LED street lamp module

Abstract

The utility model provides an LED street lamp module, each light source substrate is arranged on a corresponding heat dissipation area through a first positioning part, a heat isolation area is arranged between every two adjacent heat dissipation areas, each heat dissipation area corresponds to one light source substrate, and each heat dissipation area corresponds to one light source substrate. Each light source substrate is independently cooled through the corresponding heat dissipation area, and is physically separated through the heat isolation area, so that the heat interference between the light source substrates is reduced, and the heat diffusion path is increased; the lens mounting frame is fixed to the top of the heat dissipation body through the second positioning component and located above the light source substrate, so that the optical center of each optical lens coincides with the optical axis of the corresponding lamp bead, and the overall lighting effect and light distribution consistency are improved. The installation positions of the light source substrate and the optical lens are restrained through the first positioning component and the second positioning component respectively, the heat dissipation capacity is improved, and meanwhile the assembly precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of street lamp, especially a LED street lamp module. BACKGROUND

[0002] In recent years, with the rapid development of LED lighting technology, the market puts forward higher requirements on the performance, life and cost of LED products. Especially in the field of road lighting, LED street lamps need to have the characteristics of high-efficiency heat dissipation, long life, high reliability and precise light distribution. At present, the mainstream LED street lamp module generally uses an aluminum substrate as a heat dissipation base material, adopts an integrated modular design, that is, multiple LED chips are integrated on an aluminum substrate, and are fixed on a heat sink through screws. However, this traditional design has the following technical defects:

[0003] Firstly, in terms of heat management, the heat conduction performance of the aluminum substrate is limited, resulting in a serious temperature gradient problem. Especially the LED chips in the central region of the aluminum substrate have a serious heat accumulation problem due to a long heat dissipation path, so the junction temperature is significantly higher than that in the edge region. This uneven heat distribution directly leads to a difference in light decay rate, and the service life of the LED in the central region is shortened by more than 30% compared with that in the edge region, which seriously affects the service life of the LED lamp. In addition, multiple LED chips share the same heat conduction path of the aluminum substrate, and the heat sources conduct heat to each other through the substrate, forming an unavoidable thermal coupling effect, which further aggravates the local overheating problem.

[0004] Secondly, in terms of assembly precision, the existing technology mainly relies on a screw positioning system. The aluminum substrate and the heat sink, and the lens and the heat sink are fixed by multiple screws. Due to the machining tolerance (±0.2mm) and assembly error, there is a positional deviation between the modules, which leads to a significant difference in light spot distribution of different modules in the same street lamp, and part of the light is misdirected to the non-target area, causing light pollution and seriously affecting the uniformity of illumination. The deviation of the lens and the LED chip leads to a loss of optical efficiency.

[0005] Thirdly, in terms of manufacturing process, each module usually needs 4-6 screws for fixation, and the assembly takes a long time. In addition, the insulation performance of the aluminum substrate itself is limited, and an additional insulation layer is often needed, which further increases the material cost and process complexity. UTILITY MODEL CONTENTS

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a LED street lamp module for solving the technical problems of uneven heat dissipation, high junction temperature in the central region and low assembly precision of the LED street lamp in the prior art.

[0007] To achieve the above-mentioned purpose, the utility model provides a LED street lamp module, comprising:

[0008] The light source structure comprises a plurality of light source substrates, each of which is provided with a plurality of lamp beads;

[0009] The heat dissipation structure comprises a heat dissipation main body and a plurality of heat dissipation areas provided on the top of the heat dissipation main body, a heat isolation area is provided between adjacent heat dissipation areas, and the edges of the heat dissipation areas are provided with a plurality of first positioning components, and the top of the heat dissipation main body is provided with second positioning components; each of the light source substrates is arranged on the corresponding heat dissipation area through the first positioning components;

[0010] The lens structure comprises a lens mounting frame and a plurality of optical lenses arranged on the lens mounting frame, the lens mounting frame is fixed on the top of the heat dissipation main body through the second positioning components and is located above the light source substrate, so that the optical center of each optical lens coincides with the optical axis of the corresponding lamp bead.

[0011] As a preferred mode, the heat dissipation structure further comprises a plurality of heat dissipation fins, each of which is arranged at the bottom of the corresponding heat dissipation area.

[0012] As a preferred mode, the top of the heat dissipation main body is further provided with an annular groove, the bottom of the lens mounting frame is provided with an annular protrusion corresponding to the annular groove; the side edge of the lens mounting frame is provided with a plurality of buckle grooves of different sizes, and the side edge of the heat dissipation main body is provided with buckles corresponding to the buckle grooves; the annular protrusion is clamped in the annular groove, and the buckles are embedded in the corresponding buckle grooves, so as to position and install the lens mounting frame on the top of the heat dissipation main body.

[0013] As a preferred mode, a waterproof sealing ring is further included, which is arranged in the annular groove.

[0014] As a preferred mode, the first positioning component comprises a first positioning pin arranged at the edge of the heat dissipation area.

[0015] As a preferred mode, the second positioning component comprises a second positioning pin arranged around the top of the heat dissipation main body.

[0016] As a preferred mode, the bottom of the heat dissipation main body is provided with a connecting cable.

[0017] As a preferred mode, the connecting cable is fixed on the bottom of the heat dissipation main body through a mounting pressing plate.

[0018] As a preferred mode, a waterproof ring is further included, which is arranged between the mounting pressing plate and the bottom of the heat dissipation main body.

[0019] As a preferred mode, the light source substrate includes a ceramic substrate.

[0020] As described above, the LED street lamp module has the following beneficial effects: each light source substrate is arranged on a corresponding heat dissipation area through the first positioning component, a heat isolation area is arranged between adjacent heat dissipation areas, each heat dissipation area corresponds to one light source substrate, so that each light source substrate is independently heat dissipated through the corresponding heat dissipation area and physically separated through the heat isolation area, thereby avoiding heat concentrated conduction, reducing the concentrated heating of the center area lamp beads, reducing the thermal interference between each other, increasing the heat diffusion path, and prolonging the service life of the LED street lamp module. The first positioning component restricts the installation position of the light source substrate, aligns the light source substrate with the heat dissipation area, eliminates the installation cumulative error, and avoids the problem of uneven heat dissipation caused by the installation offset of the light source substrate. The lens mounting frame is fixed on the top of the heat dissipation main body through the second positioning component and located above the light source substrate, so that the optical center of each optical lens coincides with the optical axis of the corresponding lamp bead, avoids the light spot offset or uneven brightness, improves the overall light efficiency and light distribution consistency, simplifies the assembly process, reduces the labor debugging cost, and is suitable for mass production.

[0021] Further, heat dissipation through multiple light source substrates will increase the error of substrate installation, therefore, the first positioning component and the second positioning component are used to restrict the installation position of the light source substrate and the optical lens respectively, thereby improving the heat dissipation capacity and the assembly precision. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 An exploded view of the LED street lamp module is shown.

[0023] Figure 2 A structural schematic view of the LED street lamp module is shown.

[0024] Figure 3 An installation structural schematic view of the LED street lamp module is shown.

[0025] Figure 4 Another installation structural schematic view of the LED street lamp module is shown.

[0026] ELEMENT NUMBER EXPLANATION

[0027] 1 light source structure

[0028] 11 light source substrate

[0029] 111 light bead

[0030] 2 heat dissipation structure

[0031] 21 heat dissipation main body

[0032] 211 second positioning component

[0033] 212 annular groove

[0034] 213 connecting cable

[0035] 214 buckle

[0036] 22 heat dissipation area

[0037] 221 heat isolation area

[0038] 222 first positioning component

[0039] 23 heat dissipation fin

[0040] 3 lens structure

[0041] 31 lens mounting frame

[0042] 311 buckle slot

[0043] 32 optical lens

[0044] 4 waterproof sealing ring

[0045] 5 mounting pressing plate

[0046] 6 waterproof ring

[0047] 7 mounting screw DETAILED DESCRIPTION

[0048] The implementation of the present application will be described by specific embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art according to the content disclosed in the present specification.

[0049] It is to be understood that the structures, proportions, sizes, etc. shown in the drawings accompanying the present specification are merely intended to assist understanding of the content disclosed in the specification, to be understood and read by those skilled in the art, and are not intended to limit the conditions under which the present application can be implemented, and therefore do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effects and purposes that the present application can produce, should still fall within the scope of the technical content disclosed by the present application. The following detailed description should not be considered limiting, and the scope of the embodiments of the present application is limited only by the claims of the published patent. The terms used herein are only intended to describe the specific embodiments, and are not intended to limit the present application. Spatially related terms, such as "upper", "lower", "left", "right", "below", "under", "bottom", "above", "top", etc., can be used in the specification to facilitate the description of the relationship between one element or feature shown in the drawings and another element or feature.

[0050] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing", "holding" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] Furthermore, as used in this document, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the terms "comprise", "comprising", "include", "including" and / or "contain", "containing" indicate the presence of the stated features, operations, elements, components, items, categories, and / or groups, but do not exclude the presence or addition of one or more other features, operations, elements, components, items, categories, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions or operations is inherently mutually exclusive in some way, will this definition be an exception.

[0052] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the embodiments of the present application is further described in detail in the following embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only intended to explain the present application, and are not intended to limit the application.

[0053] As Figures 1-4The utility model provides a LED street lamp module, including:

[0054] The light source structure 1 includes a plurality of light source substrates 11, and each light source substrate 11 is provided with a plurality of lamp beads 111.

[0055] The heat dissipation structure 2 includes a heat dissipation main body 21 and a plurality of heat dissipation areas 22 arranged on the top of the heat dissipation main body 21, a heat isolation area 221 is arranged between adjacent heat dissipation areas 22, the edges of the heat dissipation areas 22 are provided with a plurality of first positioning components 222, and the top of the heat dissipation main body 21 is provided with second positioning components 211.

[0056] The lens structure 3 includes a lens mounting rack 31 and a plurality of optical lenses 32 arranged on the lens mounting rack 31, the lens mounting rack 31 is fixed on the top of the heat dissipation main body 21 through the second positioning components 211 and is located above the light source substrates 11, so that the optical centers of the optical lenses 32 coincide with the optical axes of the corresponding lamp beads 111.

[0057] The LED street lamp module of the utility model, each light source substrate 11 is arranged on the corresponding heat dissipation area 22 through the first positioning component 222, a heat isolation area 221 is arranged between adjacent heat dissipation areas 22, each heat dissipation area 22 corresponds to a light source substrate 11, so that each light source substrate 11 is independently cooled through the corresponding heat dissipation area 22 and is physically separated through the heat isolation area 221, heat concentration conduction is avoided, the concentrated heating of the center area lamp bead 111 is reduced, the mutual thermal interference is reduced, the heat diffusion path is increased, and the service life of the LED street lamp module is prolonged. The first positioning component 222 restricts the mounting position of the light source substrate 11, aligns the light source substrate 11 with the heat dissipation area 22, eliminates the mounting cumulative error, and avoids the problem of uneven heat dissipation caused by the mounting offset of the light source substrate 11. The lens mounting rack 31 is fixed on the top of the heat dissipation main body 21 through the second positioning components 211 and is located above the light source substrates 11, so that the optical centers of the optical lenses 32 coincide with the optical axes of the corresponding lamp beads 111, the light spot offset or uneven brightness is avoided, the overall light efficiency and the light distribution consistency are improved, the assembly process is simplified, the manual debugging cost is reduced, and the utility model is suitable for mass production.

[0058] Further, the heat dissipation through the plurality of light source substrates 11 increases the error of the substrate installation, and therefore the first positioning component 222 and the second positioning component 211 are used to constrain the installation positions of the light source substrate 11 and the optical lens 32, thereby improving the heat dissipation capacity and the assembly precision.

[0059] In the embodiment, as shown in Figure 1 , 3 , the lamp bead 111 comprises an LED light-emitting lamp bead. The LED light-emitting lamp bead has the advantages of small volume, low energy consumption, high energy conversion efficiency and the like.

[0060] In the embodiment, as shown in Figure 1 , 3 , the plurality of first positioning components 222 are arranged at the edges of the heat dissipation areas 22 and are alternately arranged on the two sides of the heat dissipation body 21 as the reference surface. For example, the first positioning component 222 arranged at the edge of one heat dissipation area 22 is located on one side of the heat dissipation body 21, and the first positioning component 222 arranged at the edge of another heat dissipation area 22 adjacent to the first positioning component 222 is located on the other side of the heat dissipation body 21, so as to constrain the installation position of the light source substrate 11 and eliminate the cumulative installation error.

[0061] In the embodiment, as shown in Figure 1 , 2 , the heat dissipation structure 2 further comprises a plurality of heat dissipation fins 23, and each heat dissipation fin 23 is arranged at the bottom of the corresponding heat dissipation area 22. Each light source substrate 11 is independently heat-dissipated through the heat dissipation fin 23 at the bottom of the corresponding heat dissipation area 22, so as to reduce the thermal interference between each other and reduce the concentrated heat of the lamp bead 111 in the central area through physical isolation, and meanwhile increase the heat diffusion path.

[0062] In the embodiment, as shown in Figure 1As shown, the top of the heat dissipation body 21 is also provided with an annular groove 212, and the bottom of the lens mounting rack 31 is provided with an annular protrusion corresponding to the annular groove 212; the side of the lens mounting rack 31 is provided with a plurality of buckle grooves 311 of different sizes, and the side of the heat dissipation body 21 is provided with buckles 214 corresponding to the buckle grooves 311; the annular protrusion is clamped in the annular groove 212, and the buckle 214 is embedded in the corresponding buckle groove 311 to position and install the lens mounting rack 31 on the top of the heat dissipation body 21. The buckle groove 311 includes an inclined guide surface and a vertical stop surface, and each buckle groove 311 is asymmetrically arranged, that is, the inclined guide surfaces alternately change direction. The buckle 214 includes an inclined guide surface matching the inclined guide surface and a locking surface matching the vertical stop surface. Different buckles 214 and buckle grooves 311 establish a unique matching relationship. When correctly installed, the inclined guide surface of the buckle 214 slides along the inclined guide surface of the buckle groove 311, and the locking surface of the buckle 214 finally fits with the vertical stop surface of the buckle groove 311.

[0063] In this embodiment, when installing the lens structure 3, the annular protrusion at the bottom of the lens mounting rack 31 is first embedded in the annular groove 212 at the top of the heat dissipation body 21 to achieve preliminary coarse positioning and automatically limit the displacement of the lens structure 3 in the horizontal plane (XY direction). Then, the inclined guide surface of the buckle 214 slides along the inclined guide surface of the buckle groove 311, the locking surface of the buckle 214 finally fits with the vertical stop surface of the buckle groove 311, and the buckle 214 is embedded in the corresponding buckle groove 311, so that through the matching of the buckle 214 and the buckle groove 311, it is ensured that the lens mounting rack 31 can only be correctly aligned in one direction. If reverse installation is attempted, the buckle 214 and the buckle groove 311 will be physically blocked due to structural interference. In this way, the cooperation of the annular groove 212 and the annular protrusion achieves preliminary coarse positioning of the lens structure 3 to limit the displacement of the lens structure 3 in the horizontal plane (XY direction), and the buckle 214 and the buckle groove 311 ensure that the lens mounting rack 31 can only be correctly aligned in one direction to achieve fine positioning and avoid reverse assembly errors. Finally, the lens mounting rack 31 is fixed on the top of the heat dissipation body 21 through the second positioning component 211, which simplifies the assembly process, avoids the displacement caused by relying only on screw positioning, reduces assembly errors, improves the optical axis alignment accuracy, ensures that the optical axis of each lamp bead 111 coincides with the optical center of the optical lens 32, thereby reducing optical efficiency loss and improving overall light efficiency and light distribution consistency.

[0064] In this embodiment, as shown, Figure 1 It also includes a waterproof sealing ring 4, which is arranged in the annular groove 212. The waterproof sealing ring 4 fills the assembly gap between the lens mounting rack 31 and the heat dissipation body 21 to prevent rainwater, dust, corrosive gases, etc. from entering the interior.

[0065] In the embodiment, as shown in Figure 1 , 3 The first positioning component 222 includes a first positioning pin arranged at the edge of the heat dissipation area 22. When installing the light source substrate 11, the installation position of the light source substrate 11 is first constrained by the first positioning pin to realize the alignment and positioning of the light source substrate 11 and the heat dissipation area 22, and then the light source substrate 11 is fixed on the corresponding heat dissipation area 22 by the mounting screw 7. In this way, the mechanical positioning replaces the manual calibration, reduces the installation error, and simplifies the assembly process through the first positioning pin and the mounting screw 7.

[0066] In the embodiment, as shown in Figure 1 , 3 , 4, the second positioning component 211 includes a second positioning pin arranged around the top of the heat dissipation body 21. The positioning and installation of the lens mounting frame 31 and the heat dissipation body 21 are realized through the annular groove 212 at the top of the heat dissipation body 21, the annular protrusion at the bottom of the lens mounting frame 31, the buckle slot 311 at the side of the lens mounting frame 31, the buckle 214 at the side of the heat dissipation body 21, and the second positioning pin, which simplifies the assembly process and reduces the manual debugging cost by replacing the manual calibration with mechanical positioning, avoids the deviation caused by relying only on screw positioning, and reduces the assembly error. Further, the accurate positioning and installation of the lens mounting frame 31 can improve the optical axis alignment accuracy and ensure that the optical axis of each lamp bead 111 coincides with the optical center of the optical lens 32, thereby reducing the light loss and improving the light output efficiency.

[0067] In the embodiment, as shown in Figures 1-4 , the bottom of the heat dissipation body 21 is provided with a connection cable 213. The connection cable 213 is used to transmit external power to the light source structure 1 to provide a stable working voltage, or is used to transmit data. The connection cable 213 is fixed at the bottom of the heat dissipation body 21 by the mounting pressing plate 5.

[0068] In the embodiment, as shown in Figure 2 , a waterproof ring 6 is further included, which is arranged between the mounting pressing plate 5 and the bottom of the heat dissipation body 21 to fill the assembly gap between the mounting pressing plate 5 and the heat dissipation body 21 and prevent rainwater, dust, moisture, etc. from penetrating into the internal circuit or the heat dissipation body 21.

[0069] In the embodiment, as shown in Figure 1 , 3As shown, the light source substrate 11 comprises a ceramic substrate. The ceramic substrate has good heat conduction performance, insulation performance and high temperature resistance characteristics, providing a stable low temperature working environment for the light source structure 1, effectively reducing the junction temperature of the lamp beads 111, thereby significantly prolonging the service life of the LED street lamp module. In addition, the ceramic substrate also has the characteristics of low thermal expansion coefficient, which can effectively reduce the damage of thermal stress to the lamp beads 111, and further improve its reliability.

[0070] In summary, the LED street lamp module of the present application has the following advantages:

[0071] (1) Realize zoning heat dissipation: each heat dissipation area 22 corresponds to a light source substrate 11, and a heat isolation area 221 is arranged between adjacent heat dissipation areas 22, so that each light source substrate 11 is independently cooled through the corresponding heat dissipation area 22, and is physically separated by the heat isolation area 221, avoiding concentrated heat conduction, reducing the concentrated heating of the center area lamp beads 111, reducing the mutual thermal interference, increasing the heat diffusion path, and prolonging the service life of the LED street lamp module.

[0072] (2) Improve positioning accuracy and reduce assembly deviation: the first positioning component 222 restricts the installation position of the light source substrate 11, and the light source substrate 11 and the heat dissipation area 22 are aligned through the first positioning component 222, and then fixed to each other through the mounting screw 7, eliminating the installation cumulative error and avoiding the problem of uneven heat dissipation caused by the installation offset of the light source substrate 11. Through the annular groove 212 at the top of the heat dissipation body 21 and the annular protrusion at the bottom of the lens mounting frame 31, the buckle slot 311 at the side of the lens mounting frame 31 and the buckle 214 at the side of the heat dissipation body 21, and the second positioning component 211, the positioning and installation of the lens mounting frame 31 and the heat dissipation body 21 are realized, avoiding the offset caused by relying on screw positioning only, reducing assembly error, ensuring that the optical axis of each lamp bead 111 coincides with the optical center of the optical lens 32, avoiding light spot offset or uneven brightness, and improving overall light efficiency and light distribution consistency.

[0073] (3) Simplify the assembly process: through the first positioning component 222 and the second positioning component 211, mechanical positioning is realized instead of manual calibration, installation error is reduced, assembly process is simplified, and manual debugging cost is reduced, which is suitable for mass production

[0074] In summary, the present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0075] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. An LED street light module, characterized by The application relates to a light source structure (1), a heat dissipation structure (2) and a lens structure (3). The light source structure (1) comprises a plurality of light source substrates (11), each of which is provided with a plurality of lamp beads (111). The heat dissipation structure (2) comprises a heat dissipation main body (21) and a plurality of heat dissipation areas (22) arranged on the top of the heat dissipation main body (21), a heat isolation area (221) is arranged between adjacent heat dissipation areas (22), the edges of the heat dissipation areas (22) are provided with a plurality of first positioning components (222), and the top of the heat dissipation main body (21) is provided with a second positioning component (211); each light source substrate (11) is arranged on the corresponding heat dissipation area (22) through the first positioning component (222). The lens structure (3) comprises a lens mounting rack (31) and a plurality of optical lenses (32) arranged on the lens mounting rack (31), the lens mounting rack (31) is fixed on the top of the heat dissipation main body (21) through the second positioning component (211) and is located above the light source substrate (11), so that the optical center of each optical lens (32) coincides with the optical axis of the corresponding lamp bead (111).

2. The LED street light module of claim 1, wherein, The heat dissipation structure (2) further comprises a plurality of heat dissipation fins (23), each of which is arranged at the bottom of the corresponding heat dissipation area (22).

3. The LED street light module of claim 1, wherein, The top of the heat dissipation main body (21) is further provided with an annular groove (212), the bottom of the lens mounting rack (31) is provided with an annular protrusion corresponding to the annular groove (212); the side of the lens mounting rack (31) is provided with a plurality of buckle grooves (311) of different sizes, the side of the heat dissipation main body (21) is provided with a buckle (214) corresponding to the buckle grooves (311); the annular protrusion is clamped in the annular groove (212), and the buckle (214) is embedded in the corresponding buckle groove (311), so that the lens mounting rack (31) is positioned and installed on the top of the heat dissipation main body (21).

4. The LED street light module of claim 3, wherein, A waterproof sealing ring (4) is further arranged in the annular groove (212).

5. The LED street light module of claim 1, wherein, The first positioning component (222) comprises a first positioning pin arranged at the edge of the heat dissipation area (22).

6. The LED street light module of claim 1, wherein, The second positioning component (211) comprises a second positioning pin arranged around the top of the heat dissipation main body (21).

7. The LED street light module of claim 1, wherein, The bottom of the heat dissipation main body (21) is provided with a connecting cable (213).

8. The LED street light module of claim 7, wherein, The connecting cable (213) is fixed on the bottom of the heat dissipation main body (21) through a mounting pressing plate (5).

9. The LED street light module of claim 8, wherein, A waterproof ring (6) is further arranged between the mounting pressing plate (5) and the bottom of the heat dissipation main body (21).

10. The LED street light module of claim 1, wherein, The light source substrate (11) comprises a ceramic substrate.

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