Light source

Abstract

A light source (1), comprising: an excitation light source (10) and a wavelength conversion apparatus (20). The excitation light source (10) comprises a housing (110), a laser chip (120), and a light beam guiding element (130). The housing (110) forms a packaging cavity (140). The packaging cavity (140) is provided with a light outlet (150). The laser chip (120) and the light beam guiding element (130) are provided in the packaging cavity (140). The laser chip (120) is used for emitting a laser beam. The light beam guiding element (130) is used for guiding the laser beam towards the light outlet (150). The wavelength conversion apparatus (20) is spaced apart from the housing (110) and corresponds to the light outlet (150). The wavelength conversion apparatus (20) and the excitation light source (10) are separately arranged, and the housing (110) of the excitation light source (10) and the wavelength conversion apparatus (20) are spaced apart, so that the wavelength conversion apparatus (20) can be easily maintained and replaced, so as to avoid waste by discarding the entire light source (1).

Description

light source Technical Field

[0001] The present application relates to the technical field of projection equipment, and in particular to a light source. Background Art

[0002] The light source uses laser to excite phosphor to produce fluorescence which mixes with laser to produce white light, which is conducive to the miniaturization and integration of laser lighting and is suitable for flashlights, laser car lights and other fields.

[0003] At present, light sources usually place the laser chip and wavelength conversion device in the same enclosed space to achieve fluorescence excitation and laser fluorescence synthesis. However, during the fluorescence excitation process, the wavelength conversion device generates a large amount of heat. After working for a long time, the wavelength conversion device is at risk of damage. Since the laser chip and the wavelength conversion device are set in the same enclosed space, it is difficult to repair and replace the wavelength conversion device alone. Usually, the entire light source is discarded directly, resulting in waste. Summary of the Invention

[0004] The embodiments of the present application provide a light source to at least partially improve the above-mentioned problems.

[0005] The implementation method of this application is achieved through the following technical solutions.

[0006] Embodiments of the present application provide a light source comprising: an excitation light source and a wavelength conversion device. The excitation light source comprises a housing, a laser chip, and a beam-directing element. The housing forms a housing cavity having a light outlet. The laser chip and the beam-directing element are disposed within the housing cavity. The laser chip is configured to emit a laser beam; the beam-directing element is configured to guide the laser beam toward the light outlet. The wavelength conversion device is spaced apart from the housing and disposed on the optical path of the laser beam exiting through the light outlet. The laser beam is obliquely incident on the wavelength conversion device.

[0007] In some embodiments, the beam directing element is a hemispherical lens.

[0008] In some embodiments, the light source further includes: a selectively transparent membrane, which is arranged between the wavelength conversion device and the shell, and the laser beam is incident on the selectively transparent membrane after being emitted from the light outlet, and is incident on the wavelength conversion device after being emitted from the selectively transparent membrane.

[0009] In some embodiments, the wavelength conversion device includes a substrate and a fluorescent layer. The selective transmission film is disposed on the substrate and located on the light-incident surface of the wavelength conversion device. The fluorescent layer is disposed on the substrate and located on the light-exiting surface of the wavelength conversion device.

[0010] In some embodiments, the shell includes a base, a side shell and a top cover, the side shell is arranged around the base, the top cover is connected to the end of the side shell away from the base, the base, the side shell and the top cover together form the packaging cavity, the light outlet is opened on the top cover, and the excitation light source and the light beam guiding element are arranged on the base.

[0011] In some embodiments, the top cover is provided with an anti-reflection film, and the anti-reflection film is located on a light-emitting side surface of the top cover.

[0012] In some embodiments, the light source further includes a Zener diode, which is disposed in the packaging cavity and connected in series with the laser chip.

[0013] In some embodiments, there are multiple laser chips and multiple beam guiding elements, and the multiple beam guiding elements are arranged in a one-to-one correspondence with the multiple laser chips. The laser light emitted by each laser chip is guided by one beam guiding element and converged on the wavelength conversion device.

[0014] In some embodiments, the light source further includes a diffuser, which is disposed between the wavelength conversion device and the housing and located on a light-emitting path of the laser light.

[0015] In some embodiments, the light source further includes: a collecting lens, which is disposed on the optical path of the laser beam emitted through the wavelength conversion device.

[0016] The light source provided in the embodiment of the present application is configured such that the wavelength conversion device is separately arranged from the excitation light source, the housing of the excitation light source is spaced apart from the wavelength conversion device, and the laser beam emitted from the excitation light source is obliquely incident on the wavelength conversion device. This can reduce the heat concentration of the entire wavelength conversion device, and facilitate maintenance personnel to repair and replace the damaged wavelength conversion device after the light source has been working for a long time, thereby avoiding the waste of directly discarding the entire light source after the wavelength conversion device is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] FIG1 shows a cross-sectional view of a light source provided by an embodiment of the present application;

[0019] FIG2 shows a cross-sectional view of another light source provided by an embodiment of the present application;

[0020] FIG3 shows a schematic structural diagram of another light source provided by an embodiment of the present application;

[0021] FIG4 shows a cross-sectional view of another light source provided by an embodiment of the present application.

[0022] Figure numerals: light source 1, excitation light source 10, shell 110, base 111, side shell 112, top cover 113, laser chip 120, beam guiding element 130, packaging cavity 140, light outlet 150, wavelength conversion device 20, substrate 210, fluorescent layer 220, collecting lens 30, anti-reflection film 40, Zener tube 50, diffuser 60, heat sink 70, selective transmission membrane 80. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application.

[0025] The light source uses laser to excite phosphor to produce fluorescence which mixes with laser to produce white light, which is conducive to the miniaturization and integration of laser lighting and is suitable for flashlights, laser car lights and other fields.

[0026] At present, light sources usually place the laser chip and wavelength conversion device in the same enclosed space to achieve fluorescence excitation and laser fluorescence synthesis. However, during the fluorescence excitation process, the wavelength conversion device generates a large amount of heat. After working for a long time, the wavelength conversion device is at risk of damage. Since the laser chip and the wavelength conversion device are set in the same enclosed space, it is difficult to repair and replace the wavelength conversion device alone. Usually, the entire light source is discarded directly, resulting in waste.

[0027] Based on the above technical problems, the present application proposes a light source 1. Please refer to Figure 1. Figure 1 shows a cross-sectional view of a light source 1 provided by an embodiment of the present application. The light source 1 may include: an excitation light source 10, a wavelength conversion device 20 and a collecting lens 30.

[0028] The excitation light source 10 may include a shell 110, a laser chip 120 and a beam directing element 130. The shell 110 forms a packaging cavity 140. The packaging cavity 140 has a light outlet 150. The laser chip 120 and the beam directing element 130 are arranged in the packaging cavity 140. The laser chip 120 is used to emit a laser beam, and the beam directing element 130 is used to guide the laser beam toward the light outlet 150.

[0029] Please continue to refer to Figure 1. In one embodiment, the shell 110 may include: a base 111, a side shell 112 and a top cover 113. The side shell 112 is arranged around the base 111, and the top cover 113 is connected to the end of the side shell 112 away from the base 111. The base 111, the side shell 112 and the top cover 113 together form a packaging cavity 140. The light outlet 150 is opened on the top cover 113, and the excitation light source 10 and the beam guiding element 130 are arranged on the base 111.

[0030] In this embodiment, the base 111 can be a rectangular plate, and four side shells 112 can be provided. The four side shells 112 are respectively connected to the four sides of the base 111. In a more specific embodiment, the shape and size of the side shells 112 can be set to a consistent structure to facilitate mold production. Furthermore, the base 111 can be integrally formed with the side shells 112, which can simplify the installation of the shell 110.

[0031] The base 111 and the side shell 112 can be made of plastic material, which has low cost and good insulation, or can be made of metal material, which has good chemical corrosion resistance and high strength. The specific selection can be made according to actual conditions and is not limited here.

[0032] The top cover 113 can also be a rectangular plate structure, and the top cover 113 can be covered on the side shell 112. In some embodiments, the size of the top cover 113 can be slightly larger than the size of the base 111, so as to ensure that the top cover 113 can completely close the side shell 112, avoiding the external environment from affecting the components inside the packaging cavity 140, such as the laser chip 120, the beam guiding element 130, etc., thereby ensuring the normal operation of the components inside the packaging cavity 140.

[0033] In one embodiment, the light outlet 150 can be the entire top cover 113, and the top cover 113 can be a light-transmitting window. Specifically, in some embodiments, the entire top cover 113 can be a light-transmitting area. In other embodiments, only a partial area of ​​the top cover 113 can be set as a light-transmitting window, which is not limited here.

[0034] The embodiment of the present application does not limit the connection method between the top cover 113 and the side shell 112. For example, the connection between the top cover 113 and the side cover 112 can be melt-bonded to meet the airtightness requirement in the packaging cavity 140.

[0035] Further, referring to FIG. 1 , in one embodiment, the top cover 113 may also be provided with an antireflection film 40, which may be located on the light-emitting surface of the top cover 113. In this embodiment, the antireflection film 40 increases the transmittance of blue light, thereby improving the excitation efficiency of the blue laser on the wavelength conversion device 20 and thereby increasing the brightness of the white light.

[0036] It is understandable that in other embodiments, the anti-reflection film 40 can also be set on the top cover 113 and cover the light outlet 150. Similarly, this can also improve the excitation efficiency of the blue laser on the wavelength conversion device 20, thereby helping to improve the brightness of the white light.

[0037] It should be noted that the embodiment of the present application does not limit the setting method of the laser chip 120. Please continue to refer to Figure 1. In some embodiments, the light source 1 may also include a heat sink 70. The heat sink 70 can be set on the base 111, and the laser chip 120 can be set on the heat sink 70, for example, it can be attached to the heat sink 70.

[0038] The heat sink 70 can be made of aluminum nitride ceramic material, which has good thermal conductivity. The heat sink 70 is set between the laser chip 120 and the base 111, which can be used to efficiently conduct the heat generated by the laser chip 70 to the shell 110 to improve the heat dissipation efficiency.

[0039] In addition, in some embodiments, the surface of the heat sink 70 can be a slope, which can also change the position and direction of the laser light emitted by the laser light source 120. The embodiment of the present application does not limit the height and shape of the heat sink 70, and can be set according to actual conditions.

[0040] Meanwhile, the embodiment of the present application does not limit the color of the laser beam emitted by the laser chip 120 , and the following description will be made using the laser chip 120 emitting blue laser as an example.

[0041] Referring to FIG. 2 , in one embodiment, a beam-directing element 130 is disposed in the optical path of the laser beam emitted by the laser chip 120 to change the direction of the laser beam. For example, if the laser chip 120 emits a laser beam horizontally and relatively parallel to the upper surface of the base 111, the beam-directing element 130 changes the direction of the laser beam to an upward direction, so that the laser beam is emitted upward through the light outlet 115 of the top cover 113. This utilizes both the horizontal and vertical space of the packaging cavity 114, thereby reducing the overall volume.

[0042] The embodiment of the present application does not limit the specific structure of the beam directing element 130. For example, the beam directing element 130 can be configured as an optical element or a combination of optical elements that can change the direction of the light beam, such as a reflector, a prism, or a light guide.

[0043] In the examples shown in Figures 2 to 4 , the light-directing element 130 can be configured as a hemispherical lens. Specifically, the hemispherical lens can be configured such that: the flat surface of the hemispherical lens serves as a reflective surface and is tilted relative to the upper surface of the base 111. A portion of the hemispherical surface of the hemispherical lens faces the laser chip 120 to receive the laser beam from the laser chip 120, while the other portion of the hemispherical surface faces the light outlet 115 of the top cover 113. In this manner, the laser beam passes through the hemispherical surface of the hemispherical lens and enters the interior of the hemispherical lens, where it is refracted. It then reflects off the flat surface of the hemispherical lens, changing its direction of travel. Finally, it passes through the other portion of the hemispherical lens and exits toward the light outlet 115 of the top cover 113, where it is refracted again. Since the laser beam undergoes two refractions on the hemispherical surface of the hemispherical lens, the hemispherical lens acts like a spherical lens on the laser beam, converting the originally diverging laser beam into a converging laser beam. The convergence point of the laser beam can be located on the wavelength conversion device 20 to increase the central brightness of the emitted light.

[0044] Please refer to Figures 3 and 4 at the same time. Furthermore, in some embodiments, multiple laser chips 120 can be provided, and multiple beam guiding elements 130 can also be provided. The multiple beam guiding elements 130 are arranged in a one-to-one correspondence with the multiple laser chips 120. The laser light emitted by the multiple laser chips 120 is obliquely incident on the same area of ​​the wavelength conversion device 20. In this way, multiple light spots that at least partially overlap can be formed in the same area of ​​the wavelength conversion device 20, thereby significantly improving the brightness of the light source 1.

[0045] For example, as shown in FIG4 , the number of laser chips 120 can be four, each laser chip 120 can be respectively arranged at a corner of the packaging cavity 140 , and each laser chip 120 can be arranged in series. The four beam guiding elements 130 can be fixed together by a fixing frame, and the angle of each beam guiding element can be made consistent. The laser light emitted by each laser chip 120 is guided by a beam guiding element 130 and converged on the wavelength conversion device 20 , which is beneficial to improving the brightness of the light source 1 .

[0046] The wavelength conversion device 20 is spaced apart from the housing 110 and corresponds to the light outlet 150 . The laser beam emitted by the excitation light source 10 can pass through the beam guiding element 130 and then be emitted from the light outlet 150 and enter the wavelength conversion device 20 .

[0047] The embodiments of the present application do not limit the specific structure of the wavelength conversion device 20. The wavelength conversion device 20 can be a fluorescent plate, a grating wavelength meter, a spectrometer, a color wheel, etc. There is no limitation here. It can be specifically configured according to actual conditions. Please continue to refer to Figures 1 and 2. For example, in this embodiment, the wavelength conversion device 20 may include: a substrate 210 and a fluorescent layer 220.

[0048] Specifically, the fluorescent layer 220 can be disposed on the substrate 210. After the laser beam is irradiated on the fluorescent layer 220, it can be excited into a fluorescent beam. The embodiments of the present application do not limit the configuration of the fluorescent layer 220. For example, the fluorescent layer 220 can be directly sintered on the substrate 210. In some embodiments, the fluorescent layer 220 can be made of a rare earth-doped inorganic material, such as ytterbium and erbium co-doped yttrium fluoride, sodium yttrium fluoride, lanthanum fluoride, etc. The specific configuration can be based on actual conditions and is not limited here.

[0049] Specifically, the fluorescent layer 220 can be disposed on a surface of the substrate 210 away from the housing 110. In one embodiment, the fluorescent layer 220 can be provided with yellow phosphor. When blue laser light is incident on the wavelength conversion device 20, the blue laser light excites the yellow phosphor in the fluorescent layer 220, generating yellow converted light (fluorescence). This yellow converted light mixes with the incompletely converted blue laser light to form white light.

[0050] In some other embodiments, the wavelength conversion device may further include a functional layer, which may be disposed on the surface of the fluorescent layer 220. The functional layer may be an electron transport layer, a hole transport layer, a protective layer, etc. The electron transport layer is typically made of materials with high conductivity and thermal stability, such as oxides, nitrides, etc. The function of the electron transport layer is to transfer excited electrons to the light-emitting layer, thereby generating fluorescence. The hole transport layer is typically made of materials with high thermal and chemical stability, such as nitrides, silicides, etc. The function of the hole transport layer is to transfer holes in the light-emitting layer to the light-emitting layer, thereby achieving luminescence. The protective layer is typically made of materials with high thermal and chemical stability, such as silicides, nitrides, etc. The function of the protective layer is to protect the phosphor from environmental factors and extend the service life of the phosphor. It should be noted that the embodiments of the present application do not limit the specific structure and composition of the wavelength conversion device 20, and users can select a suitable wavelength conversion device 20 according to actual needs.

[0051] The collecting lens 30 can be arranged on the side of the wavelength conversion device 20 away from the excitation shell 110. The collecting lens 30 can be used to converge the white laser emitted from the wavelength conversion device 20. The embodiment of the present application does not limit the specific focal length and size of the collecting lens 30, and the specific selection can be made according to actual conditions.

[0052] The light source 1 provided in the embodiment of the present application is configured such that the wavelength conversion device 20 is separately arranged from the excitation light source 10, and the shell 110 of the excitation light source 10 is spaced apart from the wavelength conversion device 20, and the laser beam emitted by the excitation light source 10 is obliquely incident on the wavelength conversion device 20. This can reduce the heat concentration of the entire wavelength conversion device 20, and is convenient for maintenance personnel to repair and replace the damaged wavelength conversion device 20 after the light source 1 has been working for a long time, thereby avoiding the waste of directly discarding the entire light source 1 after the wavelength conversion device 20 is damaged.

[0053] Further, please continue to refer to Figure 1. In one embodiment, the light source 1 may also include: a selectively transparent membrane 80. The selectively transparent membrane 80 can be arranged between the wavelength conversion device 20 and the shell 110. The laser beam is emitted through the light outlet 115 of the top cover 113 and then enters the selectively transparent membrane 80. After being emitted through the selectively transparent membrane 80, it is incident on the wavelength conversion device 20.

[0054] In this embodiment, the selectively transparent film 80 can be a film layer that transmits blue light and reflects yellow light. Since the converted light generated during the excitation of the laser beam in the wavelength conversion device 20 is light uniformly emitted 360 degrees, the selectively transparent film 80 allows the laser beam to be incident on the wavelength conversion device 20 and allows the converted light to be emitted from one side thereof.

[0055] In addition, please refer to Figure 1 again. In some embodiments, the light source 1 may further include a Zener tube 50. The Zener tube 50 may be disposed in the packaging cavity 140. Specifically, the Zener tube 50 may be disposed on the base 111 and arranged in series with the laser chip 120. The Zener tube 50 may play an anti-static role and may be used to protect the laser chip 120 and prevent the laser chip 120 from being damaged by static electricity.

[0056] Referring to Figure 3 , in some embodiments, the light source 1 may further include a diffuser 60. The diffuser 60 may be positioned between the wavelength conversion device 20 and the housing 110 and located along the laser light's exit path. For example, the diffuser 60 may be positioned directly on the top cover 112. The diffuser 60 evenly diffuses the blue laser light emitted by the laser chip 120 to better excite the phosphor layer 220 to produce white light. Furthermore, the diffuser 60 can adjust the angle of the laser beam to achieve different diffusion effects. The specific configuration can be tailored to the specific situation and is not a limitation here.

[0057] Furthermore, in one embodiment, the light source 1 may further include a bracket (not shown), and the collecting lens 30, the wavelength conversion device 20, and the diffuser 60 may be disposed on the bracket and integrated into a whole. This allows for more convenient control of the gap between the collecting lens 30, the wavelength conversion device 20, and the diffuser 60 as a whole and the housing 110. The bracket may be separate from the housing 110 and may be detachably connected to the housing 10, for example, by being fixed to the housing 10 with screws.

[0058] In addition, the collecting lens 30, the wavelength conversion device 20 and the diffuser 60 can also be set to be detachably connected to the bracket, which can further facilitate maintenance personnel to replace the collecting lens 30, the wavelength conversion device 20 and the diffuser 60.

[0059] The working principle of the light source 1 provided in the embodiment of the present application is as follows:

[0060] Please refer to Figure 2, which illustrates the light source 1 shown in Figure 2. When the laser chip 120 is powered on, the laser chip 120 emits a blue laser beam. After the blue laser is irradiated by the beam directing element 130, it is emitted toward the light outlet 150 of the packaging cavity 140. After passing through the light outlet 150, the blue laser is incident on the anti-reflection film 40, and then emitted from the anti-reflection film 40. After being diffused by the diffuser 60, it enters the selective transmission film 80. After passing through the selective transmission film 80, the blue laser is irradiated on the wavelength conversion device and reacts with the fluorescent layer to excite yellow fluorescence. The yellow fluorescence is combined with the unexcited blue laser to form white light. Finally, the white light is emitted toward the collecting lens 30 and is collected by the collecting lens 30.

[0061] In summary, the light source 1 provided in the embodiment of the present application is provided with a selectively transparent membrane 80, which has selective transmittance to the laser light emitted by the excitation light source 10 and reflectivity to the converted light. The laser light is partially converted into the converted light under the action of the wavelength conversion device 20. The converted light reflects the converted light emitted in the direction of the excitation light source 10 under the action of the selectively transparent membrane to improve the utilization rate of the converted light. However, due to the inclination angle between the laser light and the selectively transparent membrane 80, when this angle is too large, the selectively transparent membrane 80 will reflect the incident laser light, which will cause the utilization rate of the laser light to decrease. At this time, the wavelength conversion device 20 is set separately from the excitation light source 10, which can reduce the oblique incidence angle of the laser light emitted by the excitation light source 10, thereby improving the utilization rate of the laser light, and the shell 110 of the excitation light source 10 is set apart from the wavelength conversion device 20, while also reducing the volume of the excitation light source 10 and reducing the heat concentration of the entire wavelength conversion device 20. This is conducive to replacing different wavelength conversion devices 20 according to different application scenarios, and is convenient for maintenance personnel to repair and replace the damaged wavelength conversion device 20 after the light source 1 has been working for a long time, avoiding the waste of directly discarding the entire light source 1 after the wavelength conversion device 20 is damaged.

[0062] In this disclosure, unless otherwise specified or limited, terms such as "mounted" and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, integral connections, or transmission connections; they can be direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0063] In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as a specific reference or special structure. The description of the term "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present invention and the features of the different embodiments or examples, unless they are contradictory.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A light source, characterized in that: include: An excitation light source, the excitation light source comprising a housing, a laser chip and a beam guiding element, the housing forming a packaging cavity, the packaging cavity having a light outlet, the laser chip and the beam guiding element being arranged in the packaging cavity; the laser chip being used to emit a laser beam; the beam guiding element being used to guide the laser beam toward the light outlet; and A wavelength conversion device is arranged at a distance from the shell and is arranged on the optical path of the laser beam emitted through the light outlet, and the laser beam is incident obliquely on the wavelength conversion device.

2. The light source according to claim 1, characterized in that The light beam guiding element is a hemispherical lens.

3. The light source according to claim 1, characterized in that The light source further includes: a selectively transparent membrane, which is disposed between the wavelength conversion device and the shell. The laser beam is incident on the selectively transparent membrane after being emitted from the light outlet, and is incident on the wavelength conversion device after being emitted from the selectively transparent membrane.

4. The light source according to claim 3, characterized in that The wavelength conversion device comprises: A substrate, wherein the selective transmission film is disposed on the substrate and is located on a light incident side surface of the wavelength conversion device; and A fluorescent layer is disposed on the substrate and located on a light-emitting surface of the wavelength conversion device.

5. The light source according to claim 1, characterized in that The shell includes a base, a side shell and a top cover, the side shell is arranged around the base, the top cover is connected to an end of the side shell away from the base, the base, the side shell and the top cover together form the packaging cavity, the light outlet is opened on the top cover, and the excitation light source and the light beam guiding element are arranged on the base.

6. The light source according to claim 5, characterized in that The top cover is provided with an anti-reflection film, and the anti-reflection film is located on the light-emitting side surface of the top cover.

7. The light source according to claim 5, characterized in that The light source further includes: a Zener tube, which is arranged in the packaging cavity and is arranged in series with the laser chip.

8. The light source according to claim 1, characterized in that There are multiple laser chips and multiple beam guiding elements. The multiple beam guiding elements are arranged in a one-to-one correspondence with the multiple laser chips. The laser light emitted by each laser chip is guided by a beam guiding element and converged on the same area of ​​the wavelength conversion device.

9. The light source according to claim 1, characterized in that The light source further includes: a diffusion sheet, which is arranged between the wavelength conversion device and the housing and located on the light output path of the laser light.

10. The light source according to claim 1, characterized in that The light source further includes: a collecting lens, which is arranged on the optical path of the laser beam emitted through the wavelength conversion device.

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