WO2021012883A1

WO2021012883A1 - Illumination device and automobile headlight

Info

Publication number: WO2021012883A1
Application number: PCT/CN2020/098606
Authority: WO
Inventors: 陈良晓; 张权; 陈彬; 蒋焕成; 马勇; 付锦江
Original assignee: 深圳市绎立锐光科技开发有限公司
Priority date: 2019-07-19
Filing date: 2020-06-28
Publication date: 2021-01-28
Also published as: CN112240533A

Abstract

An illumination device (10) comprises an excitation light source (111, 112) and a wavelength conversion unit (120). Excitation light emitted by the excitation light source (111, 112) is incident on the wavelength conversion unit (120), and excites light. The excited light and unabsorbed excitation light exit in a pre-configured direction to form exit light of the illumination device (10). The excitation light source (111, 112) comprises a laser light source unit (111) and an LED light source unit (112). A first light spot (S1) formed by the laser light source unit (111) on a surface of the wavelength conversion unit (120) is covered by a second light spot (S2) formed by the LED light source unit (112) on the surface of the wavelength conversion unit (120). The laser light source unit (111) and the LED light source unit (112) are separately controlled. The structure allows an automobile headlight comprising the illumination device (10) to integrate different illumination light distributions, and reduces the size of the illumination device (10) and the size of the automobile headlight.

Description

Lighting device and automobile headlight

Technical field

The present invention relates to the field of lighting technology, in particular to a lighting device and automobile headlights.

Background technique

At present, the light sources of automotive lighting mainly include halogen bulbs, xenon bulbs and LED light sources, among which LED light sources will become the mainstream of design. In addition, the laser light source can also be used for special lighting in automobiles due to its high energy density, such as super high beam.

In the current car lamp design, the laser super high beam is usually used as an independent module, which is mechanically combined with the traditional high and low beam. This increases the demand for design space for the entire car light module, which is inconsistent with the current mainstream trend.

In other lighting fields, such as flashlights, searchlights, stage lights, and car lights, it is hoped that multiple types of lighting light distribution can be realized in an integrated structure without significantly increasing the volume of the lighting device.

Therefore, it is necessary to develop a more integrated solution to reduce the volume of the overall lighting device while ensuring complete functions.

Summary of the invention

In view of the above-mentioned defects of the prior art lighting device of large volume and insufficient function integration, the present invention provides a lighting device with simplified structure and integrated functions, including an excitation light source and a wavelength conversion unit, and the excitation light emitted by the excitation light source is incident on the wavelength conversion Unit, and excite the received laser light, the received laser light and the unabsorbed excitation light are emitted in a preset direction to form the output light of the lighting device; the excitation light source includes a laser light source unit and an LED light source unit, and the laser light source unit is formed on the surface of the wavelength conversion unit The first light spot is covered by the second light spot formed on the surface of the wavelength conversion unit by the LED light source unit, and the laser light source unit and the LED light source unit can be independently controlled respectively.

Compared with the prior art, the present invention includes the following beneficial effects: the excitation light source is divided into a combination of a laser light source unit with high power density and an LED light source unit with low energy density, so that the laser light source unit is formed on the surface of the wavelength conversion unit. The light spot is covered by the second light spot formed on the surface of the wavelength conversion unit by the LED light source unit. The high-brightness, small-area illumination light distribution can be obtained by the excitation of the wavelength conversion unit by the laser light source unit, and it can be obtained by the excitation of the wavelength conversion unit by the LED light source unit Low-brightness, wide-area illumination light distribution, and through independent control of the two, with a minimum of devices to achieve a variety of illumination light distribution control. Compared with the prior art, this technical solution uses the multiplexing of the wavelength conversion unit and the multiplexing of the optical elements in the subsequent optical path to achieve device reduction, simplified structure, and independent light source control to achieve functional integration.

In one embodiment, the laser light source unit and the LED light source unit are incident from two opposite surfaces of the wavelength conversion unit, respectively, and the wavelength conversion unit is disposed on the light emitting surface of the LED light source unit.

In one embodiment, the excitation light emitted by the laser light source unit and the LED light source unit is incident from the same side of the wavelength conversion unit. Both light source units excite the wavelength conversion unit by remote excitation. On the one hand, the two heat sources of the light source unit and the wavelength conversion unit are spatially separated, which improves the heat dissipation effect of the wavelength conversion unit, and on the other hand, it is convenient to pass through intermediate optical devices. (Lens, etc.) The size of the excitation light spot is adjusted to achieve the effect of controlling the light distribution. The optical design is more flexible, which is beneficial to the improvement of product yield.

In one embodiment, a light reflection structure is provided on the side of the wavelength conversion unit away from the incidence of light. This technical solution can increase the utilization rate of the excitation light by the wavelength conversion unit and improve the light efficiency. A heat dissipation structure can also be arranged on the back of the light reflection structure to facilitate the conduction of the heat generated by the wavelength conversion unit.

In one embodiment, at least part of the excitation light is incident on the wavelength conversion unit through oblique incidence. Generally, the center beam of the received laser light emitted by the wavelength conversion unit has a large energy density. This technical solution introduces the excitation light through oblique incidence, which can prevent excessive received laser light from returning along the incident light path of the excitation light and losing.

In one embodiment, it further includes a refractive prism assembly disposed on the optical path between the excitation light source and the wavelength conversion unit, for refracting at least part of the excitation light and guiding it to enter the wavelength conversion unit. On the one hand, this technical solution can directly use the refractive prism assembly to realize the oblique incidence of the excitation light, avoiding the structural design and mechanical stability problems caused by placing the excitation light source obliquely, and on the other hand, the excitation light is transferred from the excitation light source to the wavelength The optical path of the conversion unit is disassembled into at least two segments from the excitation light source to the refractive prism assembly and from the refractive prism assembly to the wavelength conversion unit, which helps to improve the accuracy of the optical path design.

In one embodiment, the refractive prism assembly includes a first refractive prism and a second refractive prism, the first refractive prism is located on the optical path between the laser light source unit and the wavelength conversion unit, and the second refractive prism is located between the LED light source unit and the wavelength conversion unit On the optical path in between, the first refractive prism and the second refractive prism are distributed in a fan shape relative to the wavelength conversion unit.

In one embodiment, the light exit surface of the refractive prism assembly is far away from the light exit port of the lighting device with respect to the light entrance surface. When the refractive prism assembly fails or falls off, the excitation light emitted by the laser light source unit may be directly emitted from the illuminating device without the wavelength conversion unit, thereby causing optical safety problems. This technical solution makes the excitation light incident on the refractive prism assembly The direction deviates from the light emission direction of the illuminating device, even if the refractive prism component is dropped or damaged, it can prevent the excitation light from directly emitting, thereby improving the safety of the illuminating device.

In one embodiment, the wavelength conversion unit includes a light-transmitting heat-conducting layer on its light incident side, the light emitted by the laser light source unit is incident on the light-transmitting heat-conducting layer in a P polarization state, and the light incident angle is approximately Brewster angle. On the one hand, this technical solution improves the heat dissipation performance of the wavelength conversion unit to dissipate heat from both sides, and on the other hand, it can increase the light utilization rate of the emitted light of the laser light source unit and reduce the Fresnel reflection of the light.

In one embodiment, it further includes a light collection device for collecting and guiding the laser light emitted by the wavelength conversion unit to be emitted. The light collection device includes a reflective curved surface, a collection lens or a TIR lens.

In one embodiment, the light collection device includes a reflective curved surface with a light channel, and at least part of the excitation light is incident to the wavelength conversion unit through the light channel.

The present invention also provides an automobile headlight, including a high beam module, the high beam module includes the lighting device as described above, wherein, when the laser light source unit is turned off and the LED light source unit is turned on, the high beam module uses the normal high beam Mode output. When the laser light source unit is turned on, the high beam module outputs in super high beam mode. In the normal high beam mode, the beam brightness is lower within the brightness range that meets the requirements of regulations, and the irradiation range is wider; in the super high beam mode, the beam can meet the ultra-long distance lighting in a small range, especially when the laser light source unit and LED When the light source unit is turned on at the same time, it can not only meet the large illumination range, but also meet the ultra-long distance illumination.

In one embodiment, the car headlight further includes a low beam module, the low beam module includes a low beam LED light source, the low beam LED light source and the wavelength conversion unit are respectively located on both sides of the substrate, and the car headlight also includes a light barrier located on the low beam. The exit light path of the LED light source. This technical solution realizes low beam lighting, high beam lighting and super high beam lighting in an automobile headlight module, which greatly improves the integration degree of the automobile headlight and reduces the volume.

Description of the drawings

FIG. 1 is a schematic diagram of the structure of the lighting device according to the first embodiment of the present invention;

2 is a schematic diagram of the incident light spot of the wavelength conversion unit of the present invention;

Fig. 3 is a side view of a schematic structural diagram of a lighting device according to a second embodiment of the present invention;

4 is a top view of a schematic structural diagram of a lighting device according to Embodiment 2 of the present invention;

Fig. 5 is a schematic structural diagram of a lighting device according to a third embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a lighting device according to a fourth embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a lighting device according to Embodiment 5 of the present invention;

Fig. 8 is a schematic diagram of the structure of the automobile headlight of the present invention.

Detailed ways

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

Please refer to FIG. 1, which is a schematic structural diagram of a lighting device according to Embodiment 1 of the present invention. The lighting device 10 includes an excitation light source and a wavelength conversion unit 120. The excitation light source includes a laser light source unit 111 and an LED light source unit 112. The excitation light emitted by the excitation light source is incident on the wavelength conversion unit 120 and excites the received laser light, the received laser light and the remaining light source. The absorbed excitation light is emitted along a preset direction to form the emitted light of the lighting device 10.

In the present invention, the laser light source unit may be, for example, a semiconductor laser diode light source. Generally, for the needs of lighting and taking into account the cost issue, a blue laser diode light source can be selected. The LED light source unit can also be a blue light emitting diode, which can be a single LED or an LED array composed of multiple LEDs. The wavelength conversion unit can choose YAG series yellow fluorescent materials. This series of wavelength conversion materials have high conversion efficiency and stable materials. The yellow light emitted under the excitation of blue light is combined with the remaining blue light to form white light. The wavelength conversion unit can be an organic fluorescent structure encapsulated by silica gel or epoxy resin, or an inorganic fluorescent structure encapsulated by glass, or a fluorescent ceramic, such as single crystal Ce:YAG or polycrystalline Ce:YAG, or a transparent ceramic material (Such as alumina) encapsulated ceramic fluorescent structure.

It can be understood that under different lighting requirements, combinations of excitation light sources of other colors and wavelength conversion units can also be selected. Even in the case of special lighting requirements, such as military probe lighting, a combination of an excitation light source that finally emits infrared light and a wavelength conversion unit can be used.

Please refer to FIG. 2, which is a schematic diagram of the incident light spot on the wavelength conversion unit 120. The incident light spot of the laser light source unit 111 on the wavelength conversion unit 120 is the first light spot S1, and the incident light spot of the LED light source unit 112 on the wavelength conversion unit 120 is the second light spot S2. Wherein, the area of S2 is larger than the area of S1, and the second light spot covers the first light spot. The laser light source unit 111 and the LED light source unit 112 can be independently controlled. When the LED light source unit 112 is controlled to be turned on, the lighting device 10 forms a large-sized, low-energy density spot on the wavelength conversion unit 120, and the light is converted by the wavelength conversion unit 120 Then, illuminating light with a large irradiation range and low brightness is emitted; when the laser light source unit 111 is controlled to turn on, a small-sized, high-energy-density light spot is formed on the wavelength conversion unit 120, and the illuminating device 10 emits a small illuminating range and high-brightness Illumination light. By allowing the second light spot S2 to cover the first light spot S1, it is possible to avoid the occurrence of regional dark spots when the LED light source unit is turned on alone. For example, as shown in the figure, the first spot S1 is located at the center of the second spot S2, if the LED light source unit does not illuminate the area of the first spot S1, a central dark spot will be formed.

Specifically, in this embodiment, the lighting device 10 further includes a refractive prism assembly 130, a light collection device 140 and a substrate 150. The wavelength conversion unit 120 is disposed on the light-emitting surface of the LED light source unit 112, and the light emitted by the laser light source unit 111 and the LED light source unit 112 is incident from two opposite surfaces of the wavelength conversion unit 120 respectively, and the wavelength conversion unit 120 is excited on both sides. Wherein, the laser light source unit 111 is arranged away from the wavelength conversion unit 120 for remote excitation. The refractive prism assembly 130 is arranged on the optical path between the laser light source unit 111 and the wavelength conversion unit 120. The excitation light (which can be defined as the first excitation light) emitted by the laser light source unit 111 is refracted by the refractive prism assembly 130 and passes through the oblique incident light. The method is incident on the wavelength conversion unit 120. The LED light source unit 112 is arranged close to the wavelength conversion unit 120, and the excitation light (which can be defined as the second excitation light) emitted by the LED light source unit 112 is directly incident from the back of the wavelength conversion unit 120. It can be understood that the first light spot S1 and the second light spot S2 described in FIG. 2 can be regarded as the projection of two light spots on a plane, and it is not necessarily required that the first light spot S1 and the second light spot S2 are on the same surface. The light spots on the two opposite surfaces shown are also applicable.

After absorbing the excitation light (including the first excitation light and the second excitation light), the wavelength conversion unit 120 emits the received laser light and the unabsorbed excitation light, and the light is collected by the light collecting device 140 and guided out. In this embodiment, the light collection device 140 includes a reflective curved surface. In other embodiments of the present invention, the light collection device may also be other optical devices such as a collection lens, a TIR lens and the like.

Under the first embodiment and its various expanded technical solutions, the LED light source unit 112 and the wavelength conversion unit 120 are directly attached, and the LED light source unit 112 is disposed on the substrate 150, so that the wavelength conversion unit 120 and the LED light source unit 112 generate heat All of them need to be transmitted to the substrate 150 through the LED light source unit 112 and then diverged. On the one hand, the heat accumulation of the LED light source unit 112 is caused, and on the other hand, the heat dissipation of the wavelength conversion unit 120 is poor. In order to further improve the heat dissipation problem of the wavelength conversion unit, an embodiment of the present invention also designs the LED light source unit as a remote excitation method.

Please refer to FIGS. 3 and 4, which are schematic diagrams of the structure of the lighting device according to the second embodiment of the present invention. The lighting device 20 includes an excitation light source 210, a wavelength conversion unit 220, a refractive prism assembly 230, a light collection device 240, a substrate 250, and a lens assembly 260. The excitation light source 210 includes a laser light source unit 211 and an LED light source unit 212. The refractive prism assembly 230 includes a first refractive prism 231 and a second refractive prism 232. The lens assembly 260 includes a first lens 261 and a second lens 262. The lens 261 and the first refractive prism 231 are arranged on the optical path between the laser light source unit 211 and the wavelength conversion unit 220, and the second lens 262 and the second refractive prism 232 are arranged between the LED light source unit 212 and the wavelength conversion unit 220. On the way. The laser light source unit 211 and the LED light source unit 212 respectively emit first excitation light and second excitation light, wherein the first excitation light is incident on the wavelength conversion unit 220 through the first lens 261 and the first refractive prism 231, and the second excitation light passes through The second lens 262 and the second refractive prism 232 are incident on the wavelength conversion unit 220.

The difference between the second embodiment and the first embodiment is that the wavelength conversion unit 220 is directly disposed on the substrate 250, so the heat emitted by the wavelength conversion unit 220 can be directly dissipated through the heat dissipation structure on the substrate, which is beneficial to improve its thermal conductivity. .

Secondly, the excitation light emitted by the laser light source unit 211 and the LED light source unit 212 is incident from the same side of the wavelength conversion unit 220. Both light source units excite the wavelength conversion unit 220 in a remote excitation manner. On the one hand, the excitation light source is spatially separated The two heat sources and the wavelength conversion unit improve the heat dissipation effect of the wavelength conversion unit. On the other hand, it is convenient to adjust the size of the excitation light spot through intermediate optical devices (such as lenses, etc.), so as to achieve the effect of controlling the light distribution, and the optical design is more Flexibility is conducive to the improvement of product yield.

For example, the final light distribution of the illuminating device is determined by the light spot of the wavelength conversion unit and the light collection device, and the light spot of the wavelength conversion unit is determined by the incident spot of the excitation light. If an LED light source is used The unit is attached to the wavelength conversion unit, then the incident light spot of this part of the excitation light is determined by the size of the LED light source unit. Once the product has a slight deviation, it is difficult to adjust and correct, or once the product is finalized, it is difficult to adjust to different customer needs The emission light distribution is adjusted. The laser light source unit and the LED light source unit of this embodiment enter the wavelength conversion unit by remote excitation, and the size of the incident spot of the excitation light on the wavelength conversion unit can be adjusted by adjusting the front and rear positions of the lens, which greatly improves the convenience of adjusting the distribution of the emitted light. Sex.

In this embodiment, the wavelength conversion unit 220 is a reflective structure, and the side far away from the incident light is provided with a light reflection structure, so that the wavelength conversion unit 220 only emits light from one side.

Please continue to refer to FIGS. 3 and 4, the first refractive prism 231 and the second refractive prism 232 are distributed in a fan shape relative to the wavelength conversion unit 220, which can prevent the two from forming a shield. To facilitate precise alignment of the optical path, in this embodiment, the first refractive prism 231 and the second refractive prism 232 and the wavelength conversion unit 220 are disposed on the same substrate 250, and the substrate 250 is used to position the three. Then, the refractive prism assembly can be fixed on the substrate by dispensing glue.

In a modified embodiment of the present invention, the refractive prism assembly is arranged on a movable driving device, and the driving device can drive the refractive prism assembly to move within a certain range, thereby changing the incident light spot of the excitation light on the wavelength conversion unit. The position, in turn, affects the position of the illuminated area of the emitted light. In a specific embodiment, under the action of the driving device, the refractive prism assembly slightly swings, so that the spot of the excitation light source on the surface of the wavelength conversion unit moves left and right along the direction intersecting the direction of the light emitted by the lighting device, so that the lighting device The emitted light swings left and right to realize the AFS function in the car lights. In another embodiment, through the action of the driving device, the light spot of the excitation light source on the surface of the wavelength conversion unit moves back and forth in the same direction as the direction of the light emitted from the illuminating device, so that the illuminated area of the illuminating device moves back and forth. Such as the function of adaptive lighting adjustment for up and down slopes.

It can be understood that, as described above, the technical solution of disposing the refractive prism assembly and the wavelength conversion unit on the same substrate and the technical solution of disposing the refractive prism assembly on the driving device can be applied to the embodiment shown in FIG. 1 In the modified embodiments thereof, only the optical path design and mechanical structure design of the laser light source unit as a part of the excitation light source are only discussed, which will not be repeated here.

Please refer to FIG. 5, which is a schematic structural diagram of a lighting device according to Embodiment 3 of the present invention. Figure 5(a) is the lighting device under normal working condition, and Figure 5(b) is the lighting device under fault condition. For ease of description, the LED light source unit is hidden in the drawings of this embodiment, and the laser light source unit is only used as an example for description. It can be understood that the technical solution of this embodiment can be applied to the technical solution of "the excitation light emitted by the laser light source unit and the LED light source unit are incident from two opposite surfaces of the wavelength conversion unit" in the first embodiment, and the LED light source The unit is arranged on the back of the wavelength conversion unit; it can also be applied to the technical solution of "the excitation light emitted by the laser light source unit and the LED light source unit is incident from the same side of the wavelength conversion unit" in the second embodiment, and the LED light source unit is set as a remote excitation.

Specifically, in the third embodiment, in the normal working state, as shown in FIG. 5(a), the lighting device 30 includes a laser light source unit 311 as a part of the excitation light source, a wavelength conversion unit 320, a first refractive prism 331, and a light The collecting device 340, the substrate 350, the lens 361 and the light reflecting element 371. After the laser excitation light emitted by the laser light source unit 311 is collimated and shaped by the lens 361, it is reflected by the light reflecting element 371 to the light incident surface of the first refractive prism 311, and then the laser excitation light is refracted by the first refractive prism. It exits from the light exit surface and enters the wavelength conversion unit 320 to be excited to generate a received laser light, and the received laser light and the unabsorbed excitation light are collected by the light collecting device 340 and then emitted.

In this embodiment, the substrate 350 includes a groove, and the wavelength conversion unit is disposed in the groove. On the one hand, it facilitates the fixing of the wavelength conversion unit 320, and on the other hand, it can prevent the irregular light emitted from the edge of the wavelength conversion unit 320 from changing. Stray light into the lighting device. It can be understood that, in each of the foregoing embodiments, a groove may also be provided on the substrate, and the wavelength conversion unit may be arranged in the groove, which will not be repeated here.

In this embodiment, the main difference from the foregoing embodiments is that the excitation light source is guided to enter the wavelength conversion unit 320 through a unique light path design. In particular, the light exit surface of the refractive prism assembly (including the first refractive prism 331) is made far away from the light exit port of the lighting device 30 with respect to the light incident surface, which makes the direction of the excitation light incident on the refractive prism assembly and the light exit direction of the lighting device Diverge. When the failure as shown in Figure 5(b) occurs, the first refracting prism 331 falls off, causing the laser light source unit 311 to fail to enter the wavelength conversion unit. The excitation light will not be directly emitted from the illuminating device, but toward the side facing away from the illuminating device. The light emission direction is absorbed by the internal structure of the lighting device, which improves the light safety performance. If the technical solution shown in FIG. 1 or FIG. 3 is used, when the refractive prism assembly falls off, the excitation light emitted by the laser light source unit will be directly emitted, which may cause irreversible damage to human eyes.

Therefore, in order to improve the safety performance, the technical solution in the embodiment shown in FIG. 1 or FIG. 3 can be replaced with the technical solution shown in FIG. 5, so that the light exit surface of the refractive prism assembly is far away from the lighting device relative to the light entrance surface Light exit.

In the present invention, when the excitation light is incident on the wavelength conversion unit in an obliquely incident manner, Fresnel reflection may occur, causing the excitation light to directly exit without entering the wavelength conversion unit. In order to improve light utilization, in some embodiments of the present invention, the wavelength conversion unit further includes a light-transmitting and thermally conductive layer (such as a sapphire layer) on the light incident side, and the light emitted by the laser light source unit is incident on the light-transmitting layer in the P polarization state. The light-conducting layer, and the light incident angle is approximately Brewster's angle (it can be considered to be within the range of Brewster's angle ±3°). This makes the excitation light emitted by the laser light source unit basically enter the wavelength conversion unit, which greatly improves the light utilization rate. On the other hand, the light-transmitting and thermally conductive layer increases the heat dissipation path and the heat dissipation area of the wavelength conversion unit, which is beneficial to the heat dissipation of the wavelength conversion unit. The light emitted by the laser light source unit can be regarded as linearly polarized light. Therefore, by adjusting the direction of the emitted light, it is directly incident on the light-transmitting and thermally conductive layer in the P polarization state, which is convenient. It can be understood that in the technical solution in which the LED light source unit also excites the wavelength conversion unit by means of remote excitation, the excitation light emitted by the LED light source unit can be converted into linearly polarized light by the polarization conversion device, and be incident in the P polarization state, thereby achieving Improve the effect of excitation light utilization.

In each of the above embodiments, the lighting device includes a refractive prism component. In other embodiments of the present invention, the lighting device does not use a refractive prism component, but directly guides the excitation light to enter the wavelength conversion unit. As shown in FIG. 6, the lighting device 40 includes a laser light source unit 411, a wavelength conversion unit 420, a light collection device 440 and a substrate 450. For the convenience of description, the LED light source unit is also hidden. The LED light source unit can refer to the technical solutions in the above-mentioned embodiments, and the wavelength conversion unit can be excited on both sides of the wavelength conversion unit with the laser light source unit 411 or incident on the same side.

In the embodiment shown in FIG. 6, the light collection device 440 is a reflective curved surface, and the reflective curved surface includes a light channel through which the first excitation light emitted by the laser light source unit 411 is incident to the wavelength conversion unit.

In this embodiment, the light channel is a hole on the reflective curved surface. In a modified embodiment of this embodiment, the light channel may also be enclosed by the reflective curved surface and the substrate, that is, the excitation light can bypass the reflective curved surface and be incident into the internal space formed by the reflective curved surface and the substrate. Further, the optical path from the excitation light source to the wavelength conversion unit can be optimized through structures such as mirrors, lenses, etc., so as to improve the installation convenience and heat dissipation of the excitation light source.

In the above embodiments, the light collection device includes a reflective curved surface. In other embodiments of the present invention, the light collection device may further include a collection lens. Please refer to FIG. 7, which is a schematic structural diagram of a lighting device according to Embodiment 5 of the present invention. The lighting device 50 includes an excitation light source, a wavelength conversion unit 520, a refractive prism assembly, a light collection device 540, and a substrate 550. The excitation light source includes a laser light source unit 511 and an LED light source unit 512, the refractive prism assembly includes a first refractive prism 531 and a second refractive prism 532, wherein the first refractive prism 531 is disposed between the laser light source unit 511 and the wavelength conversion unit 520 The second refracting prism 532 is arranged on the optical path between the LED light source unit 512 and the wavelength conversion unit 520. The laser light source unit 511 and the LED light source unit 512 respectively emit first excitation light and second excitation light, wherein the first excitation light is incident on the wavelength conversion unit 520 through the first refractive prism 531, and the second excitation light passes through the second refractive prism 532 It is incident on the wavelength conversion unit 520. The light collection device 540 in this embodiment includes a collection lens for collecting the light emitted by the wavelength conversion unit 520 and projecting it to form illumination light.

In addition, in some other embodiments, the light collection device may also include a TIR lens, which is equivalent to the reflective curved surface, which is not repeated here.

It can be understood that the technical solution in which the light collection device is a collection lens or a TIR lens can also be replaced with the foregoing embodiments.

The lighting device of the present invention can be applied to a variety of lighting scenarios, such as car lights, stage lighting, outdoor lighting and the like. Please refer to FIG. 8, which is a schematic diagram of the structure of the automobile headlight of the present invention. The headlight of the automobile includes a low beam module and a high beam module, wherein the high beam module can refer to the technical solutions of the lighting device described in the above embodiments. Specifically, in the technical solution shown in the figure, the high beam module includes a laser light source unit 8, a high beam LED light source unit and a package 4 of the wavelength conversion unit, a refractive prism assembly 7 and an ellipsoidal reflector 3 (ie, light collecting Device), the low beam module includes a low beam LED light source 5 and an ellipsoidal reflector 6. In addition, the car headlight also includes a light barrier 2 and a projection lens 1. The light barrier 2 is located after the low beam LED light source is reflected by the ellipsoidal reflector 6. On the light path of the emitted light, it is used to control the light distribution. In addition, it also includes a substrate (not shown in the figure), and the low beam LED light source and the wavelength conversion unit are respectively located on both sides of the substrate, so that the two can share a heat dissipation structure and prevent crosstalk between high beam and low beam. In this embodiment, when the laser light source unit is controlled to be turned off and the high beam LED light source unit is turned on, the high beam module outputs in the normal high beam mode. When the laser light source unit is turned on (the high beam LED light source unit can also be turned on together), The high beam module outputs in super high beam mode.

This technical solution realizes low beam lighting, high beam lighting and super high beam lighting in an automobile headlight module, which greatly improves the integration degree of the automobile headlight and reduces the volume.

Although the figure shows an integrated car headlight with a combination of far and near beams and super high beam function, in some embodiments, the low beam module can also be removed, and only the high beam including the high beam mode and the super high beam mode are retained. The module is used as a car headlight, and the low beam module can exist as an independent lamp.

The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

The above are only the embodiments of the present invention and do not limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the description and drawings of the present invention, or directly or indirectly applied to other related technologies In the same way, all fields are included in the scope of patent protection of the present invention.

Claims

An illumination device, characterized in that it comprises an excitation light source and a wavelength conversion unit, the excitation light emitted by the excitation light source is incident on the wavelength conversion unit and excites the received laser light, the received laser light and the unabsorbed excitation light Is emitted in a preset direction to form the emitted light of the illumination device; the excitation light source includes a laser light source unit and an LED light source unit, and the first light spot formed by the laser light source unit on the surface of the wavelength conversion unit is used by the LED light source The second light spot formed by the unit on the surface of the wavelength conversion unit is covered, and the laser light source unit and the LED light source unit can be independently controlled respectively.
The lighting device according to claim 1, wherein the laser light source unit and the LED light source unit are incident from two opposite surfaces of the wavelength conversion unit, and the wavelength conversion unit is disposed on the LED. The light-emitting surface of the light source unit.
The lighting device according to claim 1, wherein the excitation light emitted by the laser light source unit and the LED light source unit is incident from the same side of the wavelength conversion unit.
The lighting device according to claim 3, wherein a light reflection structure is provided on a side of the wavelength conversion unit away from the incident light.
The lighting device according to claim 2 or 3, wherein at least part of the excitation light is incident on the wavelength conversion unit through oblique incidence.
The lighting device according to claim 5, further comprising a refracting prism assembly disposed on the optical path between the excitation light source and the wavelength conversion unit for refracting at least part of the excitation light and guiding it Incident to the wavelength conversion unit.
7. The lighting device according to claim 6, wherein the refractive prism assembly comprises a first refractive prism and a second refractive prism, and the first refractive prism is located between the laser light source unit and the wavelength conversion unit The second refractive prism is located on the optical path between the LED light source unit and the wavelength conversion unit, and the first refractive prism and the second refractive prism are fan-shaped relative to the wavelength conversion unit distributed.
7. The lighting device according to claim 6, wherein the light exit surface of the refractive prism assembly is far away from the light exit port of the lighting device with respect to the light incident surface.
The lighting device according to claim 5, wherein the wavelength conversion unit includes a light-transmitting and heat-conducting layer on its light incident side, and the light emitted by the laser light source unit is incident on the light-transmitting and heat-conducting layer in the P polarization state. Layer, and the light incident angle is roughly Brewster’s angle.
The illuminating device according to claim 1, further comprising a light collection device for collecting and guiding the laser light emitted by the wavelength conversion unit to be emitted, and the light collection device comprises a reflective curved surface, a collecting lens or a TIR lens.
11. The lighting device according to claim 10, wherein the light collection device comprises a reflective curved surface with a light channel, and at least part of the excitation light is incident to the wavelength conversion unit through the light channel.
An automobile headlight, characterized by comprising a high beam module, the high beam module comprising the lighting device according to any one of claims 1 to 11, wherein, when the laser light source unit is turned off and the LED light source unit When turned on, the high beam module outputs in a normal high beam mode, and when the laser light source unit is turned on, the high beam module outputs in a super high beam mode.
The automobile headlight according to claim 12, further comprising a low beam module, the low beam module comprises a low beam LED light source, the low beam LED light source and the wavelength conversion unit are respectively located on both sides of the substrate , The automobile headlight further includes a light barrier, which is located on the light path of the exit light of the low beam LED light source.