CN110792985B

CN110792985B - Light source device and headlamp system

Info

Publication number: CN110792985B
Application number: CN201910553068.5A
Authority: CN
Inventors: 张贤鹏; 常静; 李屹
Original assignee: YLX Inc
Current assignee: YLX Inc
Priority date: 2018-08-01
Filing date: 2019-06-25
Publication date: 2022-10-11
Anticipated expiration: 2039-06-25
Also published as: WO2020024595A1; CN110792985A

Abstract

The invention protects a light source device, which comprises a first light source module, a second light source module, an imaging lens group, a micro reflector and a substrate; the imaging lens group at least comprises a first lens and a second lens, and the micro mirror is arranged between the first lens and the second lens; the first light source module comprises a laser light source and a wavelength conversion element which are arranged separately, the laser light source emits exciting light, the exciting light is reflected by the micro-reflector and then enters the wavelength conversion element through the first lens, the wavelength conversion element absorbs at least part of the exciting light and emits excited light towards the first lens, and the wavelength conversion element is arranged on an optical axis of the imaging lens group; the second light source module comprises an LED array arranged on the substrate, is arranged on the same side of the first lens with the wavelength conversion element and deviates from the optical axis of the imaging lens group, and the imaging lens group is used for projecting light emitted by the second light source module and the wavelength conversion element to a far field for imaging. Through the imaging system, controllable emergent light distribution is realized.

Description

Light source device and headlamp system

Technical Field

The invention relates to the technical field of illumination, in particular to a light source device and a headlamp system.

Background

Since the invention of blue light LED, semiconductor light source gradually replaces traditional light source by virtue of higher and higher luminous brightness and luminous efficiency, environmental protection characteristic of material and luminous characteristic of cold light source, and is applied to various fields of illumination. With the increasing demand for brightness, semiconductor light sources are expected to be highly desirable. The existing LED lighting is gradually improved towards the direction of high power and combination of a plurality of light-emitting elements. However, due to the characteristics of LEDs themselves, heat dissipation increasingly hinders the improvement of illumination brightness. Although the total luminous flux can be improved by using a plurality of LED light-emitting chips, the volume of the whole light source is increased, the optical power density of emergent light is not high, and high-illumination lighting spots in a small area are difficult to realize.

The laser diode belonging to the solid-state light source has the advantages of high luminous brightness under large current, long irradiation distance and the like, and the white light is obtained by exciting the fluorescent powder through the laser diode. The technical scheme that the laser light source and the fluorescent luminescent material generate heat and are separated from each other by the technical personnel in the field is to further improve the brightness of the whole light source, so that the technical scheme becomes an industry-approved technical scheme, and more research and development personnel try to apply the technical scheme of remotely exciting the fluorescent luminescent material by the laser to the high-brightness illumination field.

In the field of vehicle lamp illumination, the technical scheme that a light source is combined with a reflecting cup is generally adopted to realize regional illumination, a fluorescent luminescent material is arranged at the focal position of the reflecting cup, the fluorescent luminescent material is excited to generate fluorescence remotely, and then the fluorescence is collected by the reflecting cup and then emitted to form a vehicle lamp illumination beam. The technical scheme inherits the traditional filament bulb lighting scheme (such as a halogen lamp or a gas discharge lamp) to simulate a filament by using a fluorescent luminescent material, and the LED car lamp which is popular nowadays also adopts a similar scheme to place an LED lamp bead at the focus position of a reflecting cup. However, in this solution, the light emitted from the fluorescent light-emitting material is similar to that of an LED or a filament lamp, and is approximately lambertian distributed light (i.e. light with uniform directions), and is collected by the reflective cup and then emitted, so that either parallel light with uniform surface distribution or point light source with uniform angular distribution is formed, and the light will irradiate the whole illumination area rather than be concentrated in the central illumination area, and thus a high illumination area at the far-light center required for lighting the vehicle lamp cannot be really formed. Even if emergent light generated by the technical scheme of remotely exciting the fluorescent light-emitting material by laser is non-isotropic light between Gaussian distribution and Lambert distribution, the angular distribution of the emergent light is uncontrollable, so that the size of a far-field high-illumination area is uncontrollable, and the illumination light spots do not reach the standard.

Moreover, in the technical scheme of the reflection cup, once the fluorescent luminescent material falls off, laser light is directly emitted, so that the problem of light safety is easily caused.

Disclosure of Invention

Aiming at the defect that the prior art can not form controllable illumination spots with non-uniformly distributed illumination intensity, the invention provides a novel light source device with a high-illumination-intensity area, which comprises a first light source module, a second light source module, an imaging lens group, a micro-reflector and a substrate; the imaging lens group at least comprises a first lens and a second lens, and the micro mirror is arranged between the first lens and the second lens; the first light source module comprises a laser light source and a wavelength conversion element which are arranged separately, the laser light source is used for emitting exciting light, the exciting light is reflected by a micro-reflector and then enters the wavelength conversion element through the first lens, the wavelength conversion element absorbs at least part of the exciting light and emits stimulated light with wavelength different from the exciting light towards the first lens, and the wavelength conversion element is arranged on an optical axis of the imaging lens group; the second light source module comprises an LED array arranged on the substrate, the LED array and the wavelength conversion element are arranged on the same side of the first lens and are arranged by deviating from the optical axis of the imaging lens group, and the imaging lens group is used for projecting light emitted by the second light source module and the wavelength conversion element to a far field for imaging.

Compared with the prior art, the invention has the following beneficial effects: the emergent light of the second light source module and the wavelength conversion element is collected through the imaging lens group and then projected, light distribution can be formed in a preset far field in an imaging mode, the wavelength conversion element arranged on the optical axis is excited by laser, high-brightness emergent light can be emitted, a high-illumination light spot is formed at a far center position after projection imaging, and an LED array arranged by deviating from the optical axis is imaged around the high-illumination light spot to form a low-illumination light spot area. Since the light path process is an imaging process, the arrangement distribution and the area relationship between the initial second light source module and the wavelength conversion element determine the final light distribution result, and the light distribution result obtained at the preset position is controllable.

In one embodiment, the first light source module further includes an auxiliary LED disposed on a side of the wavelength conversion element away from the first lens, and the auxiliary LED is disposed on an optical axis of the imaging lens group. According to the technical scheme, the wavelength conversion element can have incident light on the front side and the rear side, and even under the condition that a laser light source is not started, the light of the auxiliary LED can be emitted, so that dark spots of the optical axis position of the imaging lens group are avoided.

In one embodiment, the LED array is a white LED array, the auxiliary LED is a blue LED, the excited light is a combination of red light and green light or yellow light, and a projection of the wavelength conversion element on a plane where the LED array is located does not coincide with the LED array. The technical scheme ensures that the first light source module and the second light source module emit white light, and ensures that the colors of the emitted light are uniform. Furthermore, the proportion of the blue light emitted by the auxiliary LED and the laser light emitted by the wavelength conversion element can be changed by independently controlling the size of the circuit of the auxiliary LED, so that the color adjustment is consistent.

In one embodiment, the substrate includes a groove, the auxiliary LEDs are disposed in the groove, the LED array is disposed in the non-groove portion of the substrate, and the light-emitting surface of the wavelength conversion element and the light-emitting surface of the LED array are on the same plane. In the technical scheme, the auxiliary LED is arranged in the groove of the substrate, so that a sufficient distance is provided from the light-emitting surface of the auxiliary LED to the plane where the light-emitting surface of the LED array is located to accommodate the wavelength conversion element with a sufficient thickness, on one hand, the wavelength conversion element can emit laser light with sufficient brightness, and on the other hand, the wavelength conversion element and the LED array emit light in a coplanar manner, so that the imaging quality of the wavelength conversion element and the LED array is consistent, and the light distribution is controllable.

Furthermore, the light emitting surface of the wavelength conversion element and the light emitting surface of the LED array are positioned on the same focal plane of the imaging lens group, and the position is favorable for optimal distribution of the emergent light beams.

In one embodiment, the LED array is a blue LED array, the auxiliary LED is a blue LED, the excited light is a combination of red light and green light or yellow light, and a projection of the wavelength conversion element on a plane where the LED array is located covers the LED array.

In one embodiment, the device further comprises a controller, the controller independently controls the switches of the laser light source and the auxiliary LED, and when the light source device is in a working state and the laser light source is in a closed or fault state, the controller controls the auxiliary LED to be switched on. The technical scheme avoids the condition that the distribution center of the emergent light of the light source device is a dark spot under the condition that the laser light source does not work.

In one embodiment, the wavelength conversion element is disposed on the substrate, and a light emitting surface of the wavelength conversion element and a light emitting surface of the LED array are on the same plane.

In one embodiment, the optical device includes a beam splitter disposed on a light emitting surface of the wavelength conversion element, and the beam splitter reflects the received laser light with an incident angle larger than a predetermined angle. Due to the limitation of the size of the lens, the imaging lens group cannot collect all the light emitted by 180 degrees, and light loss is inevitably caused. The light splitting sheet may be a sheet or a film layer, and the present invention is not limited thereto.

Further specifically, the spectroscope reflects light having an incident angle of more than 60 ° and transmits other light.

In one embodiment, the LED display device further comprises a diffusion sheet located between the LED array and the first lens, the diffusion sheet and the LED array are arranged at intervals, and the projection of the diffusion sheet on the plane where the LED array is located covers the LED array. Because seamless connection is impossible between all LEDs of the LED array, dark fringes can be caused after imaging, in the technical scheme, the diffusion sheet which is spaced from the LED array is arranged between the LED array and the first lens, so that light emitted by the LED array forms a light spot array without dark seams on the diffusion sheet, namely the diffusion sheet becomes a new 'object light source', and then the imaging lens group projects the 'object light source' to a far field for imaging, so that light distribution without dark fringes is obtained remotely.

In one embodiment, the diffusion sheet is located at the focal plane of the imaging lens group, so that the light spot distribution of the diffusion sheet is optimally imaged in a far field, and the imaging quality and the control of the light distribution area are improved.

In one embodiment, the light source device further includes a light shielding sheet movably disposed between the wavelength conversion element and the first lens, and when the light shielding sheet is located at a first position, the light shielding sheet shields a portion of light emitted from the wavelength conversion element, so that the light source device forms a first distribution of light; when the light shielding sheet is located at the second position, emergent light of the wavelength conversion element is not shielded, so that the light source device forms light with second distribution.

In one embodiment, the light source device includes the diffusion sheet and the light-shielding sheet, and the diffusion sheet and the light-shielding sheet are disposed in close proximity to each other and both are located near a focal plane of the imaging lens group, so that the area distribution of emergent light is controllable, and the light-shielding sheet has a clear profile, which is beneficial to the quality consistency of the light source device after industrialization.

In one embodiment, the micro-mirror is a reflecting prism adhered on the light incident surface of the second lens. The structure is simple and easy to process, on one hand, the micro-reflector is fixed, and an additional fixing structure is not needed; on the other hand, the process complexity of the scheme of integrally molding the micro-reflector and the second lens is avoided.

The invention also claims a headlamp system comprising the light source device. The light distribution obtained by the headlamp system is controllable in area distribution, so that the area of a high-illumination area can be controlled under the condition of ensuring the high illumination of the center, and emergent light can meet various regulatory requirements.

Drawings

Fig. 1 is a schematic structural diagram of a light source device according to a first embodiment of the invention;

fig. 1A is a front view of a substrate of the light source device shown in fig. 1;

FIG. 1B is a simulation of the light source apparatus shown in FIG. 1 in a far field;

fig. 2 is a schematic structural diagram of a light source device according to a second embodiment of the invention;

fig. 3 is a schematic structural diagram of a light source device according to a third embodiment of the present invention;

fig. 4 is a schematic structural diagram of a light source device according to a fourth embodiment of the present invention;

fig. 5 is a schematic structural diagram of a light source device according to a fifth embodiment of the present invention;

fig. 6 is a schematic structural diagram of a light source device according to a sixth embodiment of the present invention.

Detailed Description

The invention starts from ADB car lamp regional lighting in the field of car lamp lighting, and aims to solve the problems of insufficient illumination of a central lighting area of a high beam and difficulty in control of area size, laser remote excitation fluorescent luminescent materials and LED array lighting are combined and combined with the characteristic of an imaging lighting system, so that a technical scheme that the area of the central high illumination area is controllable is obtained. However, the light source device of the present invention is not limited to the lighting of the car lamp, and can be applied to other fields requiring central high-illumination lighting, such as stage lighting, searchlights, etc.

The embodiments of the present invention will be described in detail below with reference to the drawings and the embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a light source device according to a first embodiment of the present invention, the schematic structural diagram is a side view, and the light source device includes a first light source module, a second light source module, an imaging lens group 130, a micro mirror 140, and a substrate 150. The first light source module comprises a laser light source 111, a wavelength conversion element 112 and an auxiliary LED113; the second light source module comprises an LED array which is arranged on the substrate 150 and consists of LEDs 121 and the like; the imaging lens group 130 includes a first lens 131 and a second lens 132.

The laser light source 111 and the wavelength conversion element 112 of the first light source module are separately disposed, the laser light source 111 is used for emitting excitation light, and the excitation light is reflected by the micro mirror 140 and then enters the wavelength conversion element 112 through the first lens 131. The wavelength conversion element 112 absorbs at least part of the excitation light and emits excited light having a wavelength different from that of the excitation light toward the first lens 131.

The second light source module and the wavelength conversion element 112 are disposed on the same side of the first lens 131 (left side in fig. 1), and both emit light toward the first lens 131, so that the imaging lens group 130 projects the light emitted from the second light source module and the wavelength conversion element to a far field for imaging.

The wavelength conversion element 112 is disposed on the optical axis of the imaging lens assembly 130, and the second light source module is disposed off the optical axis of the imaging lens assembly 130. Referring to fig. 1, fig. 1A and fig. 1B, fig. 1A is a front view of a substrate 150 of the light source device shown in fig. 1, and fig. 1B is a simulation diagram of the light source device shown in fig. 1 in a far field imaging mode. The LED arrays of the second light source module are distributed around the wavelength conversion element 112, the wavelength conversion element 112 is disposed on the optical axis and located at the center of the light source, and light spots similar to the arrangement distribution of the LED arrays and the wavelength conversion element are formed in the far field by projection imaging of the imaging lens group 130.

In this embodiment, the first light source module further includes an auxiliary LED113, the auxiliary LED113 is disposed on a side of the wavelength conversion element 112 away from the first lens 131, and the auxiliary LED113 and the wavelength conversion element 112 are located on the same optical axis of the imaging lens assembly.

In this embodiment, all the LED arrays of the second light source module are white LEDs, the auxiliary LED113 is a blue LED, the wavelength conversion element 112 includes YAG yellow phosphor, the laser light source 111 is a blue laser light source, blue light emitted by the auxiliary LED113 and blue laser emitted by the laser light source 111 are respectively incident on the wavelength conversion element 112 from both sides to be excited, and the generated yellow light is combined with the remaining blue light to form white light, which is emitted from a side close to the first lens 131. The surface of the LED array of the second light source module is not covered with the wavelength conversion element, and the projection of the wavelength conversion element 112 on the plane where the LED array is located does not overlap with the LED array, so that the white light emitted from the LED array can be directly emitted without being changed in wavelength range.

In this embodiment, the wavelength conversion element 112 includes yellow phosphor, it being understood that in other variations, the wavelength conversion element may also include red and green phosphors, emitting red and green stimulated light. The wavelength conversion element may be an organic fluorescent layer in which phosphor is bonded to a layer with an organic binder such as silica gel or resin, may be a fluorescent glass in which phosphor is bonded to a layer with glass frit softened, or may be a fluorescent ceramic or a fluorescent single crystal including a ceramic bonding material. The material composition of the wavelength converting element is not particularly limited in the present invention.

As shown in fig. 1, the substrate 150 further includes a groove 151, the auxiliary LEDs are disposed in the groove 151, and the LED array of the second light source module is disposed in the non-recessed portion of the substrate 150, such that the light-emitting surface of the wavelength conversion element 112 and the light-emitting surface of the LED array are located on the same plane. In order to allow the wavelength conversion element to emit light with high luminance, it is necessary to increase the output power of the laser light source 111 by thickening the wavelength conversion element 112. In the technical solution, the auxiliary LED113 is disposed in the substrate groove 151, so that a sufficient distance is provided from the light emitting surface of the auxiliary LED113 to the plane where the light emitting surface of the LED array is located to accommodate a wavelength conversion element with a sufficient thickness, on one hand, the wavelength conversion element can emit a received laser with sufficient brightness, and on the other hand, the wavelength conversion element and the LED array emit light in a coplanar manner, thereby achieving uniform imaging quality and controllable light distribution of the two. Preferably, the light exit surface of the wavelength conversion element 112 is disposed on the focal plane of the imaging lens group 130 to achieve clear far-field imaging.

In the embodiment, the micro mirror 140 is a reflecting prism (e.g. a 45 ° reflecting prism), and one surface of the reflecting prism is adhered to the light incident surface of the second lens 132 (e.g. a plano-convex lens), which is simple in structure and easy to process, and on the one hand, is beneficial to position fixing without an additional fixing structure; on the other hand, the process complexity of the scheme of integrally molding the micro-reflector and the second lens is avoided.

In a modified embodiment of this embodiment, the light source device further includes a controller for independently controlling the on/off of the laser light source 111 and the auxiliary LED 113. When the light source device is in a working state and the laser light source is in a closed state, the controller controls the auxiliary LED to be turned on and is matched with the second light source module to form emergent light, and at the moment, the emergent light cannot generate central dark spots because the laser light source is not turned on.

The controller can be connected with the sensor, and controls the switch of the laser light source and the auxiliary LED after receiving the sensor signal. For example, when the light source device is applied to a vehicle headlamp, when a vehicle moves at a low speed (for example, < 60 km/h), a speed sensor sends out a sensing signal according to the speed of the vehicle without illuminating a too far road, and after receiving the sensing signal, a controller enables a laser light source to be in a closed state and an auxiliary LED to be in an open state. For another example, when the laser light source fails or the micro-mirror falls off, causing the excitation light to fail to irradiate the wavelength conversion device, and the relevant sensor (for example, the optical sensor disposed near the auxiliary LED) does not receive the excitation light signal, a signal is sent to the controller to instruct the controller to turn off the laser light source and turn on the auxiliary LED. The sensor can also be a sensor for detecting smoke and fog, so that when the vehicle is in a smoke environment, the laser light source is turned off, self-dazzling after high-brightness light scattering is avoided, and meanwhile, the auxiliary LED is turned on by small current, so that the light source device emits orange/yellow light, and the penetrating power of light beams is improved. This is not further enumerated here.

Referring to fig. 2, the light source device includes a first light source module, a second light source module, an imaging lens group 230, a micro mirror 240, and a substrate 250. The first light source module comprises a laser light source 211, a wavelength conversion element 212 and an auxiliary LED213; the second light source module includes an LED array composed of LEDs 221 and the like disposed on the substrate 250; the imaging lens group 230 includes a first lens 231 and a second lens 232.

The difference from the first embodiment is that, in the second embodiment, the substrate 250 has no groove, and the projection of the wavelength conversion element 212 on the plane where the LED array of the second light source module is located covers the LED array.

In this embodiment, the wavelength conversion element may also be a fluorescent layer for emitting yellow light receiving laser light, or a fluorescent layer for emitting red light and green light receiving laser light, which is not described herein again.

A further difference with the embodiment is that since the wavelength converting element covers the exit face of the LED array, the exit light of the LED array is also partially absorbed by the wavelength converting element. Therefore, the LED array of the second light source module is a blue LED array, and the auxiliary LED is still a blue LED.

In this embodiment, since the wavelength conversion element covers all the LEDs, the exit surface of the wavelength conversion element close to the first lens 231 is the "object plane" with respect to the imaging lens group, and is naturally located on the same plane, which is beneficial to optimizing the imaging quality.

For the description of the other optical devices in this embodiment, please refer to the above embodiments, which are not repeated herein.

Referring to fig. 3, the light source device includes a first light source module, a second light source module, an imaging lens assembly 330, a micro mirror 340 and a substrate 350. The first light source module includes a laser source 311 and a wavelength conversion element 312; the second light source module includes an LED array composed of LEDs 321 and the like disposed on the substrate 350; the imaging lens group 330 includes a first lens 331 and a second lens 332.

Unlike the first and second embodiments, the first light source module in this embodiment has no auxiliary LED, and the wavelength conversion element 312 is directly disposed on the substrate 350.

The light-emitting surface of the wavelength conversion element 312 and the light-emitting surface of the LED array are on the same plane. Preferably, the light exit surface of the wavelength conversion element 312 is disposed on the focal plane of the imaging lens group 330 to achieve clear far-field imaging.

For the description of the other optical devices of the present embodiment, please refer to the above embodiments, which are not repeated herein.

Referring to fig. 4, the light source device includes a first light source module, a second light source module, an imaging lens group 430, a micro mirror 440, and a substrate 450. Wherein, the first light source module comprises a laser source 411, a wavelength conversion element 412 and an auxiliary LED413; the second light source module includes an LED array composed of LEDs 421 and the like disposed on the substrate 450; imaging lens group 430 includes a first lens 431 and a second lens 432; the substrate 450 includes a groove 451.

First, unlike the first embodiment shown in fig. 1, the fourth embodiment further includes a beam splitter 460 disposed on the light-emitting surface of the wavelength conversion element 412, and the beam splitter reflects the received laser light with an incident angle larger than a predetermined angle.

Due to the size limitation of the first lens 431, the imaging lens group cannot collect all the light emitted by 180 °, and there is inevitably a light loss from the substrate 450 to the first lens 431. In the technical scheme, by arranging the light splitting sheet 460, the light which is incident to the light splitting sheet 460 at a large angle of incidence in the emergent light of the wavelength conversion element 412 is reflected back to the wavelength conversion element 412 and is incident to the light splitting sheet 460 again after being scattered by the light splitting sheet 460 until all the light is incident to the light splitting sheet 460 at a small angle of incidence and is transmitted (i.e. finally, the light is emitted from the light splitting sheet 460 at a small angle of emergence), so that the collection of the emergent light of the light splitting sheet 460 by the first lens 431 is facilitated, the utilization rate of the light is improved, more light is projected to an imaging position, and the illumination of a high-illumination area is further improved. The light splitting sheet may be a sheet or a film layer, and the present invention is not limited thereto. The reflection and transmission characteristics of the light splitting sheet are not limited, and the utilization rate of emergent light of the wavelength conversion element can be improved as long as the light splitting sheet can reflect a part of large-angle light. Further specifically, the beam splitter reflects light having an incident angle of more than 60 ° and transmits other light, i.e., the preset angle is 60 °.

In this embodiment, the light-emitting surface of the LED array of the second light source module does not need to be provided with an incident angle splitter, and a large-angle light emitted from the LED needs to be utilized to realize uniform irradiation of a large area. It can be understood that a second light splitting sheet with an incident angle selection characteristic different from that of the light splitting sheet 460 (or called as a first light splitting sheet) may also be disposed on the light emitting surface of the LED array, or a first light splitting area covering the wavelength conversion element and a second light splitting area covering the LED array are disposed on one light splitting sheet, so that the light reflection critical angle of the second light splitting sheet or the second light splitting area is greater than the light reflection critical angle of the first light splitting sheet or the first light splitting area, and the light divergence angle of the light emitted from the wavelength conversion element is smaller than the light divergence angle of the light emitted from the LED array. The light reflection critical angle is the minimum incident angle at which the reflectivity of the incident light reflected by the light splitting sheet reaches 95%.

The first embodiment is different from the first embodiment shown in fig. 1 in that the laser light source 411 in the fourth embodiment is disposed on the substrate 450, and is reflected by the second micro-mirror 441 and the micro-mirror 440, and then enters the first lens 431. By the technical scheme, the laser light source 411 and the LED array can be used for radiating heat together, the integration level of a radiating system is improved, and the improvement of a radiating effect and the compactness of a structure are facilitated.

The second micro-reflector 441 is also adhered to the light incident surface of the second lens 432.

Of course, in the embodiments of fig. 1 to 3, the laser light source is disposed at the side of the imaging lens group, which also has a technical advantage that when the micromirror falls off from the second lens, the laser light is not directly emitted through the second lens, but is incident on the side of the light source device perpendicular to the emitting light path of the light source device, thereby avoiding damage to human eyes and the like.

Referring to fig. 5, the light source device includes a first light source module, a second light source module, an imaging lens group 530, a micro mirror 540, and a substrate 550. The first light source module comprises a laser source 511, a wavelength conversion element 512 and an auxiliary LED513; the second light source module includes an LED array composed of LEDs 521 and the like disposed on the substrate 550; the imaging lens group 530 includes a first lens 531 and a second lens 532; the substrate 550 includes a groove 551.

Different from the first embodiment shown in fig. 1, the fifth embodiment further includes a diffusion sheet 570, the diffusion sheet 570 is disposed between the LED array and the first lens 531, the diffusion sheet 570 is spaced from the LED array, and a projection of the diffusion sheet 570 on the screen where the LED array is located covers the LED array.

In the embodiment, the diffusion sheet 570 is arranged between the LED array and the first lens, so that light emitted by the LED array forms a spot array without a dark seam on the diffusion sheet 570, which is equivalent to making the diffusion sheet 570 become a new "object light source", and then the imaging lens group 530 projects the "object light source" to form an image in a far field, so as to obtain a light distribution without dark veins at a remote location.

In a preferred variant of this embodiment, the diffuser is located in the focal plane of the imaging lens group, so that the light spot distribution of the diffuser is optimally imaged in the far field, improving the imaging quality and the control of the light distribution area.

In another modified embodiment of the fifth embodiment, the diffusion sheet covers the light emitted from the LED array, and is at least partially hollowed out in the emitting direction of the wavelength conversion element.

Referring to fig. 6, the light source device includes a first light source module, a second light source module, an imaging lens group 630, a micro-mirror 640, and a substrate 650. Wherein, the first light source module includes a laser light source 611, a wavelength conversion element 612 and an auxiliary LED613; the second light source module comprises an LED array which is arranged on the substrate 650 and consists of LEDs 621 and the like; the imaging lens group 630 includes a first lens 631 and a second lens 632; the substrate 650 includes a cavity 651.

Unlike the first embodiment shown in fig. 1, the sixth embodiment further includes a light shielding sheet 680 movably disposed between the wavelength converting element 612 and the first lens 631, and when the light shielding sheet 680 is located at the first position (i.e. the position shown in the figure), the light shielding sheet 680 shields a portion of light emitted from the wavelength converting element 612, so that the light source device forms a first distribution of light; when the light-shielding sheet 680 is located at the second position (not shown in the drawings, see the solution without light-shielding sheet in fig. 1), the light-shielding sheet 680 does not shield the emergent light of the wavelength conversion element 612, so that the light source device forms the second distributed light.

With reference to fig. 5 and 6, when the light source device has both the diffusion sheet and the light-shielding sheet, the diffusion sheet and the light-shielding sheet can be disposed close to each other and both are disposed near the focal plane of the imaging lens set, so that the distribution of the emergent light is controllable, the profile of the light-shielding sheet is clear, and the quality consistency of the light source device after industrialization is facilitated.

The light source device of the invention can be applied to a headlamp system, in particular to a high beam illumination system. In the technical scheme including the light shield, the headlamp system can also be a high-low integrated headlamp system.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The differences in the embodiments may be combined with each other without conflict. For example, the light splitting sheet in the fourth embodiment, the diffusion sheet in the fifth embodiment, and the light shielding sheet in the sixth embodiment may be applied to other embodiments, respectively, and the laser light source position and the arrangement of the second micro-mirror in the fourth embodiment may also be applied to other embodiments, which are not listed here.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A light source device is characterized by comprising a first light source module, a second light source module, an imaging lens group, a micro reflector and a substrate;

the imaging lens group at least comprises a first lens and a second lens, and the micro mirror is arranged between the first lens and the second lens;

the first light source module comprises a laser light source and a wavelength conversion element which are arranged separately, the laser light source is used for emitting exciting light, the exciting light is reflected by a micro-reflector and then enters the wavelength conversion element through the first lens, the wavelength conversion element absorbs at least part of the exciting light and emits stimulated light with wavelength different from the exciting light towards the first lens, and the wavelength conversion element is arranged on an optical axis of the imaging lens group;

the second light source module comprises an LED array arranged on the substrate, the LED array and the wavelength conversion element are arranged on the same side of the first lens and are arranged by deviating from the optical axis of the imaging lens group, and the imaging lens group is used for projecting light emitted by the second light source module and the wavelength conversion element to a far field for imaging;

the first light source module further comprises an auxiliary LED, the auxiliary LED is arranged on one side of the first lens, which is far away from the wavelength conversion element, the auxiliary LED is arranged on an optical axis of the imaging lens group, the auxiliary LED is used for enabling the light source device to be in a working state and enabling the laser light source to be turned on when the laser light source is in a closed or fault state, and emergent light is formed by matching the second light source module.

2. The light source device according to claim 1, wherein the LED array is a white LED array, the auxiliary LED is a blue LED, the excited light is a combination of red light and green light or yellow light, and a projection of the wavelength conversion element on a plane where the LED array is located is not coincident with the LED array.

3. The light source device according to claim 1, wherein the substrate includes a recess, the auxiliary LED is disposed in the recess, the LED array is disposed in the non-recessed portion of the substrate, and the light-emitting surface of the wavelength conversion element and the light-emitting surface of the LED array are in the same plane.

4. The light source device according to claim 1, wherein the LED array is a blue LED array, the auxiliary LED is a blue LED, the excited light is a combination of red light and green light or yellow light, and a projection of the wavelength conversion element on a plane where the LED array is located covers the LED array.

5. The light source device according to claim 1, further comprising a controller for independently controlling the switches of the laser light source and the auxiliary LED, wherein the controller controls the auxiliary LED to be turned on when the light source device is in an operating state and the laser light source is in an off or fault state.

6. The light source device according to claim 1, wherein the wavelength conversion element is disposed on the substrate, and a light emitting surface of the wavelength conversion element and a light emitting surface of the LED array are on the same plane.

7. The light source device according to any one of claims 1 to 6, comprising a light splitter disposed on the light emitting surface of the wavelength conversion element, wherein the light splitter reflects the received laser light with an incident angle larger than a predetermined angle.

8. The light source device according to any one of claims 1 to 6, further comprising a diffuser located between the LED array and the first lens, the diffuser being spaced apart from the LED array, and a projection of the diffuser onto a plane of the LED array covering the LED array.

9. The light source device according to any one of claims 1 to 6, further comprising a light shielding sheet movably disposed between the wavelength conversion element and the first lens, wherein when the light shielding sheet is located at the first position, the light shielding sheet shields a portion of light emitted from the wavelength conversion element, so that the light source device forms a first distribution of light; when the light shielding sheet is located at the second position, emergent light of the wavelength conversion element is not shielded, so that the light source device forms light with second distribution.

10. The light source device according to any one of claims 1 to 6, wherein the micro-mirror is a reflecting prism bonded to the light incident surface of the second lens.

11. A headlamp system comprising a light source device as claimed in any one of claims 1 to 10.