Lighting devices, automobile headlights and lighting systems

Abstract

The present invention discloses a lighting device, a car headlight and a lighting system. The lighting device includes: an excitation light source, a first focusing element, a beam deflection device, a beam splitter, and a wavelength conversion device; the excitation light source is used to transmit the excitation light to the first focusing element, the first focusing element converges the received excitation light beam, and transmits the converged excitation light to the beam deflection device, the beam deflection device deflects the excitation light at a certain angle and transmits it to the beam splitter, the excitation light is transmitted to the wavelength conversion device, the wavelength conversion device is used to absorb part of the excitation light to form a stimulated light, the stimulated light and the excitation light not absorbed by the wavelength conversion device form an illumination light output. Through the above method, the present invention can simplify the design of the car light, reduce the cost of the car light, and can effectively expand the visible range and reduce the probability of accidents.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and in particular to a lighting device, a car headlight using the lighting device, and a lighting system. Background Art

[0002] Among the headlights of a car, lighting fixtures usually include LED headlights, xenon headlights and halogen headlights. Laser headlights are also used in a few high-end models. Laser lighting is an important development direction of future lighting technology.

[0003] For a given lamp, the direction, divergence angle, and color (color coordinates) of the light beam are usually unchangeable. In existing lamps, a blue laser is used as the excitation light source. The light emitted by the blue laser is focused on the fluorescent substrate through a lens. The excited fluorescence is mixed with the blue light to form white light, which is collimated and output through a reflector. This structure is relatively simple, but the direction, divergence angle, and color of the emitted light cannot be adjusted. Summary of the invention

[0004] The present invention provides a lighting device and a lighting system, which can simplify the design of vehicle lights, reduce the cost of vehicle lights, and effectively expand the visible range, thereby reducing the probability of accidents. The lighting device is suitable for vehicle lights in different scenarios.

[0005] In order to solve the above technical problems, another technical solution adopted by the present invention is: to provide a lighting device, the lighting device includes: an excitation light source, a first focusing element, a beam deflection device, a beam splitter, and a wavelength conversion device; the excitation light source is used to transmit the excitation light to the first focusing element, the first focusing element converges the received excitation light, and transmits the converged excitation light to the beam deflection device, the beam deflection device deflects the excitation light at a certain angle and transmits it to the beam splitter, the beam splitter is used to transmit the deflected excitation light to the wavelength conversion device, the wavelength conversion device is used to absorb part of the excitation light to form a stimulated light, the stimulated light and the excitation light not absorbed by the wavelength conversion device form the illumination light output.

[0006] In order to solve the above technical problems, another technical solution adopted by the present invention is: to provide an automobile headlight, wherein the automobile headlight comprises any one of the above-mentioned lighting devices.

[0007] In order to solve the above technical problem, another technical solution adopted by the present invention is: to provide a lighting system, wherein the lighting system comprises any one of the lighting devices described above.

[0008] The beneficial effects of the present invention are: providing a lighting device, a car headlight and a lighting system. By adding a beam deflection device, a beam splitter and a movable wavelength conversion device to the lighting system, the brightness, direction, energy distribution, divergence angle and color coordinates of the output light beam can be adjusted, and the design of the car headlight can be simplified, the cost of the car headlight can be reduced, and the visible range can be effectively expanded, the probability of accidents can be reduced, and the car lighting light source suitable for different scenes. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic structural diagram of a first embodiment of a lighting device according to the present invention;

[0010] Figure 2 is a schematic structural diagram of a second embodiment of the lighting device of the present invention;

[0011] Figure 3 1 is a schematic diagram comparing the excitation light spots when the light beam conversion device of the present invention is deflected and not deflected;

[0012] Figure 4 is a schematic diagram of energy comparison of light beams output by the lighting device of the present invention;

[0013] Figure 5 is a schematic structural diagram of a third embodiment of the lighting device of the present invention;

[0014] Figure 6 Schematic diagram of an embodiment of the light diffusion device of the present invention for adjusting the divergence angle of output light;

[0015] Figure 7 is a schematic structural diagram of a fourth embodiment of a lighting device according to the present invention;

[0016] Figure 8 is a schematic diagram of an embodiment of a driving device for translating a wavelength conversion device according to the present invention;

[0017] Fig. 9 Schematic diagram of the structure of an embodiment of the lighting system of the present invention

[0018] Fig.10 It is a schematic structural diagram of an embodiment of a laser projector of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Please also read Figure 1, Figure 1 The first embodiment of the lighting device of the present invention is a schematic structural diagram of the lighting device 10. The lighting device 10 comprises: an excitation light source 11, a first light focusing element 12, a beam deflection device 13, a beam splitter 14, a wavelength conversion device 15 and a second light focusing element 16.

[0021] Among them, the excitation light source 11 is used to transmit the excitation light beam to the first focusing element 12. In a specific embodiment of the present invention, the excitation light source 11 can be a blue laser or an ultraviolet laser. Compared with the traditional lighting device using LED lamps, xenon lamps and halogen lamps as light sources, the use of laser as a lighting method has high brightness and long service life. In addition, since the laser light beam has a small collimation divergence angle and the emitted light beam can be emitted in one direction in a relatively concentrated manner, the lighting distance can be greatly increased. At the same time, if the direction of the laser light beam is properly adjusted, it can be avoided that the light beam is shot at the oncoming car when meeting, thereby improving driving safety. In this embodiment, a blue laser is used as the excitation light source.

[0022] The first focusing element 12 is used to converge the received excitation light and transmit the converged excitation light to the beam deflection device 13. The first focusing element 12 used in this embodiment is a positive lens. Of course, in other embodiments, a wedge-shaped microlens, a spherical microlens or a conical microlens can also be used, and all of them converge the excitation light beam emitted by the excitation light source 11. Further, the lighting device 10 can also include a first collimating device A, which is arranged between the excitation light source 11 and the first focusing element 12, and is used to collimate the excitation light emitted by the excitation light source 11 to obtain parallel light, and further transmit the parallel light to the first focusing element 12.

[0023] The beam deflection device 13 used in this embodiment is used to deflect the converged excitation light beam by a certain angle and transmit it to the beam splitter 14. Furthermore, the direction in which the beam deflection device 13 deflects the converged light is adjustable. In this embodiment, the beam deflection device 13 can be driven by electro-optical, acousto-optical, magneto-optical, etc. to rotate by a certain angle, so that the excitation light is deflected by a certain angle after passing through the beam deflection device 13.

[0024] The beam splitter 14 is used to reflect the deflected blue light excitation beam to the wavelength conversion device 15. Specifically, the beam splitter used in the present application has a very small area, and can reflect the excitation light beam emitted by the excitation light source, while transmitting light of other bands. And the deflection angle of the beam splitter 14 is adjustable, so as to adapt to the angle of the excitation light passing through the beam deflection device 13. Specifically, the beam splitter 14 can adjust the angle of the excitation light incident on the wavelength conversion device 15, so as to facilitate the excitation light to be incident on a specific position of the wavelength conversion device 15. The deflection angle adjustment of the beam splitter 14 used in this embodiment can also be achieved by electro-optical, acousto-optical or magneto-optical means.

[0025] Furthermore, the lighting device 10 further includes a second focusing element 16, which is disposed between the beam splitter 14 and the wavelength conversion device 15, and is used to transmit the deflected excitation light to the wavelength conversion device 15 and to converge the illumination light output by the wavelength conversion device 15.

[0026] The wavelength conversion device 15 is used to absorb part of the excitation light to form a converted light, and the converted light and the excitation light not absorbed by the wavelength conversion device 15 form an illumination light to be emitted. Optionally, the side of the wavelength conversion device 15 facing away from the second light-concentrating element 16 is coated with a reflective film B, and the reflectivity distribution of the reflective film B is uneven. The reflective film B is used to reflect the converted light and the excitation light not absorbed by the wavelength conversion device 15 to the second light-concentrating element 16, and the second light-concentrating element 16 collects and converges the converted light and the excitation light and then emits them. Optionally, the reflective film B coated on the side of the wavelength conversion device 15 facing away from the second light-concentrating element 16 can be a material with uneven reflectivity. In other embodiments, it can also be composed of multiple reflective films with different reflectivities, specifically, multiple regions can be set on the surface of the wavelength conversion device 15 facing away from the second light-concentrating element 16, and the reflectivities of the reflective films in different regions are different, that is, the materials of the reflective films in different regions can be set to be different, so that the reflectivities of different regions are different. Specifically, some regions of the reflective film B are made of a material with a higher reflectivity, and some regions are made of a material with a lower reflectivity. During normal use, the excitation light irradiates the phosphor segment corresponding to the portion with higher reflectivity, so that the stimulated light and the unabsorbed excitation light are incident on the area of ​​the high reflectivity material, and the stimulated light and the unabsorbed excitation light are reflected by the reflective film B to form the emission of illumination light; when the color temperature of the illumination light needs to be adjusted in nighttime meeting or rainy and foggy weather, the deflection angle of the excitation light can be adjusted so that the excitation light irradiates the phosphor segment corresponding to the portion with lower reflectivity, so that the stimulated light and the unabsorbed excitation light are incident on the area of ​​the low reflectivity material, so that the light of some wavelength bands is transmitted through the area of ​​the low reflectivity material, thereby weakening the energy of this part of the wavelength band, thereby achieving the purpose of weakening the illumination light intensity or adjusting the illumination light color temperature.

[0027] It can be understood that in other embodiments, the reflective film B can also be formed by splicing and combining reflective films with different reflectivities.

[0028] It can be understood that in other embodiments, the low-reflection area of ​​the reflective film B can also be set on the side of the wavelength conversion device 15 facing the second focusing element 16, so as to weaken the light intensity of the excitation light irradiated on the wavelength conversion material, so as to achieve the purpose of adjusting the output light intensity and color temperature.

[0029] Furthermore, the fluorescent powder on the wavelength conversion device 15 can be specifically yellow fluorescent powder, which is excited by the blue light emitted by the excitation light source to generate yellow light, and is mixed with the blue light excitation beam of the unexcited fluorescent powder to obtain white light illumination.

[0030] In other embodiments of the present invention, when the excitation light source is an ultraviolet laser, the phosphor on the wavelength conversion device is at least two colors, specifically red, green and blue primary color phosphors, which are excited by the ultraviolet light emitted by the excitation light source, and mixed with the ultraviolet excitation beam of the unexcited phosphor to obtain white light illumination. Of course, it can also be two complementary colors of phosphors, such as yellow + blue phosphor, magenta + green phosphor, red + cyan phosphor, which are excited by ultraviolet light and mixed with the ultraviolet excitation beam of the unexcited phosphor to obtain white light illumination.

[0031] Now the specific principle of the lighting device is divided into two cases, which are summarized as follows:

[0032] 1) The beam deflection device does not change the direction of its transmitted beam

[0033] The excitation light source 11 used in the present application is a blue laser, and of course, in other embodiments, an ultraviolet laser can also be used. The blue excitation light beam emitted by it is converged by the first focusing element 12 and then transmitted to the beam deflection device 13, and the first focusing element 12 can be a positive lens. At this time, the beam deflection device 13 does not deflect, and the excitation light beam converged by the beam deflection device 13 is irradiated on the beam splitter 14. The area of ​​the beam splitter 14 is very small, which can reflect the blue excitation light and transmit other bands of light. After reflection, the blue excitation light passes through the second focusing element 16 and converges on the wavelength conversion device 15 to excite yellow fluorescence. The side of the wavelength conversion device 15 facing away from the second focusing element 16 is coated with a film with uneven reflectivity distribution, so that the stimulated fluorescence and the unabsorbed blue excitation light are reflected toward the second focusing element 16, collected by the second focusing element 16 and then projected toward the beam splitter 14, and form illumination light after transmission.

[0034] Please also read Figure 2 and Figure 3 , Figure 2 is a schematic structural diagram of a second embodiment of the lighting device of the present invention, Figure 3 It is a schematic diagram comparing the excitation light spots when the light beam conversion device of the present invention is deflected and not deflected.

[0035] 2) The beam deflection device changes the direction of the transmitted beam

[0036] The direction of the transmitted light beam by the beam deflection device 13 is adjustable and can be deflected at multiple angles as required. Further, the blue light excitation light beam emitted by the excitation light source 11 is converged by the first focusing element 12 and then transmitted to the beam deflection device 13, and the beam deflection device 13 deflects the transmitted blue light excitation light beam as follows: Figure 2 At a small angle as shown, when the deflected blue light excitation light beam is reflected by the beam splitter 14, it is affected by the deflection angle and will be incident on another position of the wavelength conversion device 15 after passing through the second focusing element 16. The fluorescence excited at this position will be collected by the second focusing element 16 and will also be deflected at a certain angle to be emitted. After being transmitted through the beam splitter 14, the output light beam is deflected at a certain angle relative to the output light beam when the beam deflection device 15 does not change the direction of the transmitted light beam. Therefore, the direction of the output light beam can be adjusted by controlling the deflection angle of the beam splitter 14.

[0037] like Figure 3 After the beam deflection device deflects the beam, the spot position of the blue light on the wavelength conversion device 15 also changes. If the wavelength conversion device 15 is designed in a certain way, the energy distribution and color coordinates of the final output light can be controlled.

[0038] See also Figure 4 , Figure 4 It is a schematic diagram of energy comparison of light beams output by the lighting device of the present invention.

[0039] In a specific embodiment of the present invention, the reflective film on the lower surface of the wavelength conversion device 15 is a low reflectivity film layer and its reflectivity is unevenly distributed on the side of the wavelength conversion device 15 facing away from the second focusing element 16. When the blue light spot is irradiated on the reflective film, part of the blue light is transmitted, and part is reflected and synthesized into white light with the excited fluorescence. Therefore, the energy of the output light beam will also be unevenly distributed, with low energy in a certain direction and relatively high energy in a certain direction. In a specific application scenario of the present invention, such as when driving at night or in foggy weather, by controlling the light beam deflection device 13 to change the illumination direction and energy distribution of the output light, it is possible to avoid strong light from shining into the eyes of the other driver and improve driving safety.

[0040] In other embodiments of the present invention, the brightness of the output light can be further adjusted by adjusting the output power of the excitation light source. For example, the brightness of the high beam and low beam can be adjusted in a timely manner as needed, and the illumination brightness of the high beam is generally higher than that of the low beam, so when adjusting the power of the excitation light source, its output power is greater than the output power when the low beam is used. Of course, in other embodiments, the brightness of the turn signal, fog light, double flash light and driving light can also be further adjusted by adjusting the output power of the excitation light source.

[0041] In the above embodiment, by adding a beam deflection device, a beam splitter and a movable wavelength conversion device to the lighting system, the brightness, direction, energy distribution, divergence angle and color coordinates of the output light beam can be adjusted, and an automotive lighting source suitable for different scenes can be obtained.

[0042] See also Figure 5 , Figure 5 The third embodiment of the lighting device of the present invention is a structural diagram of the third embodiment of the lighting device of the present invention. The third embodiment of the lighting device of the present invention is based on the first embodiment, and is a further extension of the first embodiment of the present invention. The same points as the first embodiment of the present invention are not repeated here.

[0043] The lighting device 20 includes: an excitation light source 21 , a first light focusing element 22 , a beam deflecting device 23 , a beam splitter 24 , a wavelength conversion device 25 , a second light focusing element 26 and a light diffusion device 27 .

[0044] Among them, the functions and specific implementation methods of the excitation light source 21, the first focusing element 22, the beam deflection device 23, the beam splitter 24, the second focusing element 26 and the wavelength conversion device 25 are detailed in the specific description of the first and second embodiments of the lighting device of the present application, and will not be repeated here.

[0045] The light diffusion device 27 is arranged between the beam deflection device 23 and the beam splitter 24, and is used to adjust the divergence angle of the output illumination light. The light diffusion device 27 can be a compound eye lens, and can be used in conjunction with the beam deflection device 23 to adjust the divergence angle of the excitation light and switch between the high and low beam lights. The light diffusion device 27 can change the size of the light spot irradiated on the wavelength conversion device 25, and the direction of the output light beam can be changed by changing the direction of the output light beam through the beam deflection device 23, so that the output illumination light with different divergence angles (that is, the output light beam angles can be made as different as possible) and different transmission directions can be obtained.

[0046] Further reading Figure 6 , Figure 6The figure is a schematic diagram of an embodiment of adjusting the divergence angle of the output light by the light diffusion device of the present invention. In an application scenario of the present invention, when the light diffusion device 27 is adjusted to enlarge the light spot on the wavelength conversion device 25, the divergence angle of the stimulated fluorescence will also increase accordingly. By adjusting the beam deflection device 23 to make the light beam shine on the ground in front of the car, a low beam lamp is formed. Conversely, by adjusting the light diffusion device 27 to make the light spot on the wavelength conversion device 25 smaller, and controlling the light beam to illuminate in parallel to the front, a high beam lamp is formed.

[0047] In other embodiments of the present invention, the brightness of the output light can be further adjusted by adjusting the output power of the excitation light source. For example, the brightness of the high beam and the low beam can be adjusted in a timely manner as needed, and the illumination brightness of the high beam is generally higher than that of the low beam, so when adjusting the power of the excitation light source, its output power is greater than the output power when the low beam is used. Of course, in other embodiments, the brightness of the turn signal, fog light, double flash light and driving light can also be further adjusted by adjusting the output power of the excitation light source.

[0048] The above embodiment, by adding a beam deflection device, a beam splitter, a wavelength conversion device and a light scattering device to the lighting system, can adjust the brightness, direction, energy distribution, divergence angle and color coordinates of the output light beam, and can obtain an automotive lighting source suitable for different scenes.

[0049] See also Figure 7 , Figure 7 It is a schematic structural diagram of a fourth embodiment of the lighting device of the present invention.

[0050] The fourth embodiment of the lighting device of the present invention is based on the first embodiment and is a further extension of the first embodiment of the present invention. The similarities with the first embodiment of the present invention will not be repeated here.

[0051] The lighting device 30 includes: an excitation light source 31, a first light focusing element 32, a beam deflection device 33, a beam splitter 34, a wavelength conversion device 35, a second light focusing element 36, a light diffusion device 37 and a driving device (not shown).

[0052] Among them, the functions and specific implementation methods of the excitation light source 31, the first focusing element 32, the beam deflection device 33, the beam splitter 34, the wavelength conversion device 35, the second focusing element 36 and the light scattering device 37 in this embodiment are detailed in the specific description of the first, second and third embodiments of the lighting device of the present application, and will not be repeated here.

[0053] Please also read Figure 8 , Figure 8 FIG. 1 is a schematic diagram of an embodiment of a driving device for translating a wavelength conversion device according to the present invention. Figure 8, different positions of the substrate of the wavelength conversion device 35 are coated with fluorescent powders of different colors, which can be yellow fluorescent powder or fluorescent powders of at least two colors, which can be yellow + blue fluorescent powder, magenta + green fluorescent powder, red + cyan fluorescent powder, etc., and the color of the fluorescent powder needs to be further determined according to the characteristics of the excitation light source. Wherein, the driving device is arranged on the wavelength conversion device 35, and is used to drive the wavelength conversion device 35 to translate or rotate, so that different areas of the wavelength conversion device 35 are exposed to the light path of the excitation light, so as to obtain converted light with different color coordinates. In other embodiments, the wavelength conversion device is in the form of a rotating color wheel or a color wheel cylinder, and a driving motor is arranged on the color wheel or the color wheel cylinder to drive the color wheel or the color wheel cylinder to rotate, so as to expose the areas provided with different wavelength conversion materials to the light path of the excitation light, so as to obtain converted light with different color coordinates. The present invention is not further limited here.

[0054] The excitation light source used in this embodiment is a blue laser. Furthermore, by precisely translating the substrate of the wavelength conversion device 35 through the driving device, the color of the output light can be changed to obtain output light with different color coordinates while the position and size of the blue light spot remain unchanged. In foggy weather, this method can increase the component of yellow excitation light in the output light, thereby increasing the lighting distance and further improving driving safety.

[0055] In other embodiments of the present invention, the brightness of the output light can be further adjusted by adjusting the output power of the excitation light source. For example, the brightness of the high beam and low beam can be adjusted in a timely manner as needed, and the illumination brightness of the high beam is generally higher than that of the low beam, so when adjusting the power of the excitation light source, its output power is greater than the output power when the low beam is used. Of course, in other embodiments, the brightness of the turn signal, fog light, double flash light and driving light can also be further adjusted by adjusting the output power of the excitation light source.

[0056] In the above embodiment, by adding a beam deflection device, a beam splitter, a wavelength conversion device, a light scattering device and a driving device to the lighting system, the brightness, direction, energy distribution, divergence angle and color coordinates of the output light beam can be adjusted, and an automotive lighting source suitable for different scenes can be obtained.

[0057] See also Fig. 9 , Fig. 9 FIG. 1 is a schematic diagram of the structure of an embodiment of the lighting system of the present invention. Fig. 9The lighting system 40 includes any lighting device D described in the above embodiments, and the principle and specific implementation of the lighting device D are described in detail in the above embodiments, which will not be repeated here. The lighting system referred to in this application may include but is not limited to indoor lighting systems (indoor atmosphere lights, spotlights, etc.), outdoor lighting systems (street lights), and lighting systems used in various types of transportation (cars, motorcycles, airplanes, ships, etc.).

[0058] See also Fig.10 , Fig.10 FIG. 1 is a schematic diagram of the structure of an embodiment of the present invention. Fig.10 The laser projector includes: an optical-mechanical module 51, a control module 52, a power drive module 53 and the lighting device E mentioned in any of the above embodiments.

[0059] Among them, the optical machine module 51 is composed of a uniform light illumination component 511, a display chip 512 and a projection lens 513. The lighting device E provides a usable light source for the lighting system, and the specific implementation of the lighting device E is described above and will not be repeated here. The optical machine module 51 receives the light source provided by the lighting system, wherein the uniform light illumination component 511 further uniformizes the light source, and the display chip 512 generates a picture under the real-time control of the control module 52, and the generated picture is projected through the projection lens 513 to project the picture to be displayed.

[0060] In summary, those skilled in the art can easily understand that the present invention provides a lighting device, a car headlight and a lighting system. By adding a beam deflection device, a beam splitter, a wavelength conversion device, a light scattering device and a driving device to the lighting system, the brightness, direction, energy distribution, divergence angle and color coordinates of the output light beam can be adjusted, so that a lighting light source suitable for different scenes can be obtained.

[0061] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A lighting device, characterized in that: The lighting device comprises: an excitation light source, a first focusing element, a beam deflection device, a beam splitter and a wavelength conversion device; The excitation light source is used to transmit the excitation light to the first light focusing element, the first light focusing element converges the received excitation light, and transmits the converged excitation light to the beam deflection device, the beam deflection device deflects the excitation light at a certain angle and transmits it to the beam splitter, the beam splitter is used to transmit the deflected excitation light to the wavelength conversion device, wherein the angle at which the beam deflection device deflects the excitation light is adjustable, so that the spot position of the excitation light on the wavelength conversion device also changes; The wavelength conversion device is used to absorb part of the excitation light to form a converted light, and the converted light and the excitation light not absorbed by the wavelength conversion device are emitted as illumination light; Among them, a reflective film is coated on the side of the wavelength conversion device facing away from the beam splitter, and multiple areas are arranged on the surface of the wavelength conversion device facing away from the beam splitter. The reflectivity of the reflective film in different areas is different, and the reflective film is used to convert the converted light and the excitation light not absorbed by the wavelength conversion device into illumination light for output.

2. The lighting device according to claim 1, characterized in that: The lighting device further includes a second focusing element, which is disposed between the beam splitter and the wavelength conversion device and is used to transmit the deflected excitation light to the wavelength conversion device and to focus the output light.

3. The lighting device according to claim 2, characterized in that: A reflective film is coated on the side of the wavelength conversion device facing away from the second focusing element. A plurality of regions are arranged on the surface of the wavelength conversion device facing away from the second focusing element. The reflective film has different reflectivities in different regions. The reflective film is used to reflect the converted light and the excitation light that is not absorbed by the wavelength conversion device to the second focusing element. The second focusing element collects and converges the converted light and the excitation light and then emits them.

4. The lighting device according to claim 1, characterized in that: It further comprises a light diffusion device, which is arranged between the beam deflection device and the beam splitter and is used to adjust the divergence angle of the excitation light.

5. The lighting device according to claim 1, characterized in that: The lighting device further comprises a driving device, which is arranged on the wavelength conversion device and is used to drive the wavelength conversion device to translate or rotate to obtain the converted light with different color coordinates.

6. The lighting device according to claim 1, characterized in that: The lighting device further includes a first collimating device, which is disposed between the excitation light source and the first light focusing element and is used to collimate the excitation light.

7. The lighting device according to claim 1, characterized in that: The excitation light source is blue light or ultraviolet laser.

8. The lighting device according to claim 1, characterized in that: The beam deflection device is driven by electro-optical, acousto-optical or magneto-optical means to rotate so as to adjust the angle of the excitation light.

9. The lighting device according to claim 8, characterized in that: The deflection angle of the beam splitter is adjustable to receive the excitation light passing through the beam deflection device and adjust the angle at which the excitation light is incident on the wavelength conversion device.

10. A car headlight, characterized in that: The automobile headlight comprises the lighting device according to any one of claims 1-9.

11. A lighting system, characterized in that: The lighting system comprises the lighting device according to any one of claims 1-9.

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