Fluorescence wavelength conversion module with efficient heat dissipation
By using the heat pipe to connect the fluorescent wave length converter and the external heat sink through the fluorescent wavelength conversion module, the problem of insufficient heat dissipation performance in the existing technology has been solved, the efficient heat dissipation and structural stability are realized, and the use environment of the equipment is expanded.
Patent Information
- Application Number
- CN202310908762.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-24
- Publication Date
- 2025-01-24
Smart Images
Figure CN119353635A_ABST
Abstract
Description
Technical Field
[0001] The present invention is a fluorescent wavelength conversion module with high heat dissipation efficiency, which can quickly conduct the heat generated by the fluorescent wavelength converter during operation to the outside to improve its performance, and is used in the technical fields of lighting and display using LED or laser diode as excitation light source. Background Art
[0002] Generally, the fluorescence wavelength conversion module is composed of a fluorescence wavelength converter and a heat sink. The fluorescence wavelength converter absorbs incident light of one or several wavelengths through the fluorescent material contained therein, and converts it into outgoing light of a wavelength different from the incident light after absorption, thereby achieving wavelength conversion of light. In a laser diode-based light source, the fluorescence wavelength converter converts the monochromatic blue light or other wavelengths emitted by the laser diode into white light. The conversion efficiency and other performance of the fluorescence wavelength converter directly affect the luminous efficiency, reliability and service life of this type of light source.
[0003] During the operation of the fluorescence wavelength converter, since its wavelength conversion efficiency is usually only about 80%, about 20% of the incident light energy will still be converted into heat. Especially when the incident light source is a high-power laser diode, in order to achieve high brightness, high range, and reduce the structural size of the white light shaping unit, the size of the incident light beam incident on the surface of the fluorescence wavelength converter is usually very small. For example, the incident light beam diameter can be as small as 0.2mm, and the optical power of the laser beam is as high as 5W. In this case, the surface energy density of the incident light on the fluorescence wavelength converter can be as high as 160W / mm 2 , high brightness also generates high heat. Therefore, a heat sink of sufficient size is required to dissipate the heat in a short time after it is exported to the heat sink in time.
[0004] The existing fluorescence wavelength converters are generally directly combined with the heat sink surface through thermal grease to help transfer heat from the fluorescence wavelength converter to the heat sink. Since the thermal grease contains a large amount of organic silicone grease with poor thermal conductivity, the overall thermal conductivity is limited. At the same time, the silicone grease is prone to aging, which will cause a sharp drop in thermal conductivity, and an additional mechanical structure is often required between the two to play a fixing role.
[0005] The fluorescence wavelength converter is directly fixed on the heat sink through thermal grease. In order to meet the power requirements for heat dissipation, the heat sink is often huge in size. As a result, when the output light generated by the fluorescence wavelength converter is subsequently optically shaped, the structure of the shaping part will be very large, which directly leads to the increase in the size of the installation structure required for the fluorescence wavelength converter, limiting the use environment of the fluorescence wavelength converter to a certain extent.
[0006] Therefore, it is necessary to have a more efficient and reliable thermal interface between the fluorescence wavelength converter and the heat sink, while reducing its structural constraints to adapt to more usage environments. Summary of the invention
[0006] The present invention aims to solve the problems in the prior art and proposes a fluorescence wavelength conversion module with high heat dissipation efficiency. The fluorescence wavelength converter is connected to an external heat sink through a heat pipe, which not only reduces the thermal resistance between the fluorescence wavelength converter and the heat sink, but also improves the reliability and stability of the thermal interface. It also separates the fluorescence wavelength conversion part from the heat sink, reducing the structural size restrictions on the position of the fluorescence wavelength converter.
[0007] The present invention is achieved through the following technical solutions:
[0008] The present invention proposes a fluorescent wavelength conversion module with high efficiency in heat dissipation, such as Figure 1 As shown, it is characterized in that it includes a fluorescence wavelength converter (101), a fluorescence wavelength converter base (102), a heat pipe (103), and an external heat sink (104) which are arranged in sequence. Monochromatic incident light is incident on the fluorescence wavelength converter, absorbed by it and converted into light of another wavelength before being emitted. The heat generated during the conversion will be conducted to the heat pipe through the base, and then quickly conducted by the heat pipe to the external heat sink and dissipated outward.
[0009] The fluorescent wavelength conversion module with high heat dissipation efficiency is characterized in that the fluorescent wavelength converter, the fluorescent wavelength converter base, the heat pipe, and the external heat sink are all connected to each other by welding, thereby ensuring that all components have low thermal resistance, high thermal conductivity, high heat dissipation, and a stable structure.
[0010] Furthermore, the thermally conductive substrate of the fluorescence wavelength converter is made of copper or copper alloy, which not only has excellent thermal conductivity and heat dissipation properties, but also has good welding properties.
[0011] Furthermore, the color temperature of the fluorescent wavelength converter is between 4000K and 10000K.
[0012] Furthermore, the fluorescence wavelength converter has a thickness between 0.5 mm and 5 mm.
[0013] Furthermore, the fluorescent wavelength converter has an area with a fluorescent layer generally less than 25 mm 2 .
[0014] Furthermore, the fluorescent wavelength converter base is entirely made of copper or copper alloy, and serves to connect the heat pipe and the fluorescent wavelength converter by welding.
[0015] Furthermore, the heat pipe is sealed and wrapped by copper or copper alloy on the outside and contains coolant on the inside, which makes it have better thermal conductivity than ordinary single metal materials and has good plasticity and welding properties.
[0015] Furthermore, the heat pipe has a diameter between 3 mm and 6 mm, and a length between 30 mm and 200 mm.
[0016] Furthermore, the external heat sink can be made entirely of copper or copper alloy, etc., and can have good welding properties and be fully connected to the heat pipe.
[0017] Furthermore, the rear surface of the external heat sink can be cut to form heat sink fins to increase the heat dissipation area, thereby improving the heat dissipation performance.
[0018] The present invention has the following beneficial effects:
[0019] (1) Good thermal conductivity and heat dissipation performance: The entire device does not include any organic material components with poor thermal conductivity and heat dissipation. The fluorescence wavelength converter, the fluorescence wavelength converter base, the heat pipe, and the external heat sink can be tightly and reliably connected by simple welding. (2) Excellent structural stability: All components of the device are made of inorganic materials with excellent mechanical properties and heat resistance, thus ensuring the stability of the structure. (3) Performance stability: Good thermal conductivity, heat dissipation and structural stability of the device ensure the stability of the optical performance of the entire device. (4) Wide range of applications: The entire device is integrated into one, but the light-emitting part of the fluorescence wavelength converter is not directly attached to the heat sink, which reduces the problem of limited use environment of the fluorescence wavelength conversion module due to the large mechanical size of the heat sink. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 The overall schematic diagram of the fluorescence wavelength conversion module of the present invention is shown in FIG. 1 , wherein (101) is a fluorescence wavelength converter, (102) is a base of the fluorescence wavelength converter, (103) is a heat pipe, and (104) is an external heat sink.
[0021] Figure 2 The schematic diagram is a schematic diagram of the path of heat generated and transmitted outward when the fluorescence wavelength converter realizes wavelength conversion during the working process of the present invention. Among them, (201) is the fluorescence wavelength converter, (202) is the base of the fluorescence wavelength converter, (203) is the heat pipe, (204) is the external heat sink, and (205) is a schematic diagram of the transmission path of the heat generated by the wavelength converter. DETAILED DESCRIPTION
[0022] The following are specific embodiments of the present invention and are combined with the attached Figure 2 , the technical solution of the present invention is further described. However, the present invention is not limited to these embodiments.
[0023] Follow these steps to build a fluorescence wavelength conversion module with efficient heat dissipation:
[0024] (1) First, a copper sheet with a thickness of 3 mm and a side length of 10 mm is selected as the fluorescence wavelength converter base (202), and its two planes can be connected to the fluorescence wavelength converter and the heat pipe respectively.
[0025] (2) A square fluorescence wavelength converter (201) with a thickness of 2 mm and a side length of 4 mm is welded and installed by soldering after cleaning the welding surfaces of the fluorescence wavelength converter and the welding base.
[0026] (3) A copper external heat sink (204) with an external dimension of 100 mm*100 mm*30 mm and 50 heat sink fins is selected.
[0027] (4) A heat pipe (203) with a diameter of 3 mm and a length of 100 mm is selected, and its two ends are flattened and bent by 10 mm each to the state shown in the figure, and the flattened two ends are respectively welded to the base of the fluorescence wavelength converter and the external heat sink by welding.
[0028] Figure 2 In the fluorescent wavelength conversion module with high efficiency heat dissipation, each working component is welded to each other. When the fluorescent wavelength converter is working, the heat generated by it is transferred to the heat pipe by heat conduction within a very short distance, and is quickly transferred to the external radiator under the high efficiency thermal conductivity of the heat pipe, and dissipated from the surface of the heat dissipation sheet of the external radiator, thereby achieving the purpose of efficient heat dissipation.
[0028] Figure 2 The fluorescent wavelength conversion module with medium and high efficiency heat dissipation has a fluorescent wavelength converter with a very small size, which is welded on a welding base and a heat pipe of the same small size. In contrast, the volume of the external heat sink is very large. Therefore, compared with the light-emitting module that directly fixes the fluorescent wavelength converter to the surface of the heat sink, the present invention can effectively reduce the size limitation of the fluorescent wavelength converter, thereby improving the application scope of the fluorescent wavelength conversion module.
[0029] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.
Claims
1. A fluorescence wavelength conversion module capable of rapid heat dissipation, characterized in that: The invention comprises a fluorescence wavelength converter, a fluorescence wavelength converter base, a heat pipe and an external radiator which are arranged in sequence.
2. The fluorescent wavelength conversion module capable of rapid heat dissipation according to claim 1, characterized in that: The heat-conducting substrate of the fluorescence wavelength converter is made of copper or copper alloy.
3. The fluorescent wavelength conversion module capable of rapid heat dissipation according to claim 1, characterized in that: The color temperature of the fluorescent wavelength converter is between 4000K and 10000K.
4. The fluorescence wavelength conversion module capable of rapid heat dissipation according to claim 1, characterized in that: The thickness of the fluorescence wavelength converter is between 0.5 mm and 5 mm.
5. The fluorescent wavelength conversion module capable of rapid heat dissipation according to claim 1, characterized in that: The area of the fluorescent layer of the fluorescent wavelength converter is less than 25 mm 2 .
6. The fluorescence wavelength conversion module capable of rapid heat dissipation according to claim 1, characterized in that: The fluorescence wavelength converter base is entirely made of copper or copper alloy.
7. The fluorescence wavelength conversion module capable of rapid heat dissipation according to claim 1, characterized in that: The heat pipe is sealed and wrapped with copper or copper alloy on the outside and contains cooling liquid on the inside.
8. The fluorescent wavelength conversion module capable of rapid heat dissipation according to claim 1, characterized in that: The material of the external heat sink can be copper or copper alloy.
9. The fluorescent wavelength conversion module capable of rapid heat dissipation according to claim 1, characterized in that: The rear surface of the external heat sink is cut to form a heat sink.
10. The fluorescent wavelength conversion module capable of rapid heat dissipation according to claim 1, characterized in that: The fluorescence wavelength converter, the fluorescence wavelength converter base, the heat pipe and the external radiator are connected by welding.