Light source module and lighting device

Abstract

The utility model relates to a light source module and a lighting device. The light source module comprises a laser light source, a first wavelength conversion layer, a second wavelength conversion layer and an adjusting mechanism. The laser light source is used for emitting exciting light, and the first wavelength conversion layer is arranged on a light path of the exciting light and used for generating first fluorescent light under excitation of part of the exciting light. The second wavelength conversion layer is provided with an excited surface, the excited surface is located on a light path of the first fluorescence, the first fluorescence irradiates the excited surface and excites the second wavelength conversion layer to generate second fluorescence, the wavelength of the first fluorescence is smaller than that of the second fluorescence, and the exciting light, the first fluorescence and the second fluorescence are mixed to form emergent light. The adjusting mechanism is used for adjusting the area of the excited surface. The light source module can adjust the color temperature of emergent light.

Description

Technical Field

[0001] The present application relates to the technical field of light sources, and in particular to a light source module and a lighting device. Background Art

[0002] White light laser lighting devices are lighting devices that use lasers as light sources and convert or mix lasers of different wavelengths to produce white light through phosphor conversion or mixing. The color temperature and color coordinates of white light are important parameters for measuring the quality of white light. Color temperature refers to the hue of white light, which is generally divided into warm white light (color temperature below 3000K), neutral white light (color temperature between 3000K and 5000K) and cold white light (color temperature above 5000K). Different color temperatures have different effects on human vision and psychology.

[0003] Traditional white light laser lighting devices usually use blue light to excite yellow fluorescent materials to obtain yellow fluorescence, which together with the unabsorbed blue light constitutes white light. The white light emitted by the lighting device prepared by this method has poor quality, high color temperature, blue color coordinates, and cannot adjust the color temperature and color coordinates of white light, so it is not suitable for occasions with high requirements for color temperature and color reproduction. Utility Model Content

[0004] Embodiments of the present application provide a light source module and a lighting device.

[0005] In a first aspect, an embodiment of the present application provides a light source module, including a laser light source, a first wavelength conversion layer, a second wavelength conversion layer, and an adjustment mechanism. The laser light source is used to emit excitation light, the first wavelength conversion layer is arranged on the optical path of the excitation light, and is used to generate a first fluorescence under the excitation of part of the excitation light. The second wavelength conversion layer is provided with a stimulated surface, the stimulated surface is located on the optical path of the first fluorescence and part of the excitation light, part of the first fluorescence and part of the excitation light are irradiated to the stimulated surface and stimulate the second wavelength conversion layer to generate a second fluorescence, the wavelength of the first fluorescence is smaller than the wavelength of the second fluorescence, and part of the excitation light, part of the first fluorescence and the second fluorescence are mixed to form an output light.

[0006] In some optional embodiments, the light source module also includes a shell having a light emitting side and a light incident side, the light incident side being opposite to the light source; the first wavelength conversion layer is arranged on the light incident side, and the second wavelength conversion layer is arranged between the light incident side and the light emitting side.

[0007] In some optional embodiments, the light source module further includes a light-transmitting substrate, which is disposed on the light-incident side and is used to support the first wavelength conversion layer and transmit the excitation light to the first wavelength conversion layer.

[0008] In some optional embodiments, the light source module further includes a selection film, which is disposed between the light-transmitting substrate and the first wavelength conversion layer, and is used to transmit the excitation light and reflect the first fluorescence and the second fluorescence.

[0009] In some optional embodiments, the shell includes a first accommodating portion and a second accommodating portion, the first accommodating portion and the second accommodating portion are continuously connected and the two are internally communicated, the first accommodating portion includes an adjacent top wall and a first side wall, the second accommodating portion includes an adjacent second side wall and a bottom wall, the bottom wall is opposite to the top wall, the second side wall and the first side wall are continuous and are both located between the bottom wall and the top wall; the light output side is arranged on the top wall, the light input side is arranged on the bottom wall, the first wavelength conversion layer is arranged on the bottom wall, and the second wavelength conversion layer is arranged on the first side wall.

[0010] In some optional embodiments, the light source module further includes a reflective layer, which is disposed on the first side wall and the second side wall, and the second wavelength conversion layer is disposed on the reflective layer of the first side wall.

[0011] In some optional embodiments, the inner diameter of the first accommodating portion remains unchanged in the direction from the bottom wall to the top wall; the second side wall is inclined relative to the one side wall, and the inner diameter of the second accommodating portion gradually increases in the direction from the bottom wall to the top wall, and the maximum inner diameter of the second accommodating portion is equal to the inner diameter of the first accommodating portion.

[0012] In some optional embodiments, the adjustment mechanism includes a light blocking member and a driving member, wherein the light blocking member is arranged on a side close to the second wavelength conversion layer, and the driving member is used to drive relative movement between the light blocking member and the second wavelength conversion layer to adjust the area of ​​the stimulated surface.

[0013] In some optional embodiments, the light source module also includes a shell, the first wavelength conversion layer and the second wavelength conversion layer are both arranged in the shell, the light blocking member is movably arranged in the shell, and the driving member is used to drive the light blocking member to move relative to the shell to cover the second wavelength conversion layer.

[0014] In some optional embodiments, the driving member and the housing are movably engaged, or the light blocking member and the housing are movably engaged.

[0015] In some optional embodiments, the shell is provided with a plurality of limiting portions, and the plurality of limiting portions are arranged at intervals along the moving direction of the light blocking member relative to the shell. The adjusting mechanism is provided with a clamping portion, and the clamping portion can be movably limited to any one of the plurality of limiting portions. When the clamping portion is limited to different limiting portions, the area of ​​the stimulated surface is different; in the moving direction, when the clamping portion is limited to a plurality of limiting portions in sequence, the area of ​​the stimulated surface increases or decreases.

[0016] In some optional embodiments, the first wavelength conversion layer includes yellow phosphor and scattering particles, or the first wavelength conversion layer includes yellow-green phosphor and scattering particles.

[0017] In a second aspect, an embodiment of the present application further provides a lighting device, comprising the above-mentioned light source module.

[0018] Compared with the prior art, when the light source module provided by the embodiment of the present application is used, the light source emits an excitation light, the excitation light propagates to the first wavelength conversion layer, the first wavelength conversion layer is excited to generate a first fluorescence, the first fluorescence propagates to the stimulated surface of the second wavelength conversion layer, and part of the first fluorescence excites the second wavelength conversion layer to generate a second fluorescence. The second fluorescence, part of the first fluorescence and part of the excitation light are mixed to form the exit light. The adjustment mechanism can adjust the area of ​​the stimulated surface. The light source module of the embodiment of the present application uses the first wavelength conversion layer as an intermediate layer to convert part of the excitation light into the first fluorescence, and then uses the first fluorescence to excite the second wavelength conversion layer, thereby avoiding the excitation light from directly exciting the second wavelength conversion layer, reducing the possibility of thermal attenuation of the fluorescent material in the second wavelength conversion layer, improving the application stability of the fluorescent material that is easy to attenuate, and extending the service life of the light source module. The light source module of the embodiment of the present application can also adjust the luminous intensity of the second fluorescence through the adjustment mechanism according to different application scenarios and user needs, so as to adjust the color temperature and color coordinates of the exit light, thereby improving the quality and adaptability of the exit light. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a module block diagram of a lighting device provided in one embodiment of the present application.

[0021] Figure 2 It is a simplified structural diagram of a light source module provided in one embodiment of the present application.

[0022] Figure 3 yes Figure 2 A simplified structural diagram of an implementation of an adjustment mechanism of a light source module is shown.

[0023] Figure 4 yes Figure 2 A simplified structural diagram of an implementation scheme of cooperation between the adjustment mechanism and the housing of the light source module is shown.

[0024] Explanation of reference numerals: 100, light source module; 10, laser light source; 20, first wavelength conversion layer; 30, second wavelength conversion layer; 32, stimulated surface; 40, adjustment mechanism; 41, light blocking member; 412, light blocking plate; 43, driving member; 45, clamping portion; 50, housing; 51, light incident side; 52, light exiting side; 53, first accommodating portion; 532, top wall; 534, first side wall; 536, limiting portion; 54, second accommodating portion; 541, second side wall; 543, bottom wall; 60, reflecting layer; 70, light-transmitting substrate; 72, selection film; 200, lighting device; 201, circuit board. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0026] If certain words are used in the specification and claims to refer to specific components, those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use differences in names as a way to distinguish components, but use differences in components' functions as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0027] See also Figure 1 The embodiment of the present application provides a light source module 100 and a lighting device 200. The light source module 100 can be applied to the lighting device 200 to provide lighting.

[0028] This specification does not limit the specific type of the lighting device 200. For example, the lighting device 200 can be a stage light, a car light, a searchlight, etc. As an example, the lighting device 200 can include the above-mentioned light source module 100 and a circuit board 201. The circuit board 201 is electrically connected to the light source module 100 and is used to supply energy to the light source module 100.

[0029] See also Figure 2In this embodiment, the light source module 100 may include a laser light source 10, a first wavelength conversion layer 20, a second wavelength conversion layer 30, and an adjustment mechanism 40. The laser light source 10 is used to emit excitation light P, and the first wavelength conversion layer 20 is arranged on the optical path of the excitation light P, and is used to generate a first fluorescence A under the excitation of part of the excitation light P. The second wavelength conversion layer 30 is provided with a stimulated surface 32, and the stimulated surface 32 is located on the optical path of the first fluorescence A and part of the excitation light P. Part of the first fluorescence A and part of the excitation light P are irradiated to the stimulated surface 32 and stimulate the second wavelength conversion layer 30 to generate a second fluorescence B. The wavelength of the first fluorescence A is smaller than the wavelength of the second fluorescence B, and the second fluorescence B, part of the first fluorescence A, and part of the excitation light P are mixed to form an output light. The adjustment mechanism 40 is used to adjust the area of ​​the stimulated surface 32.

[0030] When in use, the laser light source 10 emits an excitation light P, which propagates to the first wavelength conversion layer 20, and the first wavelength conversion layer 20 is excited to generate a first fluorescence A. Part of the first fluorescence A propagates and part of the excitation light P to the stimulated surface 32 of the second wavelength conversion layer 30, and the second wavelength conversion layer 30 is excited to generate a second fluorescence B. The second fluorescence B, part of the first fluorescence A, and part of the excitation light P are mixed to form an emitted light. The adjustment mechanism 40 can adjust the area of ​​the stimulated surface 32. As an example, the second wavelength conversion layer 30 includes at least red phosphor, and the second fluorescence B includes at least red fluorescence. If the excitation light P is a blue laser and the first fluorescence A is a yellow-green mixed fluorescence, part of the excitation light P, part of the first fluorescence A, and the second fluorescence B are mixed to form white light emission. The addition of red fluorescence can reduce the color temperature of the emitted white light, and the light blocking member 41 changes the area of ​​the stimulated surface 32 relative to the activity of the second wavelength conversion layer 30, so that the emission amount of red fluorescence can be further adjusted.

[0031] The light source module 100 of the embodiment of the present application uses the first wavelength conversion layer 20 as an intermediate layer to convert part of the excitation light P into the first fluorescence A, and then uses the first fluorescence A to excite the second wavelength conversion layer 30, thereby reducing the possibility of thermal decay of the fluorescent material (such as red fluorescent powder) in the second wavelength conversion layer 30, improving the application stability of the fluorescent material that is easy to decay, and extending the service life of the light source module. The light source module 100 of the embodiment of the present application can also adjust the luminous intensity of the second fluorescence B through the adjustment mechanism 40 according to different application scenarios and user needs, so as to adjust the color temperature and color coordinates of the emitted light, thereby improving the quality and adaptability of the emitted light.

[0032] In this embodiment, the laser light source 10 is a blue laser light source, which is used to emit excitation light P to excite the first wavelength conversion layer 20 to generate the first fluorescence A. This specification does not limit the specific type of the excitation light P. For example, the excitation light P can be a blue laser or an ultraviolet laser. In this embodiment, the excitation light P is a blue laser, and the laser light source 10 is a blue laser.

[0033] The first wavelength conversion layer 20 includes at least one phosphor. For example, the first wavelength conversion layer 20 may include yellow phosphor. Then, the first fluorescence A generated by the first wavelength conversion layer 20 when excited includes yellow fluorescence. The first wavelength conversion layer 20 is arranged on the optical path of the excitation light P. The excitation light P is used to excite the phosphor to generate fluorescence. The luminescence mechanism of the phosphor is to excite the molecules or atoms of the substance by high energy, so that they enter the excited state. When they de-excite from the excited state to the ground state, they release photons, that is, generate fluorescence. In this embodiment, the blue laser enters the first wavelength conversion layer 20, and the first wavelength conversion layer 20 generates scattered light. The scattered light includes the yellow fluorescence generated by the yellow phosphor under the excitation of the blue laser and part of the blue laser that is not absorbed. The yellow fluorescence enters the second wavelength conversion layer 30, excites the red phosphor, and generates red fluorescence. The blue laser, the yellow fluorescence of the first wavelength conversion layer 20, and the red fluorescence of the second wavelength conversion layer 30 are mixed to form white light, that is, the output light of the light source module 100. Among them, the intensity of the blue laser is reduced after being scattered in the first wavelength conversion layer 20, and the red phosphor can also be directly excited to produce red fluorescence without affecting the stability of the red phosphor. The blue laser, yellow fluorescence, and red fluorescence are mixed to form white light. The addition of red fluorescence greatly improves the color rendering index of the white light output and reduces the color temperature of the white light output, thereby increasing the scope of application of the light source module 100 provided in the embodiment of the present application.

[0034] In another embodiment, the first wavelength conversion layer 20 may also include two kinds of phosphors. For example, the first wavelength conversion layer 20 may include yellow phosphor and green phosphor. Then, the first fluorescence A generated by the first wavelength conversion layer 20 when excited includes yellow fluorescence and green fluorescence. The yellow phosphor and the green phosphor may be placed independently or mixed to form a yellow-green mixed phosphor. The wavelength of the yellow fluorescence and the wavelength of the green fluorescence are both smaller than the wavelength of the red fluorescence, so that the red phosphor of the second wavelength conversion layer 30 can be excited by the first fluorescence A to generate red fluorescence. In other embodiments, if the excitation light P is an ultraviolet laser, the first wavelength conversion layer 20 may also include blue phosphor and green phosphor. Then, the first fluorescence A generated by the first wavelength conversion layer 20 when excited by the ultraviolet laser includes yellow fluorescence and green fluorescence.

[0035] In this embodiment, the first wavelength conversion layer 20 may further include scattering particles, and the scattering particles and yellow phosphor (or yellow-green phosphor) may be prepared together into a phosphor sheet. The scattering particles are beneficial to the heat dissipation of the phosphor, and on the other hand, they can scatter the excitation light P, reduce the laser intensity, thereby reducing the possibility of thermal quenching when the scattered excitation light P excites the red phosphor, and improving the application stability of the red phosphor.

[0036] The present specification does not limit the specific structure of the second wavelength conversion layer 30 . In some embodiments, the second wavelength conversion layer 30 may further include a substrate for coating fluorescent powder and other structures.

[0037] In this embodiment, the light source module 100 may further include a housing 50, and the housing 50 may have a light incident side 51 and a light exiting side 52, and the light incident side 51 and the laser light source 10 are arranged opposite to each other. The first wavelength conversion layer 20 is arranged on the light incident side 51, and the second wavelength conversion layer 30 is arranged between the light incident side 51 and the light exiting side 52. The laser light source 10 emits excitation light P, and the excitation light P enters the housing 50 through the light incident side 51, excites the first wavelength conversion layer 20 to generate the first fluorescence A, and the first fluorescence A excites the second wavelength conversion layer 30 to generate the second fluorescence B. The excitation light P, the first fluorescence A, and the second fluorescence B are mixed and emitted through the light exiting side 52 to form the exit light.

[0038] In this embodiment, the housing 50 includes a first accommodating portion 53 and a second accommodating portion 54, which are connected in series and are internally communicated with each other. The first accommodating portion 53 includes an adjacent top wall 532 and a first side wall 534, and the second accommodating portion 54 includes an adjacent second side wall 541 and a bottom wall 543. The bottom wall 543 is opposite to the top wall 532, and the second side wall 541 and the first side wall 534 are connected and are both located between the bottom wall 543 and the top wall 532.

[0039] The light-emitting side 52 of the housing 50 is disposed on the top wall 532, and the light-entering side 51 of the housing 50 is disposed on the bottom wall 543. The light source module 100 may further include a reflective layer 60, which is disposed on the inner wall of the housing 50, specifically, the reflective layer 60 is disposed on the first side wall 534 and the second side wall 541. The reflective layer 60 is used to reflect the light inside the housing 50. The first wavelength conversion layer 20 is disposed on the light-entering side 51, for example, on the bottom wall 543; the second wavelength conversion layer 30 is disposed on the reflective layer 60 on the first side wall 534.

[0040] When in use, the excitation light P enters the housing 50 from the light incident side 51, part of the excitation light P excites the first wavelength conversion layer 20 to generate the first fluorescence A, the light scattered and emitted by the first wavelength conversion layer 20 includes the excitation light P and the first fluorescence A, part of the excitation light P and part of the first fluorescence A are directly emitted to the light emitting side 52, part of the excitation light P and part of the first fluorescence A are transmitted to the second wavelength conversion layer 30 on the reflective layer 60, and excite the second wavelength conversion layer 30 to generate the second fluorescence B, and the second fluorescence B is reflected by the reflective layer 60 and transmitted to the light emitting side 52. The excitation light P, the first fluorescence A and the second fluorescence B are mixed and emitted through the light emitting side 52 to form the emitted light.

[0041] The present specification does not limit the specific type of the reflective layer 60. The reflective layer 60 may be a reflective film, such as a dielectric film, a metal reflective film, a diffuse reflective film, etc., or the reflective layer 60 may be a reflective paint. As an example, the reflective layer 60 is a reflective paint, and the reflective layer 60 is coated on the inner wall (the first side wall 534 and the second side wall 541) of the housing 50. The second wavelength conversion layer 30 is coated on the reflective layer 60, and the stimulated surface 32 of the second wavelength conversion layer 30 is located on the side of the second wavelength conversion layer 30 away from the reflective layer 60.

[0042] This specification does not limit the specific shape and structure of the shell 50. The shell 50 can be cylindrical, bowl-shaped, or have an irregular shape. For example, in this embodiment, the first accommodating portion 53 can be a cylindrical shell (e.g., cylindrical), and the second accommodating portion 54 can be a conical shell (e.g., conical). Specifically in this embodiment, the first accommodating portion 53 is a cylindrical shell, and its inner diameter remains unchanged in the direction from the bottom wall 543 to the top wall 532. The second accommodating portion 54 is a conical shell, and the second side wall 541 is inclined relative to the first side wall 534, and the inner diameter of the second accommodating portion 54 gradually increases in the direction from the bottom wall 543 to the top wall 532. The maximum inner diameter of the second accommodating portion 54 is equal to the inner diameter of the first accommodating portion 53, so that the first side wall 534 and the second side wall 541 can be connected continuously. The structural shape of the shell 50 increases the emission angle of the first fluorescence A generated by the first wavelength conversion layer 20 at the light incident side 51, and makes the light beams (excitation light P, first fluorescence A and second fluorescence B) inside the shell 50 converge at the light output side 52, thereby improving the intensity of the output light.

[0043] In this embodiment, the light source module 100 may further include a light-transmitting substrate 70, which is disposed on the light-entering side 51, and is used to support the first wavelength conversion layer 20 and transmit the excitation light P to the first wavelength conversion layer 20. This specification does not limit the specific material of the light-transmitting substrate 70, and the light-transmitting substrate 90 is a transparent material substrate, for example, the light-transmitting substrate 90 may be a sapphire transparent substrate or a glass substrate.

[0044] The light source module 100 may further include a selection film 72, which is disposed between the light-transmitting substrate 70 and the first wavelength conversion layer 20, and is used to transmit the excitation light P and reflect the first fluorescence A and the second fluorescence B. This specification does not limit the specific type of the selection film 72, for example, the selection film 72 may be a transflective lens or a transflective film. As an example, the excitation light P is a blue laser, the transparent substrate 70 is a sapphire transparent substrate, the first fluorescence A includes yellow fluorescence, and the second fluorescence B includes red fluorescence, and the selection film 72 is a thin film that can transmit the blue laser and reflect the yellow fluorescence and the red fluorescence.

[0045] In this embodiment, the adjustment mechanism 40 is disposed on the housing 50, and is used to shield the second wavelength conversion layer 30 to adjust the area of ​​its stimulated surface 32. The stimulated surface 32 of the second wavelength conversion layer 30 is located on the optical path of the first fluorescence A. The stimulated surface 32 can be understood as the surface of the second wavelength conversion layer 30 irradiated by the first fluorescence A and the excitation light P. The size of the stimulated surface 32 affects the efficiency of the second wavelength conversion layer 30 being excited by the first fluorescence A, thereby affecting the light output of the second fluorescence B. The adjustment mechanism 40 is used to adjust the emission rate of the second fluorescence B, thereby adjusting the color temperature of the output light of the light source module 100.

[0046] The adjustment mechanism 40 may include a light blocking member 41 and a driving member 43. The light blocking member 41 is movably disposed in the housing 50 and is located on a side close to the second wavelength conversion layer 30. The driving member 43 is used to drive the light blocking member 41 and the second wavelength conversion layer 30 to move relative to each other to adjust the area of ​​the stimulated surface 32. Specifically, the light blocking member 41 is movably disposed in the housing 50, and the driving member 43 is used to drive the light blocking member 41 to move relative to the housing 50 to cover the second wavelength conversion layer 30. The driving member 43 can drive the light blocking member 41 to move to cover the surface of the second wavelength conversion layer 30 that is away from the reflective layer 60, so as to adjust the coverage rate of the light blocking member 41 on the second wavelength conversion layer 30, that is, to adjust the area of ​​the stimulated surface 32, and then adjust the emission amount of the second fluorescence B generated by the stimulation of the second wavelength conversion layer 30.

[0047] In other embodiments, the second wavelength conversion layer 30 can also be movably disposed in the shell 50, and the driving member 43 is transmission-connected to the second wavelength conversion layer 30. The driving member 43 can drive the second wavelength conversion layer 30 to move relative to the light blocking member 41 to adjust the relative positions of the two, that is, to adjust the area of ​​the stimulated surface 32, and thereby adjust the emission amount of the second fluorescence B generated by the second wavelength conversion layer 30 when stimulated.

[0048] The present specification does not limit the specific shape and movement trajectory of the light blocking member 41. For example, the light blocking member 41 can be provided in a cylindrical shape with two ends passing through. The light blocking member 41 is provided in the first side wall 534 and can move in the direction from the light incident side 51 to the light exiting side 52 under the drive of the driving member 43. The second wavelength conversion layer 30 is provided on the first side wall 534. When the light blocking member 41 moves, it shields part of the second wavelength conversion layer 30, thereby blocking part of the light beam scattered by the first wavelength conversion layer 20 from irradiating the second wavelength conversion layer 30.

[0049] See also Figure 3 In other embodiments, the light blocking member 41 may also include a plurality of light blocking plates 412, and the plurality of light blocking plates 412 are arranged in the shell 50 along the circumference of the shell 50. The number of driving members 43 may be one or more. If the number of driving members 43 is set to one, one driving member 43 can drive the plurality of light blocking plates 412 to move synchronously to cover the second wavelength conversion layer 30. If the number of driving members 43 is set to multiple, the plurality of driving members 43 are arranged in a one-to-one correspondence with the plurality of light blocking plates 412, and the driving members 43 are transmission-connected to the corresponding light blocking plates 412, and each driving member 43 can independently control the movement of the corresponding light blocking plate 412 relative to the shell 50, thereby improving the degree of freedom of adjusting the color temperature of the emitted light.

[0050] This specification does not limit the specific structure of the driving member 43. The driving member 43 may include a driving motor disposed outside the shell 50 and a transmission structure that is transmission-connected between the driving motor and the light blocking member 41. As an example, the driving motor may be a rotary motor, and the transmission structure may be a screw rod and a screw rod mother transmission structure. The driving motor realizes the movement of the light blocking member 41 by driving the transmission structure.

[0051] In some embodiments, in order to increase the upper limit of the emission amount of the second fluorescence B, the light blocking member 41 may have two degrees of freedom of movement. Taking a light blocking plate 412 as an example, the initial position of the light blocking plate 412 may be arranged in contact with the first side wall 534 and located on the side of the second wavelength conversion layer 30 away from the top wall 532. The side of the light blocking plate 412 away from the first side wall 534 is flush with the stimulated surface 32 of the second wavelength conversion layer 30. At this time, the coverage rate of the light blocking plate 412 on the second wavelength conversion layer 30 is 0, and the emission amount of the second fluorescence B reaches the maximum. The driving member 43 may include a transmission mechanism with two degrees of freedom. For example, the driving member 43 may realize the movement of the light blocking plate 412 in two directions through two sets of screws and screw mother transmission structures whose moving directions intersect. When the color temperature of the emitted light needs to be adjusted, the driving member 43 first drives the light blocking plate 412 to move away from the first side wall 534 toward the center of the housing 50 until the distance between the light blocking plate 412 and the first side wall 534 is greater than the thickness of the second wavelength conversion layer 30. The driving member 43 then drives the light blocking plate 412 to move from the light incident side 51 to the light exiting side 52 to cover the second wavelength conversion layer 30 , reduce the area of ​​the stimulated surface 32 , and reduce the emission amount of the second fluorescent light B, thereby achieving the purpose of adjusting the color temperature.

[0052] Please also see Figure 2 and Figure 4 In some embodiments, the driving member 43 can be movably connected to the housing 50, or the light blocking member 41 and the housing 50 can be movably connected, so that the area adjustment of the stimulated surface 32 can be changed in stages. Specifically, the housing 50 can be provided with a plurality of limiting portions 536, and the plurality of limiting portions 536 are arranged at intervals along the moving direction of the light blocking member 41 relative to the housing 50. The adjustment mechanism 40 is provided with a clamping portion 45, and the clamping portion 45 can be movably limited to any one of the plurality of limiting portions 536. When the clamping portion 45 is limited to different limiting portions 45, the area of ​​the stimulated surface 32 is different. When the clamping portion 45 is sequentially limited to a plurality of limiting portions 45 in the moving direction of the light blocking member 41, the area of ​​the stimulated surface 32 increases or decreases. When the driving member 43 drives the driving member 41 to move relative to the housing 50, the clamping portion 45 is limited to different limiting portions 536. The multiple limiting portions 536 allow the area of ​​the stimulated surface 32 to be changed in stages, thereby improving the freedom and accuracy of color temperature adjustment.

[0053] The limiting portion 536 may be disposed on the first side wall 534. The limiting portion 536 may be a limiting groove provided on the first side wall 534, or a limiting protrusion integrally formed on the first side wall 534. In the present embodiment, the limiting portion 536 is a limiting groove provided on the first side wall 534. A plurality of limiting grooves are arranged at intervals along the direction from the top wall 532 to the bottom wall 543, and are all located on one side of the second wavelength conversion layer 30. The present specification does not limit the specific position of the clamping portion 45. The clamping portion 45 may be disposed on the driving member 43. For example, the driving member 43 may include a driving source and a transmission member, and the transmission member is transmission-connected between the driving source and the light blocking member 41. The clamping portion 45 is disposed on the transmission member. As an example, the transmission member is a transmission rod. The clamping portion 45 is connected to one side of the transmission rod. The clamping portion 45 may be a spring pin. The clamping portion 45 can be movably limited to the above-mentioned limiting groove (limiting portion 536). When the driving source drives the transmission rod to move, the clamping portion 45 is sequentially limited to multiple limiting portions 536, so that the area of ​​the stimulated surface 32 changes in stages. The distance between two adjacent limiting portions 536 can be the same. This embodiment does not limit the specific distance between two adjacent limiting portions 536. For example, when the clamping portion 45 is sequentially limited to two adjacent limiting portions 536, the area change of the stimulated surface 32 can be 10%, 15%, 20%, etc.

[0054] In other embodiments, the clamping portion 45 may also be disposed on the light blocking member 41. When the driving member 43 drives the light blocking member 41 to move relative to the shell 50, the clamping portion 45 is sequentially limited to different limiting portions 536 to phase-wise change the area of ​​the stimulated surface 32, thereby improving the freedom and accuracy of color temperature adjustment.

[0055] Please refer again Figure 3 In order to improve the utilization rate of the light beam, in the present embodiment, the light blocking member 41 is a reflector. When the light blocking member 41 covers a portion of the second wavelength conversion layer 30, the light beam (excitation light P, first fluorescence A) scattered by the first wavelength conversion layer 20 will be reflected to the light output side 52 or to another part of the second wavelength conversion layer 30 in the housing 50 when it is irradiated to the light blocking member 41.

[0056] In this embodiment, when the light source module 100 is used, the excitation light P is transmitted through the light-transmitting substrate 70 and enters the first wavelength conversion layer 20, generating scattered light in various directions, for example: light scattered to the second wavelength conversion layer 30, light directly emitted to the light-emitting side 52, and light scattered to the light-blocking member 41, and the scattered light includes the excitation light P and the first fluorescence A. The excitation light P, the first fluorescence A, and the second fluorescence B are mixed to form the emitted light of the light source module 100. The light source module 100 provided in the embodiment of the present application controls the emission amount of the second wavelength conversion layer 30 through the adjustment mechanism 40, and thus the color temperature of the emitted light can be continuously adjusted.

[0057] When the light source module 100 provided in the embodiment of the present application is used, the laser light source 10 emits an excitation light P, which propagates to the first wavelength conversion layer 20, and the first wavelength conversion layer 20 is excited to generate a first fluorescence A. Part of the first fluorescence A and part of the excitation light P propagate to the second wavelength conversion layer 30, and the second wavelength conversion layer 30 is excited to generate a second fluorescence B. The second fluorescence B and part of the first fluorescence A are mixed to form an emitted light. The driving member 43 drives the light blocking member 41 to move relative to the second wavelength conversion layer 30 to adjust the area of ​​the stimulated surface 32.

[0058] The light source module 100 of the embodiment of the present application uses the first wavelength conversion layer 20 as an intermediate layer to convert part of the excitation light P into the first fluorescence A, and then uses the first fluorescence A to excite the second wavelength conversion layer 30, thereby reducing the possibility of thermal decay of the fluorescent material (such as red fluorescent powder) in the second wavelength conversion layer 30, improving the application stability of the fluorescent material that is easy to decay, and extending the service life of the light source module. The light source module 100 of the embodiment of the present application can also adjust the luminous intensity of the second fluorescence B through the adjustment mechanism 40 according to different application scenarios and user needs, so as to adjust the color temperature and color coordinates of the emitted light, thereby improving the quality and adaptability of the emitted light.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application 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. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A light source module, characterized in that: The light source module comprises: A light source, for emitting excitation light; A first wavelength conversion layer is disposed on the optical path of the excitation light and is used to generate a first fluorescence under the excitation of a part of the excitation light; a second wavelength conversion layer, wherein the second wavelength conversion layer is provided with a stimulated surface, the stimulated surface is located on an optical path of the first fluorescent light and part of the excitation light, part of the first fluorescent light and part of the excitation light are irradiated onto the stimulated surface and stimulate the second wavelength conversion layer to generate a second fluorescent light, the wavelength of the first fluorescent light is smaller than the wavelength of the second fluorescent light, and part of the excitation light, part of the first fluorescent light and part of the second fluorescent light are mixed to form an emitted light; and An adjusting mechanism is used to adjust the area of ​​the stimulated surface.

2. The light source module according to claim 1, characterized in that: The light source module also includes a shell, which has a light emitting side and a light incident side, and the light incident side is opposite to the light source; the first wavelength conversion layer is arranged on the light incident side, and the second wavelength conversion layer is arranged between the light incident side and the light emitting side.

3. The light source module according to claim 2, characterized in that: The light source module further includes a light-transmitting substrate, which is disposed on the light-incident side and is used to support the first wavelength conversion layer and transmit the excitation light to the first wavelength conversion layer.

4. The light source module according to claim 3, characterized in that: The light source module further includes a selection film, which is disposed between the light-transmitting substrate and the first wavelength conversion layer, and is used for transmitting the excitation light and reflecting the first fluorescence and the second fluorescence.

5. The light source module according to claim 2, characterized in that: The shell includes a first accommodating portion and a second accommodating portion, the first accommodating portion and the second accommodating portion are continuously connected and the two are internally communicated, the first accommodating portion includes an adjacent top wall and a first side wall, the second accommodating portion includes an adjacent second side wall and a bottom wall, the bottom wall is opposite to the top wall, the second side wall and the first side wall are continuous and are both located between the bottom wall and the top wall; the light emitting side is arranged on the top wall, the light incident side is arranged on the bottom wall, the first wavelength conversion layer is arranged on the bottom wall, and the second wavelength conversion layer is arranged on the first side wall.

6. The light source module according to claim 5, characterized in that: The light source module further includes a reflective layer, wherein the reflective layer is disposed on the first side wall and the second side wall, and the second wavelength conversion layer is disposed on the reflective layer of the first side wall.

7. The light source module according to claim 5, characterized in that: The inner diameter of the first accommodating portion remains unchanged in the direction from the bottom wall to the top wall; the second side wall is inclined relative to the one side wall, and the inner diameter of the second accommodating portion gradually increases in the direction from the bottom wall to the top wall, and the maximum inner diameter of the second accommodating portion is equal to the inner diameter of the first accommodating portion.

8. The light source module according to claim 1, characterized in that: The adjustment mechanism includes a light blocking member and a driving member. The light blocking member is arranged on a side close to the second wavelength conversion layer. The driving member is used to drive the light blocking member and the second wavelength conversion layer to move relative to each other to adjust the area of ​​the stimulated surface.

9. The light source module according to claim 8, characterized in that: The light source module also includes a shell, the first wavelength conversion layer and the second wavelength conversion layer are both arranged in the shell, the light blocking member can be movably arranged in the shell, and the driving member is used to drive the light blocking member to move relative to the shell to cover the second wavelength conversion layer.

10. The light source module according to claim 9, characterized in that: The driving member is movably connected to the housing, or the light blocking member is movably connected to the housing.

11. The light source module according to claim 10, characterized in that: The shell is provided with a plurality of limiting parts, and the plurality of limiting parts are arranged at intervals along the moving direction of the light blocking member relative to the shell. The adjustment mechanism is provided with a clamping part, and the clamping part can be movably limited to any one of the plurality of limiting parts. When the clamping part is limited to different limiting parts, the area of ​​the stimulated surface is different; in the moving direction, when the clamping part is limited to the plurality of limiting parts in sequence, the area of ​​the stimulated surface increases or decreases.

12. The light source module according to any one of claims 1 to 11, characterized in that: The first wavelength conversion layer includes yellow phosphor and scattering particles, or the first wavelength conversion layer includes yellow-green phosphor and scattering particles.

13. A lighting device, characterized in that: include: A light source module as claimed in any one of claims 1 to 12.

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