Light source device and vehicle lamp

Abstract

The utility model discloses a light source device and a vehicle lamp. The light source device comprises an exciting light module, a fluorescent module, a lens module and a guiding module. The excitation light module is used for generating excitation light. The fluorescent module comprises a fluorescent powder piece which is arranged on a light path where the exciting light is located and used for generating fluorescent light under excitation of the exciting light. The lens module is arranged on a light path where the exciting light and the fluorescent light are located, and is used for deflecting the exciting light, so that the deflected exciting light enters the fluorescent powder sheet; the lens module is also used for converging fluorescence. The guiding module comprises a scanning mirror and a controller, and the scanning mirror is rotatably arranged on a light path where the exciting light is located and used for reflecting the exciting light to the lens module; and the controller is electrically connected with the scanning mirror and is used for controlling the scanning mirror to rotate, so that the position of a light spot formed on the fluorescent powder sheet by the exciting light is continuously changed. The architecture of the self-adaptive high beam is realized by adopting the mode of exciting the fluorescence by the exciting light, a DMD (Digital Micromirror Device) does not need to be arranged, and the hardware cost is lower.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and more specifically, to a light source device and a vehicle headlight. Background Art

[0002] With the increasing popularity and development of vehicles, Adaptive Driving Beam (ADB) has been increasingly favored by consumers due to its intelligent headlight system. Existing ADB can automatically adjust parameters such as the brightness and illumination range of the high beam according to changes in the road, weather, and surrounding environment to improve the safety of the vehicle during driving.

[0003] Specifically, in order to achieve the intelligence of ADB illumination, R & D personnel will adopt a Digital Light Processing (DLP) solution in ADB. The core of the DLP solution is a Digital Micro-mirror Device (DMD). The DMD is a micro-mirror array composed of millions of micro-mirrors, and each micro-mirror can be individually controlled to deflect the angle, so as to reflect the light emitted by the light source to achieve intelligent illumination of the high beam.

[0004] However, the existing DLP solution has the problem of high hardware cost. Summary of the Utility Model

[0005] Embodiments of this application provide a light source device and a vehicle headlight.

[0006] According to a first aspect of this application, embodiments of this application provide a light source device, which includes an excitation light module, a fluorescence module, a lens module, and a guiding module. Among them, the excitation light module is used to generate excitation light. The fluorescence module includes a phosphor sheet, and the phosphor sheet is arranged on the optical path where the excitation light is located, and is used to generate fluorescence under the excitation of the excitation light. The lens module is arranged on the optical paths where the excitation light and the fluorescence are located, and is used to deflect the excitation light so that the deflected excitation light is incident on the phosphor sheet; the lens module is also used to converge the fluorescence. The guiding module includes a scanning mirror and a controller. The scanning mirror is rotatably arranged on the optical path where the excitation light is located, and is used to reflect the excitation light to the lens module; the controller is electrically connected to the scanning mirror and is used to control the rotation of the scanning mirror so that the position of the light spot formed by the excitation light on the phosphor sheet changes continuously.

[0007] Wherein, in some possible embodiments, the light-emitting surface of the phosphor sheet is inclined towards the side where the scanning mirror is located, so that the included angle between the light-emitting surface of the phosphor sheet and the optical axis of the lens module is an acute angle.

[0008] In some possible embodiments, the angle between the light-emitting surface of the phosphor sheet and the optical axis of the lens module is a first angle, and the angle value of the first angle is greater than or equal to 60 degrees and less than 90 degrees.

[0009] Among them, in some possible embodiments, the angle between the optical axis direction of the excitation light incident on the phosphor sheet and the light emitting surface of the phosphor sheet is a second angle, and the angle value of the second angle is greater than 15 degrees; the angle value of the second angle is less than or equal to 45 degrees.

[0010] Among them, in some possible embodiments, the lens module includes a first lens and a second lens, and the first lens and the second lens are arranged in sequence on the optical path where the fluorescence is located; the first lens is also arranged on the optical path where the excitation light is located, and is used to deflect the excitation light to the phosphor sheet.

[0011] Among them, in some possible embodiments, the second lens includes a light incident surface, an avoidance surface and a light emitting surface, the fluorescence is incident on the second lens through the light incident surface, and is emitted through the light emitting surface; the avoidance surface of the second lens is located between the light incident surface of the second lens and the light emitting surface of the second lens, and the avoidance surface of the second lens is spaced apart from the scanning mirror so that the second lens is not located on the optical path where the excitation light is located.

[0012] Among them, in some possible embodiments, the second lens includes a light emitting surface, and the fluorescence is emitted through the light emitting surface; the scanning mirror is arranged at an interval from the light emitting surface so that the excitation light is incident on the second lens through the light emitting surface, and the second lens is also used to deflect the excitation light to the first lens.

[0013] Among them, in some possible embodiments, the excitation light includes a first sub-excitation light and a second sub-excitation light, and the phosphor sheet generates fluorescence under the excitation of the first sub-excitation light; the fluorescent module also includes a reflective film, which is arranged on the side of the phosphor sheet away from the lens module, and is used to reflect the second sub-excitation light and part of the fluorescence, so that the second sub-excitation light and the fluorescence are combined and incident on the lens module.

[0014] Among them, in some possible embodiments, the phosphor sheet has a first direction and a second direction, the length of the phosphor sheet in the first direction is greater than the length of the phosphor sheet in the second direction, and the first direction and the second direction intersect; the ratio of the length of the light spot in the first direction to the length of the phosphor sheet in the first direction is less than or equal to 0.15; the ratio of the length of the light spot in the second direction to the length of the phosphor sheet in the second direction is greater than or equal to 0.95; and the controller is used to control the rotation of the scanning mirror so that the light spot moves on the phosphor sheet along the first direction.

[0015] Among them, in some possible embodiments, the phosphor sheet has a first direction and a second direction. The length of the phosphor sheet in the first direction is greater than the length of the phosphor sheet in the second direction, and the first direction and the second direction intersect. The ratio between the length of the light spot in the first direction and the length of the phosphor sheet in the first direction is less than or equal to 0.15. The ratio between the length of the light spot in the second direction and the length of the phosphor sheet in the second direction is less than or equal to 0.15. The controller is used to control the rotation of the scanning mirror so that the light spot can move along the first direction and the second direction on the phosphor sheet respectively.

[0016] According to the second aspect of the present application, an embodiment of the present application further provides a vehicle headlight, and the vehicle headlight includes the above-mentioned light source device.

[0017] The present application provides a light source device and a vehicle headlight. In this light source device, the excitation light generated by the excitation light module is incident on the lens module under the reflection of the scanning mirror, and the excitation light is then incident on the phosphor sheet under the deflection of the lens module. Here, "deflection" can be understood as a process in which the lens module refracts the excitation light at least once. The phosphor sheet will generate fluorescence under the excitation of the excitation light, and the fluorescence is projected to the outside after being converged by the lens module.

[0018] Furthermore, the scanning mirror will rotate under the control of the controller to adjust the position of the light spot formed by the excitation light on the phosphor sheet, and thus the exit position of the fluorescence from the lens module can be adjusted. When this light source device is used in a vehicle headlight, the adaptive lighting function of the vehicle headlight can be realized. Therefore, the present application adopts the method of exciting fluorescence with excitation light to realize the architecture of the adaptive high beam. Compared with the DLP scheme that requires a DMD in the prior art, the present application does not need to set a DMD, and the hardware cost is lower.

[0019] In addition, the lens module in the present application is simultaneously arranged on the optical paths of the excitation light and the fluorescence. On the one hand, the lens module is used to deflect the excitation light to the surface of the phosphor sheet so that the phosphor sheet can be smoothly excited to generate fluorescence under the action of the excitation light. On the other hand, the lens module is also used to converge the fluorescence to improve the energy utilization efficiency of the fluorescence. Therefore, by reusing the lens module in the present application, the overall optical path of the light source device can be made more compact and reasonable, which is beneficial to the miniaturization design of the vehicle headlight equipped with this light source device, and thus improves the market competitiveness of the vehicle headlight. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is the structural block diagram of the vehicle lamp provided by the embodiment of the present application.

[0022] Figure 2 is Figure 1 the structural schematic diagram of the light source device in the vehicle lamp shown.

[0023] Figure 3 is Figure 1 another structural schematic diagram of the light source device in the vehicle lamp shown.

[0024] Figure 4 is Figure 3 the structural schematic diagram of the fluorescent module in the light source device shown.

[0025] Figure 5 is Figure 3 the optical path schematic diagram corresponding to the fluorescent module in the light source device shown.

[0026] Figure 6 is Figure 1 yet another structural schematic diagram of the light source device in the vehicle lamp shown.

[0027] Figure 7 is Figure 1 still another structural schematic diagram of the light source device in the vehicle lamp shown.

[0028] Figure 8 is Figure 3 a schematic diagram of a scanning path of the light spot in the light source device shown.

[0029] Figure 9 is Figure 3 a schematic diagram of the scanning direction of the scanning mirror in the light source device shown.

[0030] Figure 10 is Figure 3 another schematic diagram of a scanning path of the light spot in the light source device shown. Detailed implementation manners

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0032] Please refer to Figure 1, this embodiment provides a light source device 100 and a vehicle headlight 200 configured with the light source device 100. The vehicle headlight 200 is used to provide road lighting for the vehicle and emit driving signals (for example, turning signals). Specifically, the vehicle headlight 200 can be a high beam, a low beam, a turn signal, and so on.

[0033] In this embodiment, the vehicle headlight 200 can include a light source device 100 and a housing 210. Among them, the light source device 100 is disposed in the housing 210, and the housing 210 plays a role in fixing and protecting the light source device 100. The light source device 100 is used to generate a specified light beam L, and the specified light beam L can be projected to the outside through a light exit window (not shown in the figure) provided on the housing 210 to achieve the lighting function of the vehicle.

[0034] Please refer to Figure 2 , the light source device 100 can include an excitation light module 10, a fluorescence module 30, a lens module 50, and a guiding module 70. Among them, the excitation light module 10 is used to generate excitation light E. The fluorescence module 30 can include a phosphor sheet 320, and the phosphor sheet 320 is disposed on the optical path where the excitation light E is located, and it is used to generate fluorescence F under the excitation of the excitation light E. The lens module 50 is disposed on the optical paths where the excitation light E and the fluorescence F are located, and it is used to deflect the excitation light E so that the deflected excitation light E is incident on the phosphor sheet 320. The lens module 50 is also used to converge the fluorescence F. The guiding module 70 can include a scanning mirror 720 and a controller 740. The scanning mirror 720 is rotatably disposed on the optical path where the excitation light E is located, and it is used to reflect the excitation light E to the lens module 50. The controller 740 is electrically connected to the scanning mirror 720, and it is used to control the rotation of the scanning mirror 720 so that the position of the light spot formed by the excitation light E on the phosphor sheet 320 changes continuously.

[0035] This embodiment provides a light source device 100. In the light source device 100, the excitation light E generated by the excitation light module 10 is incident on the lens module 50 under the reflection of the scanning mirror 720, and the excitation light E is then incident on the phosphor sheet 320 under the deflection of the lens module 50. Here, "deflection" can be understood as a process in which the lens module 50 refracts the excitation light E at least once. The phosphor sheet 320 generates fluorescence F under the excitation of the excitation light E, and the fluorescence F is projected to the outside after being converged by the lens module 50.

[0036] Further, the scanning mirror 720 rotates under the control of the controller 740 to adjust the position of the light spot formed by the excitation light E on the phosphor sheet 320, thereby adjusting the exit position of the fluorescence F from the lens module 50. When the light source device 100 is used in the vehicle headlight 200, the adaptive lighting function of the vehicle headlight 200 can be realized. Therefore, in this embodiment, the architecture of the adaptive high beam is realized by using the excitation light to excite the fluorescence. Compared with the DLP scheme that requires the use of DMD in the prior art, this embodiment does not need to set DMD, and the hardware cost is lower.

[0037] In addition, the lens module 50 in this embodiment is disposed on the optical paths of both the excitation light E and the fluorescence F. On the one hand, the lens module 50 is used to deflect the excitation light E to the surface of the phosphor sheet 320, so that the phosphor sheet 320 can smoothly excite the fluorescence F under the action of the excitation light E. On the other hand, the lens module 50 is also used to converge the fluorescence F to improve the energy utilization efficiency of the fluorescence F. Therefore, by multiplexing the lens module 50 in this embodiment, the overall optical path of the light source device 100 can be made more compact and reasonable, which is beneficial to the miniaturization design of the vehicle headlight 200 configured with the light source device 100, thereby improving the market competitiveness of the vehicle headlight 200.

[0038] The specific implementation manners of each module in the light source device 100 will be described below.

[0039] In this embodiment, the excitation light module 10 is used to generate the excitation light E. Here, the excitation light E may be a laser. For example, the excitation light E may be a blue laser (for example, the central wavelength may be 480 nm), a deep blue laser (for example, the central wavelength may be 460 nm), and so on. Of course, the excitation light E may also be LED light (for example, blue LED light); the excitation light E may also be a mixed light of laser and LED light. This embodiment does not make specific limitations on this.

[0040] In some possible embodiments, the excitation light E may be a laser, and the excitation light module 10 may include a laser generator 120 and a collimating lens group 140, where the laser generator 120 is used to generate the excitation light E. Specifically, the laser generator 120 may be an edge-emitting laser (EEL), a vertical-cavity surface-emitting laser (VCSEL), and so on.

[0041] The collimating lens group 140 is disposed on the optical path where the excitation light E is located, and is used to collimate the excitation light E to improve the energy utilization efficiency of the excitation light E. In addition, the collimating lens group 140 is also used to shape the spot shape of the excitation light E so that the size of the shaped spot can match the size of the phosphor sheet 320. Here, "size matching" means that the size of the shaped spot is smaller than the size of the phosphor sheet 320, so that the spot of the excitation light E can be completely located within the area where the phosphor sheet 320 is located, ensuring the excitation efficiency of the fluorescence F. Exemplarily, the spot shape of the excitation light E shaped by the collimating lens group 140 can be circular, elliptical, etc.

[0042] Specifically, the collimating lens group 140 may include one or more collimating lenses 1410. Among them, the collimating lens 1410 may be a convex lens or a concave lens; the collimating lens 1410 may be a spherical lens or an aspherical lens. The number and specific shape of the collimating lens 1410 are not limited in this embodiment. Figure 2 In the illustrated embodiment, the number of the collimating lenses 1410 is two. In other embodiments, the number of the collimating lenses 1410 may be one, three, four, etc.

[0043] In some possible embodiments, when the laser generator 120 is an edge-emitting laser, the collimating lens group 140 may include a fast-axis collimating lens (Fast Axis Collimator Lens, FAC) and a slow-axis collimating lens (Slow Axis Collimator Lens, SAC). The fast-axis collimating lens and the slow-axis collimating lens are sequentially arranged on the optical path where the excitation light E is located, and respectively collimate the excitation light E.

[0044] In some other possible embodiments, the excitation light E may be LED light, and the excitation light module 10 may include a plurality of LED beads arranged in an array. The plurality of LED beads are used to jointly generate the excitation light E. Specifically, the LED beads may be blue LED beads, and the plurality of blue LED beads may be arranged in an M*N array or a ring array.

[0045] In this embodiment, the fluorescence module 30 is disposed on the optical path where the excitation light E is located, and is used to generate fluorescence F under the excitation of the excitation light E. The fluorescence module 30 may include a phosphor sheet 320 and a substrate 340. The phosphor sheet 320 is disposed on the side of the substrate 340 facing the lens module 50. The substrate 340 is used to support and fix the phosphor sheet 320 and play a role in heat dissipation to improve the service life of the light source device 100. Specifically, the substrate 340 may be made of a material with a high thermal conductivity coefficient (for example, aluminum alloy, carbon fiber, ceramic particles, etc.) to improve the heat dissipation efficiency of the phosphor sheet 320.

[0046] In some possible embodiments, a heat dissipation member (not shown in the figure) may be further disposed on the side of the substrate 340 facing away from the phosphor sheet 320, which is used to dissipate the heat generated when the excitation light E irradiates on the surface of the phosphor sheet 320, so as to avoid local overheating of the phosphor sheet 320 and ensure the service life of the phosphor sheet 320.

[0047] As an implementation manner, the heat dissipation member may be a heat sink, and the heat sink may be a heat sink made of a material with high thermal conductivity (for example, metal or an alloy with a relatively high thermal conductivity). Specifically, the heat sink may be generally in a fin shape to increase the heat dissipation area and improve the heat dissipation efficiency. As another implementation manner, the heat dissipation member may be a liquid cooling plate, and the liquid cooling plate may be provided with a liquid cooling channel, and the heat at the phosphor sheet 320 is taken away by the coolant continuously circulating in the liquid cooling channel to achieve the heat dissipation effect on the phosphor sheet 320.

[0048] The phosphor sheet 320 is disposed on the optical path where the excitation light E is located, and is used to generate fluorescence F under the excitation of the excitation light E. Among them, the fluorescence F may be yellow fluorescence or red-green mixed fluorescence. As an implementation manner, the phosphor sheet 320 may be a fluorescent ceramic sheet, and a large number of fluorescent particles (for example, yellow fluorescent particles, red-green fluorescent mixed particles, etc.) may be doped in the fluorescent ceramic sheet. Specifically, the phosphor sheet 320 may be attached to the side of the substrate 340 facing the lens module 50, or the phosphor sheet 320 may be embedded in the side of the substrate 340 facing the lens module 50 to improve the connection reliability between the phosphor sheet 320 and the substrate 340.

[0049] In Figure 2 the illustrated embodiment, the light-emitting surface of the phosphor sheet 320 ( Figure 2 not marked in the figure) may be disposed perpendicular to the optical axis O of the lens module 50 to maximize the collection efficiency of the lens module 50 for the fluorescence F.

[0050] Please refer to Figure 3 and Figure 4 , the light-emitting surface 3201 of the phosphor sheet 320 is inclined towards the side where the scanning mirror 720 is located, so that the included angle between the light-emitting surface 3201 of the phosphor sheet 320 and the optical axis O of the lens module 50 is an acute angle. Specifically, the light-emitting surface 3201 of the phosphor sheet 320 may be disposed opposite to the reflecting surface of the scanning mirror 720. For example, the two may be substantially parallel, or the two form a certain included angle. Here, the "light-emitting surface 3201" may be understood as the plane on the side of the phosphor sheet 320 facing away from the substrate 340, and the fluorescence F is emitted to the lens module 50 through this plane. Since the light-emitting surface 3201 is inclined towards the scanning mirror 720, compared with Figure 2The setting method of the phosphor sheet 320 can increase the incident angle of the excitation light E incident on the light-emitting surface 3201, thereby improving the conversion efficiency of the excitation light E into the fluorescence F, and further improving the overall brightness of the fluorescence F. Here, the "incident angle" refers to the included angle between the optical axis direction of the excitation light E emitted by the lens module 50 and the light-emitting surface 3201.

[0051] In some possible embodiments, the included angle between the light-emitting surface 3201 of the phosphor sheet 320 and the optical axis O of the lens module 50 is a first included angle A1, and the angular value of the first included angle A1 is greater than or equal to 60 degrees and less than 90 degrees. For example, the first angle A1 can be 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, 85 degrees, etc. Since the lower limit of the angular value of the first included angle A1 in this embodiment is 60 degrees, it is possible to avoid the situation where part of the fluorescence F cannot be smoothly incident on the lens module 50 due to the excessive inclination angle of the phosphor sheet 320, thereby ensuring the smooth operation of the light source device 100.

[0052] In some possible embodiments, the included angle between the optical axis direction of the excitation light E incident on the phosphor sheet 320 and the light-emitting surface 3201 of the phosphor sheet 320 is a second included angle A2, and the angular value of the second included angle A2 is greater than 15 degrees. For example, the second included angle A2 can be 20 degrees, 25 degrees, 30 degrees, 35 degrees, etc. Since the angular value of the second included angle A2 is greater than 15 degrees, the conversion efficiency of the excitation light E into the fluorescence F can be improved, and further the overall brightness of the fluorescence F can be improved. Further, the angular value of the second included angle is less than or equal to 45 degrees, which can avoid the situation where part of the fluorescence F cannot be smoothly incident on the lens module 50 due to the excessive inclination angle of the phosphor sheet 320, thereby ensuring the smooth operation of the light source device 100.

[0053] Please refer to Figure 5 ., the excitation light E can include a first sub-excitation light E1 and a second sub-excitation light E2, and the phosphor sheet 320 generates fluorescence F under the excitation of the first sub-excitation light E1. The fluorescence module 30 may further include a reflective film 360, and the reflective film 360 is disposed on the side of the phosphor sheet 320 away from the lens module 50. The reflective film 360 may be disposed between the phosphor sheet 320 and the substrate 340, and is used to reflect the second sub-excitation light E2 and part of the fluorescence F, so that the second sub-excitation light E2 and the fluorescence F are combined and then incident on the lens module 50. Specifically, when the excitation light E is blue light and the fluorescence F is yellow fluorescence, the second sub-excitation light E2 and the fluorescence F will be mixed to form white light incident on the lens module 50. The light formed by the mixture of the second sub-excitation light E2 and the fluorescence F here can be regarded as the "specified light beam L" in the above text.

[0054] It is not difficult to understand here that the "first sub-excitation light" and "second sub-excitation light" in this embodiment are only named for the convenience of describing the optical path. Specifically, the part of the excitation light E that is excited by the phosphor sheet 320 and converted into fluorescence F is called the "first sub-excitation light", and the other part of the excitation light E that is not excited by the phosphor sheet 320 but is reflected by the reflection film 360 is called the "second sub-excitation light".

[0055] Therefore, in this embodiment, by providing the reflection film 360, part of the excitation light E that is not excited by the phosphor sheet 320 can be reflected, so as to improve the energy utilization efficiency of the excitation light E. In addition, since the fluorescence F generated by being excited by the phosphor sheet 320 is spherical light, that is to say, there will be a part of the fluorescence F that exits toward the side of the reflection film 360. The reflection film 360 can also reflect this part of the fluorescence F to the lens module 50, so as to improve the energy utilization efficiency of the fluorescence F.

[0056] It is not difficult to find here that the fluorescence module 30 in this embodiment adopts a reflective fluorescence excitation scheme. On the one hand, the overall heat dissipation efficiency of the fluorescence module 30 can be improved; on the other hand, the incident angle of the excitation light E incident on the phosphor sheet 320 (that is, the second angle A2) is small, which can ensure the excitation efficiency and collection efficiency of the fluorescence F.

[0057] In this embodiment, the lens module 50 is disposed on the optical paths of both the excitation light E and the fluorescence F. On the one hand, the lens module 50 is used to deflect the excitation light E to the surface of the phosphor sheet 320, so that the phosphor sheet 320 can be smoothly excited to generate fluorescence F under the action of the excitation light E. On the other hand, the lens module 50 is also used to converge the fluorescence F, so as to improve the energy utilization efficiency of the fluorescence F. Therefore, in this embodiment, by reusing the lens module 50, the overall optical path of the light source device 100 can be made more compact and reasonable.

[0058] Please refer to again Figure 2 and Figure 3 , the lens module 50 may include a first lens 520 and a second lens 540. The first lens 520 and the second lens 540 are sequentially disposed on the optical path of the fluorescence F to improve the collection and utilization efficiency of the fluorescence F. Specifically, the first lens 520 and the second lens 540 may be convex lenses respectively, for example, biconvex lenses, plano-convex lenses, etc. The specific implementation manners of the first lens 520 and the second lens 540 are not limited in this embodiment.

[0059] In this embodiment, the first lens 520 is also disposed on the optical path where the excitation light E is located, and is used to deflect the excitation light E to the phosphor sheet 320. The "deflection" here can be understood as the process of the first lens 520 refracting the excitation light E twice. Specifically, the incident surface 5201 of the first lens 520 and the outgoing surface 3201 of the phosphor sheet 320 are relatively spaced apart, so as to make the optical path between the fluorescence module 30 and the lens module 50 more compact. In some possible embodiments, the incident surface 5201 of the first lens 520 can be a flat surface.

[0060] As an implementation manner, the distance between the incident surface 5201 of the first lens 520 and the outgoing surface 3201 of the phosphor sheet 320 can be less than or equal to 1 cm, so as to ensure that the fluorescence F emitted from the outgoing surface 3201 of the phosphor sheet 320 can almost entirely enter the first lens 520, thereby ensuring the utilization efficiency of the fluorescence F. The "distance" here can be understood as the minimum distance between the two in the optical axis direction of the first lens 520. Specifically, the above distance can be 0.5 cm, 0.7 cm, 0.9 cm, etc. In addition, since the distance between the first lens 520 and the phosphor sheet 320 is small, the excitation light E emitted after being deflected by the first lens 520 can enter the phosphor sheet 320 at a relatively small incident angle (i.e., the second angle A2), so as to ensure the excitation efficiency of the fluorescence F.

[0061] In Figure 2 and Figure 3 In the illustrated embodiment, the second lens 540 may include an incident surface 5401, an avoidance surface 5403, and an outgoing surface 5405. Among them, the fluorescence F enters the second lens 540 through the incident surface 5401 and exits through the outgoing surface 5405. In some possible embodiments, the incident surface 5401 of the second lens 540 can be a flat surface, and the outgoing surface 5405 of the second lens 540 can be a convex curved surface.

[0062] The avoidance surface 5403 of the second lens 540 is located between the incident surface 5401 of the second lens 540 and the outgoing surface 5405 of the second lens 540. The avoidance surface 5403 of the second lens 540 is spaced apart from the scanning mirror 720, so that the second lens 540 is not located on the optical path where the excitation light E is located. Specifically, the side of the second lens 540 facing the scanning mirror 720 can be "trimmed" to form the avoidance surface 5403. In some possible embodiments, the avoidance surface 5403 can be a flat surface, and the avoidance surface 5403 can be perpendicular to the incident surface 5401. In some other possible embodiments, the avoidance surface 5403 can also be a curved surface. The specific shape of the avoidance surface 5403 is not limited in this embodiment.

[0063] Therefore, in this embodiment, by trimming the second lens 540 so that the second lens 540 is not on the optical path where the excitation light E is located, the occurrence of optical path interference can be avoided, ensuring the light output effect of the light source device 100. In addition, by spacing the avoidance surface 5403 from the scanning mirror 720, the overall structure of the light source device 100 can be made more compact, which is conducive to realizing the miniaturized design of the lamp 200.

[0064] It is not difficult to find here that since the scanning mirror 720 is disposed on one side of the avoidance surface 5403, when the fluorescence F exits through the light exit surface 5405, the situation where the scanning mirror 720 blocks part of the fluorescence F will not occur, so as to ensure the energy utilization efficiency of the fluorescence F.

[0065] Please refer to Figure 6 and Figure 7 , the second lens 540 may include a light exit surface 5405, and the fluorescence F exits through the light exit surface 5405. In this embodiment, the second lens 540 is not "trimmed", and the complete structure of the second lens 540 is retained, which can reduce the processing cost of the second lens 540.

[0066] Specifically, the scanning mirror 720 is spaced from the light exit surface 5405 of the second lens 540 so that the excitation light E enters the second lens 540 through the light exit surface 5405, and the second lens 540 is further configured to deflect the excitation light E to the first lens 520. The "deflection" here can be understood as the process of the second lens 540 refracting the excitation light E twice. Therefore, in this embodiment, the scanning mirror 720 is disposed on one side of the light exit surface 5405, so that the excitation light E and the fluorescence F can simultaneously reuse the first lens 520 and the second lens 540, making the overall optical path of the light source device 100 more compact and reasonable.

[0067] In Figure 6 the embodiment shown, the optical axis direction of the excitation light E generated at the laser generator 120 is parallel to the optical axis O of the lens module 50. The guiding module 70 may further include a reflecting mirror 760, and the reflecting mirror 760 is disposed on the optical path of the excitation light E exiting through the scanning mirror 720, and is configured to reflect the excitation light E to the light exit surface 5405 of the second lens 540, so as to play a role in folding the optical path, making the overall optical path of the light source device 100 more compact and reasonable.

[0068] Of course, Figure 6 the reflecting mirror 760 and the scanning mirror 720 in

[0069] InFigure 7 In the illustrated embodiment, the optical axis direction of the excitation light E generated at the laser generator 120 is perpendicular to the optical axis O of the lens module 50. In this case, the scanning mirror 720 directly reflects the excitation light E generated at the laser generator 120 to the light-emitting surface 5405 of the second lens 540. Therefore, in this embodiment, there is no need to provide a reflecting mirror 760, which can reduce the hardware cost of the light source device 100.

[0070] In this embodiment, the scanning mirror 720 is rotatably disposed on the optical path where the excitation light E is located, and is used to reflect the excitation light E to the lens module 50. Among them, the scanning mirror 720 can be rotated under the control of the controller 740 to adjust the position of the light spot formed by the excitation light E on the phosphor sheet 320, and thus can adjust the exit position of the fluorescence F from the lens module 50. Specifically, the scanning mirror 720 can be an electric scanning mirror, a scanning galvanometer, etc. The controller 740 can be a Microcontroller Unit (MCU), or a control circuit integrated with a control chip, etc. This embodiment does not limit the specific implementation manners of the scanning mirror 720 and the controller 740.

[0071] The scanning method of the scanning mirror 720 will be described below in combination with the shape of the phosphor sheet 320.

[0072] Please refer to Figure 8 and Figure 9 , the phosphor sheet 320 is generally rectangular, and it can have a first direction X and a second direction Y. The length of the phosphor sheet 320 in the first direction X is greater than the length of the phosphor sheet 320 in the second direction Y, and the first direction X and the second direction Y intersect. Specifically, the first direction X can be the length direction of the phosphor sheet 320, the second direction Y can be the width direction of the phosphor sheet 320, and the first direction X can be perpendicular to the second direction Y.

[0073] In this embodiment, the ratio between the length of the light spot K in the first direction X and the length of the phosphor sheet 320 in the first direction X is less than or equal to 0.15. Here, the "light spot K" refers to the light spot formed after the excitation light E is collimated by the collimating lens group 140. Exemplarily, the "ratio" here can be 0.01, 0.05, 0.1, 0.15, etc. Since the ratio between the length of the light spot K in the first direction X and the length of the phosphor sheet 320 in the first direction X is less than or equal to 0.15, it means that the light spot K has a "moving space" in the first direction X. Therefore, the controller 740 can be used to control the rotation of the scanning mirror 720 so that the light spot K moves along the first direction X on the phosphor sheet 320.

[0074] On the one hand, since the position of the light spot K is constantly changing, the exit position of the fluorescence F from the lens module 50 can be adjusted, thereby realizing the adaptive lighting function of the vehicle lamp 200. On the other hand, since the position of the light spot K is constantly changing, the situation where the excitation light E irradiates the same area of the phosphor sheet 320 for a long time and causes overheating can be avoided, ensuring the service life of the phosphor sheet 320.

[0075] In Figure 8 the illustrated embodiment, the light spot K after being collimated by the collimating lens group 140 of the excitation light E is generally elliptical. Among them, the long axis direction of the elliptical light spot can be the second direction Y, and the short axis direction of the elliptical light spot can be the first direction X. Specifically, the ratio between the length of the light spot K in the second direction Y and the length of the phosphor sheet 320 in the second direction Y is greater than or equal to 0.95. Exemplarily, the "ratio" here can be 0.95, 0.97, 0.99, etc. That is to say, the light spot K substantially coincides with the phosphor sheet 320 in the second direction Y.

[0076] In this case, as Figure 9 shown, the controller 740 only needs to control the scanning mirror 720 to perform one-dimensional scanning so that the light spot K moves back and forth on the phosphor sheet 320 along the first direction X, and the irradiation of the entire area of the phosphor sheet 320 by the excitation light E can be realized, so as to improve the utilization efficiency of the phosphor sheet 320. Since the scanning mirror 720 only needs to perform one-dimensional scanning, the hardware cost of the scanning mirror 720 can be reduced. For example, the scanning mirror 720 in this embodiment can be an electric one-dimensional scanning mirror. In addition, the control strategy of the controller 740 for the scanning mirror 720 is simpler, and the computing resources of the controller 740 can be saved.

[0077] Please refer to Figure 10 , the light spot K after being collimated by the collimating lens group 140 of the excitation light E is generally circular. Among them, the ratio between the length of the light spot K in the second direction Y and the length of the phosphor sheet 320 in the second direction Y is less than or equal to 0.15. Exemplarily, the "ratio" here can be 0.01, 0.05, 0.1, 0.15, etc. Since the ratio between the length of the light spot K in the second direction Y and the length of the phosphor sheet 320 in the second direction Y is less than or equal to 0.15, it means that the light spot K also has a "moving space" in the second direction Y. Therefore, the controller 740 can be used to control the rotation of the scanning mirror 720 so that the light spot K can move along the first direction X and the second direction Y on the phosphor sheet 320 respectively.

[0078] Specifically, the controller 740 can control the scanning mirror 720 to perform two-dimensional scanning so that the light spot K moves on the phosphor sheet 320 along the first direction X and the second direction Y, thereby realizing the irradiation of the entire area of the phosphor sheet 320 by the excitation light E and improving the utilization efficiency of the phosphor sheet 320. Exemplarily, the movement trajectory of the light spot K on the phosphor sheet 320 can be roughly zigzag. In this embodiment, the scanning mirror 720 can be an electric two-dimensional scanning mirror.

[0079] It is not difficult to understand here that the fluorescence F emitted from different positions of the phosphor sheet 320 can achieve illumination at different angles after passing through the lens module 50. That is to say, the illumination position of the excitation light E on the phosphor sheet 320 and the emission angle of the fluorescence F are in one-to-one correspondence. Therefore, when the scanning mirror 720 performs two-dimensional scanning, compared with one-dimensional scanning, the excitation light E can pass through more regional positions, which is beneficial to improving the adaptive illumination effect of the vehicle headlamp 200.

[0080] Furthermore, when it is necessary to turn off the illumination light in a specific direction in front of the vehicle headlamp 200 or reduce the brightness of the illumination light, the controller 740 only needs to turn off the excitation light E or reduce the power of the illumination light E when the excitation light E scans to the corresponding position of the phosphor sheet 320, thereby realizing the adaptive illumination function of the vehicle headlamp 200 and making the illumination of the vehicle headlamp 200 more intelligent.

[0081] This embodiment provides a light source device 100 and a vehicle headlamp 200 configured with the light source device 100. The light source device 100 may include an excitation light module 10, a fluorescence module 30, a lens module 50, and a guiding module 70. Among them, the excitation light module 10 is used to generate the excitation light E. The fluorescence module 30 may include a phosphor sheet 320, and the phosphor sheet 320 is disposed on the optical path where the excitation light E is located and is used to generate fluorescence F under the excitation of the excitation light E. The lens module 50 is disposed on the optical paths of the excitation light E and the fluorescence F, and is used to deflect the excitation light E so that the deflected excitation light E is incident on the phosphor sheet 320. The lens module 50 is also used to converge the fluorescence F. The guiding module 70 may include a scanning mirror 720 and a controller 740. The scanning mirror 720 is rotatably disposed on the optical path where the excitation light E is located and is used to reflect the excitation light E to the lens module 50. The controller 740 is electrically connected to the scanning mirror 720 and is used to control the rotation of the scanning mirror 720 so that the position of the light spot formed by the excitation light E on the phosphor sheet 320 continuously changes.

[0082] Since the scanning mirror 720 rotates under the control of the controller 740 to adjust the position of the light spot formed by the excitation light E on the phosphor sheet 320, the emission position of the fluorescence F from the lens module 50 can be adjusted accordingly. When the light source device 100 is used in the vehicle headlight 200, the adaptive lighting function of the vehicle headlight 200 can be realized. Therefore, in this embodiment, the architecture of the adaptive high beam is realized by using the excitation light to excite the fluorescence. Compared with the DLP scheme that requires the use of DMD in the prior art, this embodiment does not need to set up DMD, and the hardware cost is lower.

[0083] In addition, the lens module 50 in this embodiment is disposed on the optical paths of both the excitation light E and the fluorescence F. On the one hand, the lens module 50 is used to deflect the excitation light E to the surface of the phosphor sheet 320, so that the phosphor sheet 320 can smoothly excite the fluorescence F under the action of the excitation light E. On the other hand, the lens module 50 is also used to converge the fluorescence F to improve the energy utilization efficiency of the fluorescence F. Therefore, by reusing the lens module 50 in this embodiment, the overall optical path of the light source device 100 can be made more compact and reasonable, which is beneficial to the miniaturization design of the vehicle headlight 200 equipped with the light source device 100, and thus improves the market competitiveness of the vehicle headlight 200.

[0084] In the description of the present application, certain terms are used to refer to specific components in the specification and claims. 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 the difference in names as a way to distinguish components, but use the difference in functions of components as the criterion for distinction. As mentioned throughout the specification and claims, "including" is an open-ended term and should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0085] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inside", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0086] In this application, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection, or indirectly connected through an intermediate medium, or the communication inside two components, or just surface contact. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0087] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do 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, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0088] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and 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 various embodiments of this application.

Claims

1. A light source device, characterized in that, Comprising: An excitation light module for generating excitation light; A fluorescence module including a phosphor sheet, the phosphor sheet being disposed on the optical path where the excitation light is located and being used for generating fluorescence under the excitation of the excitation light; A lens module disposed on the optical paths where the excitation light and the fluorescence are located, for deflecting the excitation light so that the deflected excitation light is incident on the phosphor sheet; the lens module is further used for converging the fluorescence; And A guiding module including a scanning mirror and a controller, the scanning mirror being rotatably disposed on the optical path where the excitation light is located and being used for reflecting the excitation light to the lens module; The controller is electrically connected to the scanning mirror and is used for controlling the rotation of the scanning mirror so that the position of the light spot formed by the excitation light on the phosphor sheet changes continuously.

2. The light source device according to claim 1, characterized in that, The light-emitting surface of the phosphor sheet is inclined towards the side where the scanning mirror is located, so that the included angle between the light-emitting surface of the phosphor sheet and the optical axis of the lens module is an acute angle.

3. The light source device according to claim 2, wherein The included angle between the light-emitting surface of the phosphor sheet and the optical axis of the lens module is a first included angle, and the angular value of the first included angle is greater than or equal to 60 degrees and less than 90 degrees.

4. The light source device according to claim 2, wherein The included angle between the optical axis direction of the excitation light incident on the phosphor sheet and the light-emitting surface of the phosphor sheet is a second included angle, and the angular value of the second included angle is greater than 15 degrees; the angular value of the second included angle is less than or equal to 45 degrees.

5. The light source device according to any one of claims 1 to 4, characterized in that The lens module includes a first lens and a second lens, and the first lens and the second lens are sequentially disposed on the optical path where the fluorescence is located; The first lens is further disposed on the optical path where the excitation light is located and is used for deflecting the excitation light to the phosphor sheet.

6. The light source device according to claim 5, characterized in that, The second lens includes an incident light surface, an avoidance surface and an exit light surface, and the fluorescence enters the second lens through the incident light surface and exits through the exit light surface; The avoidance surface of the second lens is located between the incident light surface of the second lens and the exit light surface of the second lens, and the avoidance surface of the second lens is spaced from the scanning mirror so that the second lens is not located on the optical path where the excitation light is located.

7. The light source device according to claim 5, wherein The second lens includes an exit light surface, and the fluorescence exits through the exit light surface; The scanning mirror is spaced from the exit light surface so that the excitation light enters the second lens through the exit light surface, and the second lens is further used for deflecting the excitation light to the first lens.

8. The light source device according to any one of claims 1 to 4, characterized in that, The excitation light includes a first sub-excitation light and a second sub-excitation light, and the phosphor sheet generates the fluorescence under the excitation of the first sub-excitation light; The fluorescence module further includes a reflection film, and the reflection film is disposed on the side of the phosphor sheet facing away from the lens module and is used for reflecting the second sub-excitation light and part of the fluorescence so that the second sub-excitation light and the fluorescence are combined and then incident on the lens module.

9. The light source device according to any one of claims 1 to 4, characterized in that, The phosphor sheet has a first direction and a second direction, the length of the phosphor sheet in the first direction is greater than the length of the phosphor sheet in the second direction, and the first direction and the second direction intersect; The ratio between the length of the light spot in the first direction and the length of the phosphor sheet in the first direction is less than or equal to 0.15; the ratio between the length of the light spot in the second direction and the length of the phosphor sheet in the second direction is greater than or equal to 0.95; The controller is configured to control the rotation of the scanning mirror so that the light spot moves along the first direction on the phosphor sheet.

10. The light source device according to any one of claims 1 to 4, characterized in that, The phosphor sheet has a first direction and a second direction, the length of the phosphor sheet in the first direction is greater than the length of the phosphor sheet in the second direction, and the first direction and the second direction intersect; The ratio between the length of the light spot in the first direction and the length of the phosphor sheet in the first direction is less than or equal to 0.15; the ratio between the length of the light spot in the second direction and the length of the phosphor sheet in the second direction is less than or equal to 0.15; The controller is configured to control the rotation of the scanning mirror so that the light spot can move along the first direction and the second direction respectively on the phosphor sheet.

11. A vehicle lamp, characterized in that, Comprising: The light source device according to any one of claims 1 to 10.

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