a reflecting element, and the laser passes through the collimating lens of the collimating lens and the reflecting element in turn. The reflection, the homogenization of the homogenizer and the focusing of the focusing lens are incident on the wavelength conversion element.

Compared with the prior art, the light source device provided by the present invention includes a casing, a laser light source assembly, a light guide assembly and a wavelength conversion element. The wavelength conversion element converts part of the incident laser light into the received laser light, and the received laser light and the unconverted laser light are combined to form white light and then emitted from the wavelength conversion element. The volume of the device improves the integration degree of the light source device.

These and other aspects of the invention will be more clearly understood from the description of the following embodiments.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a light source device provided by a first embodiment of the present invention.

FIG. 2 is a schematic structural diagram of the light source device (excluding the cover plate) provided by the first embodiment of the present invention under one viewing angle.

3 is a schematic structural diagram of the light source device (excluding the cover plate) provided by the first embodiment of the present invention from another viewing angle.

FIG. 4 is a schematic structural diagram of a mounting hole provided by the first embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a collimating lens provided by an implementation manner of the first embodiment of the present invention.

FIG. 6 is a schematic structural diagram of the wavelength conversion element provided by the first embodiment of the present invention under one viewing angle.

FIG. 7 is a schematic structural diagram of the wavelength conversion element provided by the first embodiment of the present invention from another viewing angle.

FIG. 8 is a schematic structural diagram of a wavelength conversion element provided by an implementation manner of the first embodiment of the present invention.

FIG. 9 is a schematic structural diagram of a light source device (excluding a cover plate) provided by a second embodiment of the present invention.

FIG. 10 is a schematic structural diagram of a light source device (excluding a cover plate) provided by a third embodiment of the present invention under one viewing angle.

11 is a schematic structural diagram of a light source device (excluding a cover plate) provided by a third embodiment of the present invention from another viewing angle.

FIG. 12 is a schematic structural diagram of a slow-axis collimating lens provided by a third embodiment of the present invention.

FIG. 13 is a schematic structural diagram of a light source device according to a fourth embodiment of the present invention.

FIG. 14 is a schematic structural diagram of a light source device (excluding a cover plate) provided by a fourth embodiment of the present invention.

Detailed ways

In order to facilitate understanding of the embodiments of the present invention, the embodiments of the present invention will be more fully described below with reference to the related drawings. The preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used in the embodiments of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

first embodiment

Referring to FIGS. 1 , 2 and 3 , an embodiment of the present invention provides a light source device 1 , which includes a housing 10 , a laser light source assembly 20 , a light guide assembly 30 and a wavelength conversion element 40 . The housing 10 is provided with a receiving cavity 11 . The laser light source assembly 20 is accommodated in the accommodating cavity 11 and emits laser light. The light guide assembly 30 is accommodated in the accommodating cavity 11 , and the light guide assembly 30 guides the laser light emitted by the laser light source assembly 20 to emit in a predetermined direction. The wavelength conversion element 40 is mounted on the housing 10 and receives the laser light guided and emitted by the light guide assembly 30 , and converts part of the incident laser light into the received laser light, and the received laser light and the unconverted laser light are combined to form white light, and then the wavelength conversion element 40 is emitted from the wavelength conversion element 40 . shoot.

In this embodiment, the casing 10 is roughly in the shape of a rectangular parallelepiped. The casing 10 includes a bottom plate 12 , a side plate 13 and a cover plate 14 . The cover plate 14 is opposite to the bottom plate 12 , and the side plate 13 is connected between the bottom plate 12 and the cover plate 14 .

The bottom plate 12 is substantially a rectangular plate-like structure, the bottom plate 12 and the side plates 13 enclose the receiving cavity 11 , and the cover plate 14 is used to close the receiving cavity 11 . In this embodiment, the bottom plate 12 is connected to the side plate 13 and protrudes out of the side plate 13 , wherein, the part of the bottom plate 12 protruding out of the side plate 13 can have a through hole, so that the fixing piece can be passed through, so that the fixing piece The housing 10 can be fixed through the through holes.

The side plate 13 includes four plate-like structures connected end to end. The side plate 13 is provided with a mounting hole 131 that communicates with the receiving cavity 11 , and the mounting hole 131 may be provided in one of the plate-like structures. In this embodiment, the mounting holes 131 may be used to mount the wavelength conversion element 40 .

Referring to FIGS. 2 and 4 , the side plate 13 includes an inner surface 132 and an outer surface 133 , wherein the inner surface 132 is located in the receiving cavity 11 , and the outer surface 133 is opposite to the inner surface 132 . In addition, the side plate 13 further includes a first mounting surface 134 and a second mounting surface 135, the first mounting surface 134 and the second mounting surface 135 are both located in the mounting hole 131, the inner surface 132, the first mounting surface 134, the second mounting surface 135 Surface 135 and outer surface 133 are parallel and spaced apart, with first mounting surface 134 between inner surface 132 and second mounting surface 135 between first mounting surface 134 and outer surface 133 .

In this embodiment, the installation hole 131 includes a first installation hole 1311 , a second installation hole 1312 and a third installation hole 1313 that are communicated with each other. The first installation hole 1311 penetrates through the inner surface 132 and the first installation surface 134 ; the second installation hole 1312 penetrates through the first installation surface 134 and the second installation surface 135 , and the diameter of the second installation hole 1312 is larger than that of the first installation hole 1311 Diameter; the third mounting hole 1313 and the first mounting hole 1311 are respectively located on both sides of the second mounting hole 1312 , and the diameter of the third mounting hole 1313 is larger than that of the second mounting hole 1312 . That is to say, the mounting holes 131 in this embodiment are stepped holes. In other embodiments, the mounting hole 131 may also be a smooth through hole, and the wavelength conversion element 40 may be mounted in the through hole by means of interference fit or adhesion.

Please continue to refer to FIG. 1 and FIG. 2 , the cover plate 14 is covered on the side plate 13 to close the receiving cavity 11, so that the laser light source assembly 20, the light guide assembly 30 and the like can be packaged. In this embodiment, the cover plate 14 and the side plate 13 may be hermetically sealed by parallel sealing welding. In other embodiments, the cover plate 14 can also be bonded to the side plate 13 by optical glue.

Please continue to refer to FIG. 2 and FIG. 3 , the housing 10 further includes a step mounting portion 16 , and the step mounting portion 16 is disposed on the bottom plate 12 and located in the receiving cavity 11 . Specifically, the step mounting portion 16 includes a plurality of steps 161 , each step 161 includes a step mounting surface 1612 , and the widths of two adjacent step mounting surfaces 1612 along the lengthwise extending direction D1 of the step mounting portion 16 may be the same. The width of the two adjacent stepped mounting surfaces 1612 along the lengthwise extending direction D1 of the stepped mounting portion 16 is based on the fact that the multiple laser beams emitted by the laser light source assembly 20 do not interfere after being guided by the light guide assembly 30 .

The laser light source assembly 20 is mounted on the plurality of stepped mounting surfaces 1612 . In this embodiment, the laser light source assembly 20 includes a plurality of laser light source elements 21 , and the plurality of laser light source elements 21 are mounted on the plurality of stepped mounting surfaces 1612 in a one-to-one correspondence, and each laser light source element 21 is mounted on a stepped mounting surface. On the basis of the middle position of the surface 1612, the distance between the two adjacent laser light source elements 21 is the width of the two adjacent stepped mounting surfaces 1612 along the extending direction D1 of the length of the stepped mounting portion 16, and the mounting method can be through a heat sink. 50 is welded to the step mounting surface 1612, and the heat sink 50 can be SiC or AlN, or other materials with good thermal conductivity and matching thermal expansion coefficients. Specifically, the laser light source element 21 and the heat sink 50 can be fixed by eutectic welding, and the heat sink 50 and the step mounting surface 1612 can be fixed by welding with solder paste or preformed solder, or by sintering with nano-gold glue . In this embodiment, the number of laser light source elements 21 can be equal to the number of step mounting surfaces 1612 , and can be any number greater than 1. The specific number can be determined according to the final white light brightness (luminous flux) required to be output and the difference between wavelength conversion elements 40 Saturation and thermal quenching occur. In this embodiment, the number of laser light source elements 21 is six. In other embodiments, two or more laser light source elements 21 can also be mounted on each step mounting surface 1612 .

The driving manner of the plurality of laser light source elements 21 may be single driving, or may be driven in series or in parallel. In this embodiment, the plurality of laser light source elements 21 are driven in series. Specifically, the plurality of laser light source elements 21 in the middle can be connected by gold wires (not shown), and the laser light source elements 21 at both ends can be Use gold wires to connect to the shell pins. The laser light source element 21 in this embodiment is a blue laser. As an example, the wavelength of the laser may be 420nm-470nm. A plurality of laser light source elements 21 are arranged on the same side of the light guide assembly 30 , which is convenient for the installation of the laser light source assembly 20 .

In other embodiments, the stepped surface 1612 may be additionally provided with a stepped surface 1613 , and the stepped surface 1613 protrudes from the stepped mounting surface 1612 .

The light guide assembly 30 is mounted on the stepped mounting portion 16 , and specifically, the light guide assembly 30 is mounted on the plurality of stepped mounting surfaces 1612 . The light guide assembly 30 may be used to guide the laser light to the wavelength conversion element 40 . In this embodiment, the light guide assembly 30 includes a light homogenizer 34 , a focusing lens 36 and a plurality of groups of guide guides 32 . The homogenizing member 34 can receive the reflected laser light, homogenize the laser light, and inject the homogenized laser light into the focusing lens 36 . The focusing lens 36 can receive the homogenized laser light, focus the laser light, and guide the focused laser light to the wavelength conversion element 40 .

In this embodiment, each group of guide guides 32 corresponds to one laser light source element 21 , and each group of guide guides 32 includes a collimating lens 321 and a reflecting element 323 . Specifically, the collimating lens 321 can collimate the laser light, and the collimated laser light can be incident on the reflective element 323 . The reflection element 323 can receive the collimated laser light and reflect the laser light to the light homogenizer 34 . That is to say, the laser light emitted by each laser light source element 21 can be sequentially collimated by the collimating lens 321 , reflected by the reflective element 323 , homogenized by the light homogenizer 34 and focused by the focusing lens 36 and then incident on the wavelength conversion element 40 . .

The collimating lens 321 includes a fast-axis collimating lens 3212 and a slow-axis collimating lens 3214, both of which may be cylindrical mirrors. The fast-axis collimating lens 3212 can perform fast-axis collimation on the laser; the slow-axis collimating lens 3214 can perform slow-axis collimation on the laser. The laser light emitted from the laser light source assembly 20 may first pass through the fast-axis collimating lens 3212, and then pass through the slow-axis collimating lens 3214, so as to achieve the purpose of reducing the spot size. In this embodiment, the fast-axis collimating lens 3212 and the slow-axis collimating lens 3214 may be two independent lenses. The fast-axis collimating lens 3212 and the slow-axis collimating lens 3214 can be fixed to the step mounting portion 16 by UV glue. Considering that the fast-axis collimating lens 3212 is relatively sensitive to position, the fast-axis collimating lens 3212 can be selected to be fixed to the front end of the laser light source element 21 . In this embodiment, both the laser incident surfaces of the fast-axis collimating lens 3212 and the slow-axis collimating lens 3214 can be coated with an AR film (Anti-reflective, anti-reflection film) corresponding to the laser wavelength (eg, 420nm-470nm) to reduce the End face reflection reduces the loss of laser light on the optical path.

Referring to FIG. 5 , in other embodiments, the fast-axis collimating lens 3212 and the slow-axis collimating lens 3214 may also be integrated, and the fast-axis collimating lens 3212 and the slow-axis collimating lens 3214 may be two cylindrical lenses, respectively. end face.

The reflection element 323 is located between the collimating lens 321 and the light homogenizer 34 , and the reflection element 323 can reflect the laser light to the light homogenizer 34 . The propagation direction of the laser light is changed by the reflective element 323 , so that the multiple laser beams incident on the light homogenizer 34 overlap in the horizontal direction, wherein the horizontal direction is parallel to the plane where the base plate 12 is located.

The reflective element 323 may be a reflective mirror, and an HR film (High reflective, high reflective film) corresponding to the laser wavelength may also be coated on the optical surface of the reflective mirror to achieve maximum reflection efficiency. The reflective element 323 can also be fixed to the step mounting portion 16 by UV glue, and the exact position of the reflective element 323 on the stepped mounting portion 16 can be determined by optical simulation.

The light homogenizer 34 is located between the reflection element 323 and the focusing lens 36 . Since the energy distribution of the laser light emitted by the laser light source element 21 obeys the Gaussian distribution, the energy distribution of the light spot after collimation by the fast collimating lens 321 and the slow-axis collimating lens 3214 is still high in the center, and high energy may cause too much heat generation , it is easy to cause reliability problems such as decrease in excitation efficiency of the wavelength conversion element 40 and thermal quenching of the wavelength conversion element 40 . The homogenizing member 34 can evenly distribute the energy of the laser beam on the surface, so that the laser energy distribution finally hit on the wavelength conversion element 40 is uniform, so as to maximize the excitation efficiency of the wavelength conversion element 40, and at the same time avoid the laser center energy. The problem of too much heat caused by too high. In this embodiment, the homogenizing member 34 is a fly-eye lens, and the fly-eye lens may be two single-sided fly-eye lenses, or one double-sided fly-eye lens. In other embodiments, the light homogenizer 34 may also be a diffusing sheet or a diffusing sheet.

The two end faces of the fly-eye lens can also be coated with AR film corresponding to the laser wavelength. The fly-eye lens can also be fixed on the step mounting portion 16 by UV glue, and the exact position of the fly-eye lens can also be determined by optical simulation. In other embodiments, the light homogenizer 34 may also be a homogenizer sheet.

The focusing lens 36 converges the laser light, and through the focusing of the focusing lens 36, the laser beam can be combined in a vertical direction, and the vertical direction is perpendicular to the plane where the base plate 12 is located. In this embodiment, the opposite end faces of the focusing lens 36 may also be coated with an AR film corresponding to the laser wavelength, so as to reduce the end face reflection. The focusing lens 36 may also be adhered and fixed to the step mounting portion 16 by UV glue.

Referring to FIG. 4 , FIG. 6 and FIG. 7 , the wavelength conversion element 40 can be located at the focal point of the focusing lens 36 , so that the combined laser light can be focused on the wavelength conversion element 40 . The wavelength conversion element 40 is mounted in the mounting hole 131 , specifically, the wavelength conversion element 40 is mounted on the first mounting surface 134 .

The wavelength conversion element 40 includes a wavelength conversion body 41 , a functional film layer 43 and a metal layer 45 , and the functional film layer 43 and the metal layer 45 are located on the side of the transparent body 411 away from the phosphor 413 .

In this embodiment, the wavelength conversion body 41 can be mounted on the first mounting surface 134 of the housing 10 through the metal layer 45 . The welding of the wavelength conversion body 41 and the casing 10 can not only seal the accommodating cavity 11, but also the heat emitted by the wavelength conversion element 40 can also be transferred to the casing 10 and dissipated to the external environment through the casing 10, which is conducive to wavelength conversion. Element 40 dissipates heat. The wavelength conversion body 41 can convert the incident laser light into excitation light, and can also be used to combine the excitation light and the unconverted laser light, so that the wavelength conversion element 40 can emit white light.

The metal layer 45 is disposed on the wavelength conversion body 41 and surrounds the functional film layer 43 . The metal layer 45 can be used for soldering the wavelength conversion body 41 to the first mounting surface 134 . In this embodiment, the metal layer 45 may be TiPtAu (titanium platinum) material, or may be other weldable metal composite materials, and the metal layer 45 may be plated by any method of evaporation, sputtering, electroplating, and electroless plating. on the wavelength conversion body 41 . The metal layer 45 can also be soldered on the first mounting surface 134 through a preformed solder tab, and the material of the solder tab can be 80Au20Sn. In addition to welding with solder tabs, a layer of 80Au20Sn can also be pre-plated on the surface of TiPtAu, so that the wavelength conversion body 41 can be sealed and welded directly with the casing 10 without adding materials, which can simplify the operation process and improve the consistency of the product. In other embodiments, of course, other sealing and fixing methods can also be used between the wavelength conversion body 41 and the casing 10 , such as low-temperature glass glue sealing.

The functional film layer 43 is disposed on the wavelength conversion body 41 , and the functional film layer 43 can be plated on the wavelength conversion body 41 . The functional film layer 43 corresponds to the first mounting hole 1311 to selectively transmit or reflect the incident laser light. As an example, the functional film layer 43 can transmit blue light (wavelength 420nm-470nm) with an incident angle within 16°, blue light (wavelength 420nm-470nm) and other fluorescence (wavelength 470nm-700nm) with an incident angle greater than 16° Reflection, transmittance and reflectance are based on the maximum values that can be achieved by the coating. Through research, the inventors found that, compared with those without the functional film layer 43, the light output of the light source device 1 coated with the functional film layer 43 is approximately doubled, which greatly improves the output light efficiency.

In this embodiment, the wavelength conversion body 41 includes a transparent body 411 and a phosphor 413 that are connected to each other.

The material of the transparent body 411 may be sapphire or other optical glass. In an embodiment, the transparent body 411 is circular. In other embodiments, the transparent body 411 may also be a square or other polygons.

The phosphor 413 corresponds to the functional film layer 43 , so that the laser light can be directly incident on the phosphor 413 after being transmitted by the functional film layer 43 . The size of the phosphor 413 may be consistent with the size of the laser spot incident on the phosphor 413, or may be larger than the size of the laser spot. The phosphor 413 may emit Lambertian light. The phosphor 413 is formed of phosphors and inorganic materials. The phosphors can be YAG phosphors with high heat resistance, or other phosphors such as LAG phosphors, α Sialon phosphors, etc. The correlated color temperature and color coordinate requirements of the white light to be output can be achieved by adjusting the content of the phosphor in the phosphor 413 and the thickness of the phosphor 413 in addition to the yellow and green phosphors with different emission spectra. Inorganic materials can be alumina ceramics with better thermal properties, or glass-like materials. The phosphor 413 may also be a fluorescent single crystal. The phosphor 413 formed of an inorganic material has better heat and light resistance and better reliability than the phosphor 413 formed of an organic material. In an embodiment, phosphor 413 is circular. In other embodiments, the phosphor 413 may also be a square or other polygons.

Referring to FIG. 8 , in other embodiments, the wavelength conversion element 40 can also be directly fired from phosphor powder, alumina ceramic powder and a binder that will volatilize during sintering. One side is polished and a functional film layer 43 is plated at the middle position, and a metal layer 45 is welded on the periphery of the functional film layer 43 . The wavelength conversion element 40 can also be formed into an integrated structure by uniformly mixing phosphor powder, alumina ceramic powder and a binder that will volatilize during sintering into a slurry, uniformly smearing it on the sapphire, and then sintering at high temperature.

Please continue to refer to FIG. 4 , the light source device 1 further includes a collecting lens 60 , and the collecting lens 60 is mounted on the second mounting surface 135 . By arranging the collecting lens 60, the use of the client is facilitated and the optical system and product production process of the client are simplified. The collection lens 60 can collect the Lambertian light from the phosphor 413 and output it at a specific angle, such as 120°, or other angles. The specific light output angle can be realized by different designs of the collection lens 60 according to actual needs. . In order to improve the collection efficiency of the collection lens 60, it can be realized by combining the improvement of the NA (Numerical Aperture, numerical aperture) value of the collection lens 60 and the diameter of the collection lens 60, which is specifically designed according to actual requirements. The collecting lens 60 can also be fixed on the second mounting surface 135 by using UV glue. Of course, other kinds of glues can also be used for fixing. In order to improve the light transmittance of the collecting lens 60 , two opposite optical surfaces of the collecting lens 60 may be coated with AR films in the full wavelength range of visible light (420nm-700nm) to reduce end surface reflection.

Please continue to refer to FIG. 1 and FIG. 2 , in this embodiment, the light source device 1 may further include pins 70 , the pins 70 are connected to the side board 13 , and the pins 70 and the side board 13 may be insulated and sealed by an insulator , the insulator can be made of low temperature glass material or ceramic material. The pin 70 can be used for an external power supply to power on the laser light source assembly 20 . In this embodiment, the number of the pins 70 is two, and the two pins 70 are installed on the same side of the side plate 13 .

To sum up, the light source device 1 provided by the present invention includes a casing 10 , a laser light source assembly 20 , a light guide assembly 30 and a wavelength conversion element 40 . The casing 10 is provided with a receiving cavity 11 , and the laser light source assembly 20 is installed in a plurality of receiving cavities 11 . Inside the stepped mounting surface 1612, the wavelength conversion element 40 converts the incident part of the laser light into the received laser light, and the received laser light and the unconverted laser light are combined to form white light and then emitted from the wavelength conversion element 40. The components 40 are packaged into one body, which reduces the volume of the light source device 1 and improves the integration degree of the light source device 1 .

Second Embodiment

Referring to FIG. 9 , the difference from the first embodiment is that this embodiment provides a light source device 2 . The laser light source elements 21 on two adjacent stepped mounting surfaces 1612 are disposed on opposite sides of the light guide assembly 30 . The fast-axis collimating lens 3212 , the slow-axis collimating lens 3214 and the reflective element 323 are also adjusted accordingly to ensure that the laser light emitted by each laser light source element 21 is collimated by the collimating lens 321 and reflected by the reflective element 323 When incident on the light homogenizing member 34, it is also coincident in the horizontal direction, and after being converged by the focusing lens 36, the laser beam can also be combined in the vertical direction, that is, the same beam effect as the first embodiment can be achieved.

To sum up, the light source device 2 provided by the present invention can disperse the heat emitted by the laser light source elements 21 by arranging the laser light source elements 21 on the two adjacent stepped mounting surfaces 1612 on opposite sides of the light guide assembly 30 . Under the same external heat dissipation conditions, heat dissipation can be more conducive to the heat dissipation of the laser light source element 21 and reduce the junction temperature of the laser light source element 21, which can not only improve the luminous efficiency of the laser light source element 21, increase the light output, but also improve the quality of the light source device 2. , prolonging the life of the light source device 2; or under the same junction temperature working conditions, the external heat dissipation conditions can be reduced, and the cost of the client products can be directly saved.

Third Embodiment

Please refer to FIG. 10 and FIG. 11 . The difference from the first embodiment is that this embodiment provides a light source device 3 . Each stepped mounting surface 31 includes a first stepped mounting surface 312 and a second stepped mounting surface 313 . The height of the second step mounting surface 313 on the step mounting surface 31 is greater than the height of the first step mounting surface 312, and the height difference between the second step mounting surface 313 and the first step mounting surface 312 on the same step mounting surface 31, It is advisable that the laser does not interfere in the vertical direction after being collimated by the fast axis. The height of the first step mounting surface 312 on the two adjacent step mounting surfaces 31 is greater than the height of the second step mounting surface 313, and the first step mounting surface 312 and the second step mounting surface on the two adjacent step mounting surfaces 31 The height difference of 313 is based on the fact that there is no interference in the vertical direction after the laser is reflected by the reflective element 33 . The first step mounting surface 312 is located between the second step mounting surface 313 and the light guide assembly 30 .

The laser light source assembly 35 includes multiple groups of laser light source elements 351, each group of laser light source elements 351 includes a first laser light source element 3512 and a second laser light source element 3514, wherein the first laser light source element 3512 is mounted on the first step mounting surface 312, The second laser light source element 3514 is mounted on the second step mounting surface 313 . In this embodiment, the number of the first step mounting surface 312 and the second step mounting surface 313 is three, and the number of the first laser light source element 3512 and the second laser light source element 3514 is both three.

The light guide assembly 30 in this embodiment includes multiple groups of slow-axis collimating lenses 37 , each group of slow-axis collimating lenses 37 is located between a group of laser light source elements 351 and the wavelength conversion element 39 , and each group of laser light source elements 351 has a The first laser light source element 3512 and the second laser light source element 3514 share one slow-axis collimating lens 37 .

11 and 12 , the slow-axis collimating lens 37 includes a first lens area 371 and a second lens area 372 arranged up and down, wherein the first lens area 371 is located on the first step mounting surface 312 and the second lens area 372 between.

10, 11 and 12, in this embodiment, the laser light emitted by the first laser light source element 3512 is incident on the wavelength conversion element 39 through the first lens region 371, and the laser light emitted by the second laser light source element 3514 is incident on the wavelength conversion element 39 through the first lens area 371. The two-lens region 372 is incident on the wavelength conversion element 39 . Since the first stepped mounting surface 312 is located between the second stepped mounting surface 313 and the light guide assembly 30, the first laser light source element 3512 is closer to the slow-axis collimating lens 37 than the second laser light source element 3514, that is, the first The optical paths of the laser light emitted by the laser light source element 3512 and the second laser light source element 3514 to the slow-axis collimating lens 37 are different, and there is an optical path difference. The distance D2 between the first laser light source element 3512 and the second laser light source element 3514 of each group of laser light source elements 351 is based on satisfying the heat dissipation requirements of the laser light source element 351, and the optical path difference between the two should be as small as possible. The light path of the light source device 3 is as short as possible to reduce light energy loss.

In this embodiment, the optical path of the laser light emitted by the first laser light source element 3512 is relatively short, so the first lens area 371 can be made into a mirror surface with a smaller focal length, for example, can be made into a concave-convex shape, and the collimation effect is the same as that of each group of laser light. The length dimension of the light spot incident on the reflection element 33 by the laser light emitted by the first laser light source element 3512 and the second laser light source element 3514 of the light source element 351 shall be the same. The laser light path emitted by the second laser light source element 3514 is relatively long, and the focal length of the second lens area 372 is greater than the focal length of the first lens area 371. For example, the second lens area 372 can be made into a plano-convex shape.

To sum up, in the light source device 3 provided by the present invention, the laser light source assembly 35 and the wavelength conversion element 39 are packaged together, the first laser light source element 3512 is mounted on the first step mounting surface 312, and the second laser light source element 3514 is mounted on the first step mounting surface 312. The two-step mounting surface 313 shortens the optical path length of the light source device 3 , reduces the volume of the light source device 3 , improves the integration degree of the light source device 3 , and makes the light source device 3 more competitive.

Fourth Embodiment

Please refer to FIG. 13 and FIG. 14 . Different from the first embodiment, this embodiment provides a light source device 4 . The mounting holes 431 in this embodiment are provided on the cover plate 44 .

In this embodiment, the light source device 4 further includes a laser reflector 46 , and the laser reflector 46 is disposed on the optical path of the laser light emitted through the light guide assembly 30 for reflecting the laser light to the wavelength conversion element 40 .

To sum up, in the light source device 4 provided by the present invention, the laser reflector 46 is arranged on the optical path of the laser light emitted by the light guide assembly 30 to reflect the laser light to the wavelength conversion element 40, thereby realizing the ejection mode of the light source device 4, In addition, the laser light source assembly 20 and the wavelength conversion element 40 are packaged into one body, which reduces the volume of the light source device 4 and improves the integration degree of the light source device 4 .

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

A light source device, characterized in that it includes:

a housing, the housing is provided with a receiving cavity, the housing includes a step mounting part, the step mounting part is located in the receiving cavity, and includes a plurality of steps, each of the steps includes a step mounting surface;

a laser light source assembly, the laser light source assembly is mounted on a plurality of the step mounting surfaces;

a light guide assembly, the light guide assembly is mounted on the step mounting portion, and guides the laser light emitted by the laser light source assembly to emit in a predetermined direction; and

A wavelength conversion element, the wavelength conversion element receives the laser light guided and emitted by the light guide assembly, and converts a part of the incident laser light into a received laser light, and the received laser light and the unconverted laser light are combined to form white light from the received laser light. The wavelength conversion element is emitted.
The light source device according to claim 1, wherein the housing comprises a bottom plate and a side plate connected to the bottom plate, the bottom plate and the side plate enclose the receiving cavity, and the step mounting portion It is arranged on the bottom plate, the side plate is provided with an installation hole communicating with the receiving cavity, and the wavelength conversion element is installed in the installation hole.
The light source device according to claim 2, wherein the side plate includes an inner surface located in the receiving cavity and a first mounting surface located in the mounting hole, and the mounting hole includes a communicating first mounting surface. an installation hole and a second installation hole, the diameter of the second installation hole is larger than that of the first installation hole, the first installation hole penetrates the inner surface and the first installation surface, and the wavelength conversion element mounted on the first mounting surface.
The light source device according to claim 3, wherein the wavelength conversion element comprises a wavelength conversion body, a functional film layer and a metal layer, and the functional film layer and the metal layer are both disposed on the wavelength conversion body, The metal layer surrounds the functional film layer, the functional film layer corresponds to the first mounting hole, and the wavelength conversion body is mounted on the first mounting surface through the metal layer.
The light source device according to claim 4, wherein the wavelength conversion body comprises a transparent body and a phosphor that are connected to each other, and the functional film layer and the metal layer are located on a part of the transparent body away from the phosphor. On one side, the phosphor corresponds to the functional film layer.
The light source device according to claim 3, wherein the installation hole further comprises a third installation hole communicated with the second installation hole, the third installation hole and the first installation hole are respectively located in the On both sides of the second installation hole, the diameter of the third installation hole is larger than that of the second installation hole, the light source device further includes a collecting lens, and the side plate further includes a second installation hole located in the installation hole surface, the second mounting hole penetrates the first mounting surface and the second mounting surface, and the collecting lens is mounted on the second mounting surface.
The light source device according to claim 1, wherein the housing comprises a bottom plate, a side plate and a cover plate, the cover plate is opposite to the bottom plate, and the side plate is connected to the bottom plate and the cover plate. Between the cover plates, the bottom plate and the side plate enclose the receiving cavity, the cover plate closes the receiving cavity, the step mounting part is arranged on the bottom plate, and the cover plate is provided with the an installation hole communicating with the accommodating cavity, the wavelength conversion element is installed in the installation hole, the light source device further includes a laser reflection member, and the laser reflection member is arranged on the optical path of the laser light emitted by the light guide assembly, for reflecting the laser light to the wavelength conversion element.
The light source device according to any one of claims 1-7, wherein the laser light source assembly comprises a plurality of laser light source elements, and the plurality of the laser light source elements are installed on the plurality of the step installations in a one-to-one correspondence. surface, and a plurality of the laser light source elements are arranged on the same side of the light guide assembly.
The light source device according to any one of claims 1-7, wherein the laser light source assembly comprises a plurality of laser light source elements, and the plurality of the laser light source elements are installed on the plurality of the step installations in a one-to-one correspondence. surface, and the laser light source elements on two adjacent stepped mounting surfaces are disposed on opposite sides of the light guide assembly.
The light source device according to any one of claims 1-7, wherein the laser light source assembly comprises a plurality of groups of laser light source elements, each group of laser light source elements comprises a first laser light source element and a second laser light source element, each Each of the step mounting surfaces includes a first step mounting surface and a second step mounting surface, the height of the second step mounting surface on each of the step mounting surfaces is greater than the height of the first step mounting surface, and the The first stepped mounting surface is located between the second stepped mounting surface and the light guide assembly, the first laser light source element is mounted on the first stepped mounting surface, and the second laser light source element is mounted on the first stepped mounting surface Second step mounting surface.
The light source device according to claim 10, wherein the light guide assembly comprises a plurality of groups of slow-axis collimating lenses, and each group of the slow-axis collimating lenses is located in a group of the laser light source elements and the wavelength conversion Between the elements, the slow-axis collimating lens includes a first lens area and a second lens area arranged up and down, the first lens area is located between the first step mounting surface and the second lens area, so The focal length of the second lens area is greater than the focal length of the first lens area, the laser light emitted by the first laser light source element is incident on the wavelength conversion element through the first lens area, and the second laser light source element emits The laser light is incident on the wavelength conversion element through the second lens area.
The light source device according to any one of claims 1-7, wherein the light guide assembly comprises a light homogenizer, a focusing lens and a plurality of groups of guide members, and each group of the guide members includes a collimating lens and a A reflecting element, the laser light is incident on the wavelength conversion element after being collimated by the collimating lens, reflected by the reflecting element, light homogenized by the light homogenizer, and focused by the focusing lens.