WO2022116631A1

WO2022116631A1 - Light source device

Info

Publication number: WO2022116631A1
Application number: PCT/CN2021/117679
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: CN114578575A

Abstract

A light source device. The light source device comprises: a tube housing (11), a transparent cover plate (12) covering the tube housing (11), a wavelength conversion device (4), a light source module (2) and an annular reflection member (3), wherein a sealed space is defined by the tube housing (11) and the transparent cover plate (12); the wavelength conversion device (4) is arranged on the transparent cover plate (12); the light source module (2) is located in the sealed space and used for emitting light beams; and the annular reflection member (3) is located in the sealed space, comprises an annular reflection surface (31) and is used for reflecting the light beams to the wavelength conversion device (4). The light beams emitted by the light source module (2) are reflected to the wavelength conversion device (4) by means of the annular reflection member (3), circular light spots in Gaussian distribution can be formed, and the light source device has a simple structure and is small in size.

Description

a light source device

technical field

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

Background technique

With the development of science and technology, light sources that generate white light through lasers and phosphors have been widely used in lighting and display fields.

For the method of integrating multiple lasers to excite phosphors to emit white light, most of them use multiple laser chips to package independently, then perform light integration, and finally excite the phosphors to generate white light. This kind of product has a complex structure and a large volume. In addition, there are also some products that collimate and shape the laser at the same time, but they require many optical components and complex structures, which do not meet the requirements of small-size packaging.

SUMMARY OF THE INVENTION

The main technical problem to be solved by the present application is to provide a light source device with simple structure, small size and high brightness.

In order to solve the above technical problems, a technical solution adopted in the present application is to provide a light source device, the light source device includes: a tube shell and a transparent cover plate covered on the tube shell, and the tube shell and the transparent cover plate form a sealed space; The wavelength conversion device is arranged on the transparent cover plate; the light source module is located in the sealed space and is used to emit light beams; the annular reflector is located in the sealed space and includes a ring-shaped reflection surface for reflecting the light beams to the wavelength conversion device .

Further, the annular reflection member is in the shape of a prism, and the annular reflection surface includes a plurality of sub-reflection surfaces connected in sequence.

Further, the annular reflecting surface is arc-shaped.

Further, the annular reflection surface is stepped, and includes a first reflection surface and a second reflection surface, wherein the first reflection surface and the second reflection surface are arranged at an obtuse angle.

Further, the annular reflector also includes: a lower bottom surface, connected to one end of the annular reflective surface, and fixed on the bottom wall of the tube shell, wherein the angle between the annular reflective surface and the lower bottom surface is an acute angle; the platform surface, Connect the other end of the annular reflector.

Further, the distance range between the light source module and the annular reflector is: 0.18mm-0.22mm, the vertical distance between the platform surface and the lower bottom surface of the annular reflector is: 0.8mm-1.2mm, the annular reflector The included angle with the lower bottom surface ranges from 25° to 35°.

Further, the light source module includes a plurality of light-emitting units, and the plurality of light-emitting units are arranged at equal intervals around the annular reflector.

Further, the wavelength conversion device includes ceramic paste and phosphor powder coated on the transparent cover plate.

Further, the inner surface of the bottom wall of the tube shell is provided with a first metal film layer distributed at intervals, the outer surface of the bottom wall of the tube shell is provided with a second metal film layer distributed at intervals, and the bottom wall of the tube shell is also provided with a second metal film layer distributed at intervals. A wire connecting the first metal film layer and the second metal film layer is provided.

Further, the tube shell includes a bottom wall and a side wall, the bottom wall is connected with the side wall, and the connection between the bottom wall and the side wall has a gap.

The beneficial effects of the embodiments of the present application are: the light source device of the present application includes a tube shell and a transparent cover plate covered on the tube shell, a wavelength conversion device, a light source module and a ring-shaped reflector. Wherein, the tube shell and the transparent cover plate form a sealed space, the wavelength conversion device is arranged on the transparent cover plate, and the light source module and the annular reflector are located in the sealed space to realize the encapsulation of the light source device. The number of optical components is small, the packaging structure is simple, the packaging process can be reduced, the cost of the light source device can be reduced, and the volume is small. In addition, the light source module is used to emit light beams, and the light beams are reflected to the wavelength conversion device through the annular reflector, which can form a circular light spot with an approximate Gaussian distribution, which can improve the brightness of the light source device and meet the requirements of back-end applications.

Description of drawings

1 is a schematic structural diagram of an embodiment of a light source device provided by the present application;

2 is a schematic structural diagram of an embodiment of an annular reflector in a light source device provided by the present application;

Fig. 3 is the top view schematic diagram of the tube shell in Fig. 1;

4 is a schematic structural diagram of another embodiment of the annular reflector in the light source device provided by the present application;

5 is a schematic structural diagram of another embodiment of the annular reflector in the light source device provided by the present application;

6 is a schematic structural diagram of a light spot formed when the light source module is not subjected to optical processing;

7 is a schematic diagram of the illuminance distribution when the light source module is not subjected to optical processing;

8 is a schematic structural diagram of a light spot formed by a light source device provided in the present application;

9 is a schematic diagram of the illuminance distribution of the light source device provided by the present application;

Fig. 10 is the top view schematic diagram of the transparent cover plate in Fig. 1;

Fig. 11 is the bottom view schematic diagram of the light source device in Fig. 1;

Fig. 12 is the bottom view schematic diagram of the transparent cover plate in Fig. 1;

13 is a schematic structural diagram of another embodiment of a light source device provided by the present application;

FIG. 14 is a schematic cross-sectional view of the light source device in FIG. 13 .

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

The present application provides a light source device, which can be applied to the current shell-and-tube laser packaging. The light source has a simple structure, is easy to package, has a small volume, and has low cost, and the light source device has high brightness and light output. efficiency.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of an embodiment of a light source device provided by the present application. The light source device includes: a tube shell 11, a transparent cover 12 covered on the tube shell 11, a wavelength conversion device 4, a light source mold Group 2 and annular reflector 3.

Specifically, the tube shell 11 and the transparent cover plate 12 form a sealed space, and the light source module 2 and the annular reflector 3 are both located in the sealed space. The tube shell 11 includes a bottom wall 111 and a side wall 112 connected to the bottom wall 111 , and the transparent cover plate 12 is disposed opposite to the bottom wall 111 . Wherein, the transparent cover plate 12 can be made of optical glass, sapphire and other materials.

The light source module 2 is used to emit light beams. The light source module 2 may be a solid light source such as a semiconductor laser chip or a light emitting diode chip. Preferably, the light source module 2 may be a blue laser chip with a wavelength range of 430nm-480nm. Since the blue light has the shortest wavelength, the other two primary colors are most easily excited, and the brightness of the light source can be improved.

Optionally, an optical component (not shown in the figure) may also be arranged between the light source module 2 and the annular reflector 3 , and the optical component may be used to shape the light beam emitted by the light source module 2 . For example, when the light source module 2 is a semiconductor laser chip, the light it emits is laser light, because the light emitted by the laser has a long axis and a short axis. By adding this optical component to shape the light beam, the light beam can pass through the annular reflector. 3 and hits the wavelength conversion device 4 into an approximate circular shape after reflection.

Further, the light source module 2 includes a plurality of light emitting units 21. The light emitting units 21 may include a chip part (not shown) and a heat sink part (not shown), and the heat sink part is connected to the chip part to dissipate heat from the chip. The heat sink portion of the light-emitting unit 21 is fixed on the bottom wall 111 of the casing 11, and can be fixedly connected to the inner surface of the bottom wall 111 by eutectic welding, nano-silver paste sintering, gold glue sintering, etc., and conduct heat. . Preferably, the light-emitting unit 21 and the bottom wall 111 can be connected by gold glue sintering, which has high thermal conductivity, stable performance and high reliability.

As shown in FIG. 1 , the annular reflection member 3 includes an annular reflection surface 31, and the annular reflection surface 31 is used to reflect the light beam emitted by the light source module 2 to the wavelength conversion device 4, wherein the wavelength conversion device 4 is arranged on the transparent cover on board 12. The plurality of large light-emitting units 21 in the light source module 2 are arranged at intervals around the annular reflector 3, and the light beams emitted by the plurality of light-emitting units 21 are reflected by the annular reflector 3 to the wavelength conversion device 4, which can form a circle with an approximate Gaussian distribution. Shape the light spot, improve the brightness of the light source, and make the light source meet the needs of back-end applications.

In one embodiment, as shown in FIG. 2 , FIG. 2 is a schematic structural diagram of an embodiment of the annular reflector 3 in the light source device provided by the present application, and the annular reflector 3 may be in the shape of a pyramid. The annular reflection surface 31 includes a plurality of sub-reflection surfaces 311 connected in sequence, and the number of the sub-reflection surfaces 311 is multiple, for example, 6, 5, or 8, etc., can be selected and set according to the actual situation.

As shown in FIG. 3 , a plurality of light emitting units 21 may be arranged around the annular reflector 3 at equal intervals. For example, when the annular reflector 3 is in the shape of a pyramid, each sub-reflection surface 311 may correspond to one light-emitting unit 21 . In a specific embodiment, the annular reflector 3 includes six sub-reflection surfaces 311 connected in sequence, and six light-emitting units 21 are also provided. The six light-emitting units 21 are evenly arranged on the periphery of the annular reflector 3, and each The reflection surface 311 corresponds to one light-emitting unit 21 .

In another embodiment, as shown in FIG. 4 , FIG. 4 is a schematic structural diagram of another embodiment of the annular reflector 3 in the light source device provided by the present application. The reflection surface 31 is arc-shaped. The arc-shaped annular reflection surface 31 has strong pressure resistance and is convenient for production. In addition, the arc-shaped annular reflective surface 31 has reflective surfaces in all directions, a plurality of light sources 21 can be arranged around the annular reflective member 3 at intervals, and the spacing between adjacent light sources 21 can be equal or unequal. Light beams can be reflected. In this way, the structure of the light source device is simple and the reliability is high.

In yet another embodiment, as shown in FIG. 5 , FIG. 5 is a schematic structural diagram of another embodiment of the annular reflection member 3 in the light source device provided by the present application. In this embodiment, the annular reflection surface 31 may also be stepped. Specifically, the annular emission surface 31 may include a first reflection surface 301 and a second reflection surface 302 connected to each other, wherein the first reflection surface 301 and the second reflection surface 302 are arranged at an obtuse angle. The second reflecting surface 302 is arranged at an acute angle with the bottom wall 11 of the casing 11 , the first reflecting surface 301 is connected to the second reflecting surface 302 , and the two are arranged at an obtuse angle. This arrangement prevents the first reflection surface 301 from affecting the light beam reflected by the second reflection surface 302 , so that the light beam reflected by the first reflection surface 301 and the second reflection surface 302 can be emitted to the wavelength conversion device 4 . It should be noted that, for some special application scenarios, the annular reflecting surface may also include multiple groups of reflecting surfaces, for example, including a first reflecting surface, a second reflecting surface and a third reflecting surface, wherein the first reflecting surface may be a plane The reflective surface or arc-shaped reflective surface, the second reflective surface can be a flat reflective surface or an arc-shaped reflective surface, and the third reflective surface can be a flat reflective surface or an arc-shaped reflective surface, which will not be described here. The annular reflective surfaces formed by splicing the reflective surfaces all belong to the protection scope of the present application.

Further, in all the above embodiments, the annular reflection surface 31 may be coated with a reflection film to realize the function of reflecting the light beam. Preferably, the annular reflective surface 31 may be a highly reflective coating surface to improve the reflectivity of the annular reflective surface 31 . The reflectivity of the high-reflection coating surface is greater than the first preset threshold. The first preset threshold value can be selected and set according to the actual situation. When the reflectivity of the high-reflection coating surface is greater than the first preset threshold value, the high-reflection coating surface basically reflects the incident light, so that the ring-shaped reflective surface will be reflected. The reflectivity of 31 can reach more than 99%.

Further, in some embodiments, as shown in FIGS. 2 , 4 and 5 , the annular reflector 3 may further include: a lower bottom surface 33 and a platform surface 32 .

The lower bottom surface 33 is connected to one end of the annular reflective surface 31 and is fixed on the inner surface of the bottom wall 111 of the casing 11 , wherein the angle between the annular reflective surface 31 and the lower bottom surface 33 is an acute angle, so that the reflective surface 31 The light beam can be reflected onto the wavelength conversion device 4 . The lower bottom surface 33 can be directly bonded to the bottom wall 111 of the tube shell 11 , for example, the lower bottom surface 33 can be fixed on the bottom wall 111 of the tube shell 11 by high temperature resistant glue. In other embodiments, the lower bottom surface 33 can also be welded to the bottom wall 111 of the tube shell 11 , for example, by plating the lower bottom surface 33 with gold, and then fixing by welding, gold glue, or silver paste.

The platform surface 32 is connected to the other end of the annular reflection surface 31 , and the platform surface 32 is opposite to the lower bottom surface 33 . The platform surface 32 can be a smooth plane, which is convenient for the suction nozzle to pick up, so as to facilitate the precise positioning of the prismatic reflecting surface 31 .

It can be understood that, in some embodiments, the annular reflector 3 may only be provided with the lower bottom surface 33 without the platform surface 32, or the annular reflector 2 may also be provided with only the platform surface 32 without the lower bottom surface 33, etc. , to adapt to different application scenarios.

If the light beam emitted by the light emitting unit 21 is not subjected to optical processing, the formed light spot is generally not uniform. For example, the light emitted by a semiconductor laser chip generally has a long axis and a short axis. If the light beam is not processed, the light spot at a distance of 1.5mm from it is shown in Figure 6. The light spot is generally elliptical, as shown in Figure 7. The uneven illuminance distribution of the axis 10 and the short axis 20 affects the brightness and performance of the light source device.

By reasonably setting the distance between the light source module 2 and the annular reflector 3 and the size of the annular reflector 3, a circular spot with a Gaussian distribution of a certain size can be generated. Specifically, the range of the distance between the light source module 2 and the annular reflector 3 can be: 0.18mm-0.22mm, preferably 0.2mm, the vertical distance between the platform surface 32 of the annular reflector 3 and the lower bottom surface 33 It can be: 0.8mm-1.2mm, preferably 1mm, and the angle between the annular reflective surface 31 and the lower bottom surface 33 can be in the range of 25°-35°, preferably 30°. Specifically, the inclination angle of the annular reflection surface 31 can be designed according to the positions of the light source module 2 and the wavelength conversion device 4, so that the light beam emitted by the light source module 2 is reflected by the annular reflection surface 31 and then hits the wavelength conversion device 4. As shown in FIG. 8, the circular light spot with approximate Gaussian distribution is obtained by superimposing the light beams emitted by multiple light sources 21. As shown in FIG. 9, the illuminance in the long axis 10 direction and the short axis 20 direction of the light spot is almost Consistent. In this way, there is no need to use other optical components to shape the light beams emitted from each light-emitting unit 21 , which simplifies the structure of the light source device and saves production costs.

The light beam emitted by the light source module 2 is sent to the wavelength conversion device 4 through the annular reflector 3 to excite fluorescence, and the remaining unexcited light beam and fluorescence can be synthesized into white light that meets the requirements of back-end applications.

For different brightness requirements, the number of light-emitting units 21, the size of the annular reflector 3 and the position and size of the wavelength conversion device 4 can be adjusted according to the actual situation, so that the light beam emitted by the light source module 2 is reflected on the annular reflecting surface 31, The light beam will not hit the outside of the annular reflection surface 31, and then combined into a circular light spot with approximately Gaussian distribution with a bright center and a dark edge.

Preferably, in some embodiments, an optical element for processing the long axis or the short axis can be arranged between the light source module 2 and the annular reflector 3 to prevent a part of the light beam from hitting the annular reflector 3 and thus preventing the loss, so as to improve the light utilization rate of the light source module 2 .

That is, in the above embodiment, the light beam emitted by the light source module 2 is reflected by the annular reflector 3 to the wavelength conversion device 4 and can be synthesized into a circular light spot with an approximate Gaussian distribution. The wavelength conversion device 4 can be used to excite the fluorescence, so that the excited fluorescence can meet the white light required by the back-end application.

Further, as shown in FIG. 10 , FIG. 10 is a schematic top view of the transparent cover plate 12 in FIG. 1 . The wavelength conversion device 4 is arranged on the transparent cover plate 12 . Specifically, the wavelength conversion device 4 may include ceramic paste and phosphor powder coated on the transparent cover plate 12 . The phosphor powder and ceramic powder slurry can be coated on the transparent cover plate 12 to form the wavelength conversion device 4 . Scattering particles may also be added to the wavelength conversion device 4 for light diffusion, and then the wavelength conversion device 4 may be formed by sintering them together. In this way, the wavelength conversion device 4 has a simple structure and low production cost. In other embodiments, the wavelength conversion device 4 can also be produced separately, and then the wavelength conversion device 4 can be bonded to the transparent cover plate 12 , which can improve the production efficiency of the light source device.

It can be understood that white light with a desired color temperature can be obtained by adjusting the type, concentration, thickness and concentration of scattering particles of the phosphors in the wavelength conversion device 4 .

The shape of the wavelength conversion device 4 is any of a circle, a square, a rectangle or an ellipse. The specific settings can be selected according to the actual situation. Preferably, the wavelength conversion device 4 can be circular, which corresponds to the shape of the light spot and can improve the light extraction rate of the light source device.

The wavelength conversion device 4 may be located on a side surface of the transparent cover plate 12 away from the sealed space. In other implementations, the wavelength conversion device 4 can also be disposed on the surface of the transparent cover 12 close to the sealed space. In this way, the wavelength conversion device 4 can be sealed in the sealed space and the wavelength conversion device 4 can be protected from dust. Protection, reducing the influence of dust on the light conversion rate of the wavelength conversion device 4 .

The annular reflector 3 reflects the light beam and outputs it to the wavelength conversion device 4 . Optionally, an optical film layer (not shown) can be coated on the light incident surface of the wavelength conversion device 4, and the optical film layer can transmit the light beam emitted by the light source module 2 and reflect the fluorescence excited by the wavelength conversion device 4, thereby avoiding fluorescence. Enter into the inside of the casing 11 to reduce the luminous flux of the light.

In order to further prevent the light beam hitting the wavelength conversion device 4 (such as a blue laser with a wavelength of 430-470 nm) from being reflected back into the sealed space and reduce the excitation efficiency, the optical film layer on the wavelength conversion device 4 can adjust the incident angle at a preset threshold value. The light beam is transmitted within the range, and the light beam whose incident angle is greater than the preset threshold value is reflected, wherein the preset threshold value can be 45°, 30°, or 55°, etc. In this way, the light beam can excite the phosphor to a greater extent, thereby emitting high-brightness white light.

In this embodiment, the bottom wall 111 and the side wall 112 of the tube shell 11 can be made of the same material and integrally formed to simplify the manufacturing process. Optionally, both the bottom wall 111 and the side wall 112 of the tube case 11 may be made of ceramic materials with high thermal conductivity. For example, aluminum nitride, silicon carbide, polycrystalline diamond ceramics, beryllium oxide, etc. In other embodiments, the material of the tube shell 11 is also metal, such as copper or silver.

When the material of the tube shell 11 is ceramic, the inside of the tube shell 11 can be plated with metal, so as to facilitate the mounting of the light source module 2, wherein the part of the side wall 112 of the tube shell 11 in contact with the transparent cover 12 can also be plated with metal, In order to improve the overall packaging effect of the light source. The tube shell 11 can be primed with titanium or platinum during metal plating.

As shown in FIG. 3 , the inner surface of the bottom wall 111 of the package 11 may be provided with first metal film layers 114 distributed at intervals to facilitate the mounting of the light source module 2 . As shown in FIG. 11 , the bottom of the package 11 The outer surface of the wall 111 is provided with a second metal film layer 115 distributed at intervals, and the bottom wall 111 of the tube shell 11 is also provided with a wire (not shown) connecting the first metal film layer 114 and the second metal film layer 115 . The first metal film layer 114 forms one bonding pad inside the package 11 , and the second metal film layer 115 forms another bonding pad outside the package 11 . The material of the first metal film layer 114 and the second metal film layer 115 may be gold, silver, copper, or the like. The wire may preferably have a thermal expansion coefficient close to that of a ceramic metal and a metal with a lower resistivity, such as the metal tungsten. The light source 21 can be soldered to the first metal layer 114 by metal wires, and electrically connected to the external second metal film layer 115 by wires, and the current input and heat transfer can be accomplished by soldering to the printed circuit board.

In order to improve the airtightness of the light source device, as shown in FIG. 3 , a first metal connection layer 113 may be provided at the position where the side wall 112 of the package 11 is in contact with the transparent cover 12 . For example, the material of the first metal connection layer 113 may be Metals such as gold or silver. As shown in FIG. 12 , the second metal connection layer 121 may be provided at the position where the transparent cover 12 contacts the casing 11 . This arrangement facilitates the encapsulation of the casing 11 and the transparent cover 12 .

The shell 11 of the present embodiment adopts a ceramic material with high thermal conductivity, which is low in cost and can improve the reliability of the light source. The side wall 112 and the bottom wall 111 of the tube shell 11 are integrally formed, which is convenient for manufacture. In addition, the light beam emitted by the light source module is reflected to the wavelength conversion device 4 through the annular reflector 3, and a circular light spot with an approximate Gaussian distribution can be synthesized. In this way, the brightness of the light source device can be improved to meet the requirements of back-end applications.

The present application also provides a light source device of another embodiment, please refer to FIG. 13 and FIG. 14 , FIG. 13 is a schematic structural diagram of another embodiment of the light source device provided by the present application, and FIG. 14 is a cross-section of the light source device in FIG. 13 . Schematic diagram, different from the previous embodiment, in this embodiment, the side wall 112 and the bottom wall 111 of the tube shell 11 can be provided separately, and the bottom wall 111 of the tube shell 11 is connected to the side wall 112 .

Optionally, the side wall 112 and the bottom wall 111 of the tube shell 11 can be made of different materials, for example, the side wall 112 of the tube shell 11 can be made of ceramic material, and the bottom wall 111 of the tube shell 11 can be made of metal material. The ceramic material may be a general ceramic material such as alumina, so as to save the production cost. The side wall 112 of the tube case 11 may also be made of a high thermal conductivity ceramic material, such as aluminum nitride or silicon carbide, so as to improve the thermal conductivity of the tube case 11 .

The bottom wall 111 of the tube case 11 can be made of a metal material with high thermal conductivity, such as copper or tungsten-copper alloy. In this way, the bottom wall 111 of the case 11 can be used as a heat conductor to conduct heat for the light source device.

The bottom wall 111 of the tube shell 11 is connected to the side wall 112 , and preferably, there is a gap at the connection between the bottom wall 111 and the side wall 112 . By arranging the gap, the bottom wall 111 can avoid mechanical failures such as cracking and deformation of the tube shell 11 due to thermal expansion.

As shown in FIG. 14 , a connecting material 117 can be used to connect the bottom wall 111 and the side wall 112 of the tube shell 11, and the connecting material 117 is partially arranged between the bottom wall 111 and the side wall 112 of the tube shell 11, and makes the bottom wall 111 and the side wall 112. A certain gap can be left between the wall 111 and the side wall 112 . Optionally, the bottom wall 111 and the side wall 112 of the tube shell 11 may be hermetically sealed by brazing or soldering.

In order to facilitate the connection between the bottom wall 111 and the side wall 112, a groove can be provided on the side of the side wall 112 away from the transparent cover 12, the bottom wall 111 is located in the groove, the inner surface of the bottom wall 111 and the side surface of the bottom wall 111 Connection materials 117 are provided at the positions connected to the side walls 112 , so that the tube shell 11 has better air tightness and the sealing reliability of the tube shell 11 is improved.

Optionally, in order to facilitate the encapsulation of the light source module 2, a step 116 is formed on the side wall 112 of the tube casing close to the bottom wall 111, and the metal wire of the light emitting unit 21 can be directly hit on the step 116, simplifying the process. packaging process. In other embodiments, the step 116 may not be provided on the side wall 112 of the tube shell 11 to simplify the manufacturing process of the tube shell.

The undescribed structures such as the wavelength conversion device 4 , the annular reflector 3 , and the transparent cover 12 in this embodiment are the same as those in the previous embodiment, and will not be repeated here. This embodiment only describes points of difference from the previous embodiment.

In the light source device of this embodiment, a gap is provided at the connection between the bottom wall 111 and the side wall 112 of the tube shell 11, which can effectively prevent the tube shell 11 from cracking due to thermal expansion and improve the reliability of the light source device. The bottom wall 111 and the side wall 112 of the tube shell 11 can be made of different materials as required, which can save production costs.

The above description is only an embodiment of the present application, and is not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied to other related technologies Fields are similarly included within the scope of patent protection of this application.

Claims

A light source device, characterized in that the light source device comprises:

a tube shell and a transparent cover plate covered on the tube shell, the tube shell and the transparent cover plate form a sealed space;

a wavelength conversion device, arranged on the transparent cover;

a light source module, located in the sealed space, for emitting a light beam;

The annular reflection member, located in the sealed space, includes an annular reflection surface for reflecting the light beam to the wavelength conversion device.
The light source device according to claim 1, wherein the annular reflection member is in the shape of a prism, and the annular reflection surface includes a plurality of sub-reflection surfaces connected in sequence.
The light source device according to claim 1, wherein the annular reflection surface is arc-shaped.
The light source device according to claim 1, wherein the annular reflective surface is stepped, comprising a first reflective surface and a second reflective surface, wherein the first reflective surface and the second reflective surface are formed Obtuse angle setting.
The light source device according to any one of claims 1-4, wherein the annular reflector further comprises:

a lower bottom surface, connected to one end of the annular reflection surface, and fixed on the bottom wall of the tube shell, wherein the included angle between the annular reflection surface and the lower bottom surface is an acute angle;

The platform surface is connected to the other end of the annular reflection surface.
The light source device according to claim 5, wherein the distance between the light source module and the annular reflector is in the range of 0.18 mm to 0.22 mm, and the platform surface of the annular reflector The vertical distance between the lower bottom surfaces is: 0.8mm-1.2mm, and the angle between the annular reflective surface and the lower bottom surface ranges from 25° to 35°.
The light source device according to claim 1, wherein the light source module comprises a plurality of light-emitting units, and the plurality of light-emitting units are arranged at equal intervals around the annular reflector.
The light source device according to claim 1, wherein the wavelength conversion device comprises ceramic paste and phosphor powder coated on the transparent cover.
The light source device according to claim 1, wherein the inner surface of the bottom wall of the tube case is provided with first metal film layers distributed at intervals, and the outer surface of the bottom wall of the tube case is provided with spacers A distributed second metal film layer, and a wire connecting the first metal film layer and the second metal film layer is also arranged in the bottom wall of the tube shell.
The light source device according to claim 1, wherein the tube case comprises a bottom wall and a side wall, the bottom wall is connected with the side wall, and the connection between the bottom wall and the side wall has a gap .