An automotive headlamp

Abstract

The present invention discloses an automobile headlamp, comprising a headlamp substrate, a laser, an LED light source, a reflector, a wavelength converter, and a lens. The laser and LED light source are mounted on the headlamp substrate. The laser emits laser light, which passes through the wavelength converter, the reflector, and the lens in sequence before being emitted. The light beam emitted by the LED light source passes through the reflector and the lens in sequence before being emitted. When the low beam of the headlamp is turned on, only the LED light source emits light, or the LED light source and a small portion of the laser light emit light simultaneously. When the high beam of the headlamp is turned on, the LED light source and the laser light emit light simultaneously. The present invention cleverly combines the laser light source and the LED light source, effectively utilizing the high luminous flux of the LED light source and the long range of the laser light source to achieve better high and low beam lighting effects.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile lighting, and more particularly to an automobile headlamp. Background Art

[0002] Car headlights, also known as car headlamps, are the eyes of a car. They are not only related to the appearance of the entire car, but also closely related to safe driving at night or in low visibility weather conditions. High-quality car headlights help improve driving safety and reduce accident rates.

[0003] Traditional automotive headlights utilize halogen and xenon lamps. With the continuous development of LED technology, it is gradually being incorporated into headlights. Compared to conventional halogen and xenon lamps, these bulbs typically have a lifespan of around 300 hours, consume high power, and require a long drive delay. LEDs, on the other hand, boast a lifespan exceeding 20,000 hours, high efficiency, and minimal additional wear and tear. Furthermore, LEDs offer advantages such as compact size, ease of use, and strong shock resistance, leading to their widespread adoption in mainstream consumer vehicles.

[0004] Semiconductor lasers, which emerged around the same time, not only possess most of the advantages of LED light sources—such as fast response speed, low brightness decay, compact size, low energy consumption, and long life—but also go further. For example, the first advantage is size. The length of a single laser diode can now be as small as 10μm, just 1% of that of a conventional LED component. This means that the size of automotive headlights can be significantly reduced, providing greater freedom in future vehicle design. Secondly, lasers offer low energy consumption. When meeting the same lighting conditions, laser headlights consume only 60% of the energy of LED headlights, further reducing energy consumption and better aligning with future automotive energy conservation and environmental trends. Furthermore, the uniquely strong directionality of lasers allows laser headlights to illuminate farther, enabling drivers to predict road conditions earlier and improving driving safety. Furthermore, laser light sources are closer to ideal point light sources, making it easier to achieve ideal design effects when designing optical light distribution. Therefore, as technology advances, the use of laser headlights will become increasingly widespread, similar to the trend of LEDs replacing xenon lamps.

[0005] However, in actual applications, considering that when the low beam of a car headlight is illuminated, a large area of the road at a close distance needs to be illuminated, a higher luminous flux is required. Therefore, the ultra-long effective distance advantage of the laser itself is not applicable in this case. Summary of the Invention

[0006] The present invention aims to overcome at least one defect of the above-mentioned prior art and provide a car headlamp. By using a combination of LED light source for low beam and laser light source for high beam, the car headlamp design is more reasonable and a better lighting effect is obtained.

[0007] The technical solution adopted by the present invention is:

[0008] A car headlamp includes a headlamp substrate, a laser, an LED light source, a reflector cup, a wavelength converter, and a lens. The laser and the LED light source are mounted on the headlamp substrate. The laser emits laser light, which passes through the wavelength converter, the reflector cup, and the lens in sequence before being emitted. The light beam emitted by the LED light source passes through the reflector cup and the lens in sequence before being emitted. When the low beam of the headlamp is turned on, only the LED light source is emitted from the lens, or the LED light source and a small portion of the laser light are emitted from the lens simultaneously. When the high beam of the headlamp is turned on, the LED light source and the laser light are emitted from the lens simultaneously.

[0009] In this technical solution, LED light sources can illuminate a large area at close range; while laser light sources have the advantage of long-range lighting. Therefore, this technical solution cleverly utilizes the combination of laser light sources and LED light sources to achieve better automotive lighting effects. Among them, the laser is mainly responsible for the high beam lighting of the car headlights, while the LED light source is mainly responsible for the low beam lighting of the car headlights. When the low beam of the headlight is turned on, the light beam is emitted entirely by the LED light source, or the light beam is mainly emitted by the LED light source and mixed with part of the light emitted by the laser light source; when the high beam of the headlight is turned on, the light beam is a mixture of the light beams emitted by the LED light source and the laser light source, which has a better lighting effect.

[0010] Furthermore, it also includes a high and low beam conversion baffle, which is arranged between the reflector cup and the lens and can be moved in and out of the light path to switch between high beam and low beam lighting.

[0011] In this technical solution, a low-beam switching block is designed to move in or out of the optical path, selectively blocking or unblocking the laser beam, thereby switching between low-beam and high-beam lighting. Specifically, when the low-beam headlight is turned on, the high-beam switching block moves into the optical path of the laser beam, thereby blocking most or all of the laser beam, achieving low-beam lighting; when the high-beam headlight is turned on, the high-beam switching block moves out of the optical path, unblocking the beam, allowing the laser and LED light sources to emit light simultaneously, achieving high-beam lighting.

[0012] In addition, the present technical solution is not limited to the method of switching between high and low beam lighting by the high and low beam switching block, and other methods that can achieve high and low beam lighting can also be used. For example, when the high beam is turned on, the LED light source and the laser light source are controlled to be illuminated simultaneously, so that the LED light source and the laser light source emit light simultaneously to achieve high beam lighting; when the low beam is turned on, the LED light source is controlled to be illuminated only, so that the LED light source emits light to achieve low beam lighting.

[0013] Furthermore, the headlight substrate is divided into a front part, a middle part and a rear part along the light emitting direction of the laser, wherein the laser is installed on the front part of the headlight substrate, the light beam emitted by the laser passes through the middle part and the rear part in sequence, and an inclined surface is provided between the middle part and the rear part, and the wavelength converter is provided on the inclined surface.

[0014] Furthermore, an extended line of the bottom surface of the headlamp substrate and the inclined surface form an angle, and the angle range of the angle is between 30° and 60°.

[0015] Furthermore, the middle portion of the headlamp substrate is recessed inwards.

[0016] Furthermore, the laser emits a laser beam of a first wavelength, which is irradiated on the wavelength conversion device and partially converted into an excitation beam, which is combined with the unconverted laser beam of the first wavelength to emit synthetic white light.

[0017] Furthermore, the headlamp substrate is made of metal, and a radiator is installed on at least one side of the headlamp substrate, and the radiator dissipates heat for the laser and the LED light source through the headlamp substrate.

[0018] In this technical solution, the headlamp substrate is closely adjacent to the radiator, and the laser and LED light source are arranged on the headlamp substrate. Through this setting structure, the heat generated by the laser and LED light source can be quickly transferred to the radiator to achieve a good heat dissipation effect.

[0019] Furthermore, the LED light source is arranged behind the wavelength converter and is closely attached to the wavelength converter.

[0020] Furthermore, as another embodiment, the LED light source is arranged before the wavelength converter and is closely attached to the wavelength converter.

[0021] In this structure, the LED light source is positioned between the laser and the wavelength converter. The laser beam emitted by the laser passes through the upper surface of the LED light source and strikes the wavelength converter, which is then excited to radiate an excitation beam. The LED light beam and the excitation beam emitted by the LED light source then intersect and intersect.

[0022] Furthermore, the reflective cup is arranged above the wavelength converter and the LED light source; the reflective cup includes a front section and a rear section, and the curvature of the longitudinal sections of the front section and the rear section are different, and the front section and the rear section are seamlessly spliced.

[0023] The longitudinal section refers to the section along the straight line connecting the focal points of the reflector cups. The LED light beam and the excitation light beam are projected onto reflectors with different curvatures of the longitudinal sections, and are collected and focused at different focal lengths by the reflectors with different curvatures of the longitudinal sections. Reflectors with different curvatures of the longitudinal sections have different focal lengths.

[0024] The front section of the reflective cup has a first front focus and a second front focus, and the rear section of the reflective cup has a first rear focus and a second rear focus; the position where the laser beam emitted by the laser is projected onto the wavelength converter is the center of the excitation point, and the first front focus is located on the center of the excitation point. Part of the laser beam emitted by the laser is excited by the wavelength converter to become an excitation beam, and the excitation beam is combined with the unexcited laser beam to form a synthetic white light. Most of the synthetic white light is collected by the front section of the reflective cup and focused on the second front focus; The first focus of the rear section is located on the light-emitting center of the LED light source, and most of the light beam emitted by the LED light source is collected by the rear section of the reflective cup and focused on the second focus of the rear section; a high and low beam conversion baffle is provided near the second focus of the front section, and the high and low beam conversion baffle moves into the position of the second focus of the front section to block all or part of the synthesized white light. The high and low beam conversion baffle moves out of the position of the second focus of the front section and does not block the synthesized white light. The high and low beam conversion baffle is switched into or out of the position of the second focus of the front section to achieve switching between high and low beam lighting.

[0025] Furthermore, the front second focus and the rear second focus are located on the same focal plane.

[0026] Furthermore, the synthetic white light focused on the second focal point of the front section and the LED light beam focused on the second focal point of the rear section partially overlap.

[0027] Furthermore, the optical axis position of the synthetic white light emitted from the lens is lower than the optical axis position of the LED light beam emitted from the lens.

[0028] Furthermore, the synthetic white light passes through the lens to form a small-angle illumination beam, and the LED light beam passes through the lens to form a large-angle illumination beam.

[0029] In this technical solution, the high and low beam conversion baffle is moved from the bottom of the headlamp into or out of the second focal position of the front section to realize high and low beam lighting, that is, when the high and low beam conversion baffle is moved out of the second focal position of the front section, the small-angle synthetic white light and the larger-angle LED light beam directly pass through the lens to form high beam lighting; when the high and low beam conversion baffle is moved into the second focal position of the front section, the baffle will block the passing light beam, and only the light beam above the baffle passes through, that is, the LED light beam passes through the lens to form low beam lighting; or the LED light beam and a small part of the synthetic white light pass through the lens to form low beam lighting.

[0030] Furthermore, a small portion of the light beam emitted by the LED light source is collected by the front section of the reflector and focused on the second focal point of the front section; and / or a small portion of the synthetic white light is collected by the rear section of the reflector and focused on the second focal point of the rear section.

[0031] Most of the LED beam is focused on the rear second focal point, creating a larger spot for low beam illumination. A small portion of the LED beam is focused on the front second focal point, obstructing low beam illumination and assisting high beam illumination during high beam illumination. Most of the excitation beam is focused on the front second focal point, obstructing low beam illumination during low beam illumination. A small portion of the excitation beam is focused on the rear second focal point, assisting low beam illumination during low beam illumination. During high beam illumination, the excitation beam and LED beam emit light together, achieving a better lighting effect.

[0032] Furthermore, the light beams emitted by the LED light source and the laser are emitted from the lower half of the lens.

[0033] Furthermore, the headlamp substrate is divided into an upper side and a lower side, the laser and the wavelength converter are respectively arranged on the lower side of the headlamp substrate; and the LED light source is arranged on the upper side of the headlamp substrate.

[0034] Furthermore, the reflective cup is divided into an upper reflective cup and a lower reflective cup; the upper reflective cup is arranged above the LED light source, and the lower reflective cup is arranged below the wavelength converter; the light beam emitted by the laser is reflected by the wavelength converter and the reflective cup in sequence and then projected out, and the light beam emitted by the LED light source is reflected by the reflective cup and then emitted.

[0035] Furthermore, the curved surface of the reflector is a portion of an ellipsoidal surface, and the upper and lower reflectors have different ellipsoidal focal lengths. The upper reflector has a first upper focal point and a second upper focal point, and the lower reflector has a first lower focal point and a second lower focal point. The first upper focal point is located at the light emission center of the LED light source, and most of the light beam emitted by the LED light source is collected by the upper reflector and focused at the second upper focal point. The position where the light beam emitted by the laser is projected onto the wavelength converter is the center of the excitation point, and the first lower focal point is located at the center of the excitation point. Part of the laser beam emitted by the laser is excited by the wavelength converter to become an excitation beam. The excitation beam and the unexcited laser beam are combined to form a synthetic white light, which is collected by the lower reflector and focused at the second lower focal point. A high-low beam switching block is provided near the second lower focal point. The high-low beam switching block moves into the position of the second lower focal point to block all or part of the synthetic white light, and moves out of the position of the second lower focal point to not block the synthetic white light. The high-low beam switching block switches between high and low beam lighting by moving into or out of the position of the second lower focal point.

[0036] Furthermore, the second upper focus and the second lower focus are on the same focal plane, and the focal plane is perpendicular to the light emitting axis of the headlamp.

[0037] Furthermore, the synthetic white light is focused below the focal plane through the reflector cup and projected onto the upper half of the lens; the light beam emitted by the LED light source is focused above the focal plane through the reflector cup and projected onto the lower half of the lens.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention cleverly combines laser light sources and LED light sources, effectively utilizing the high luminous flux of LED light sources and the long-distance range advantages of laser light sources. When the low beam is on, only the LED light source emits light, or the LED light source and a small part of the laser light source emit light; when the high beam is on, the LED light source and the laser light source emit light at the same time, thereby achieving better high and low beam lighting effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a structural diagram of Example 1.

[0041] Figure 2 This is a schematic diagram of the installation of the laser light source and the LED light source in Example 1.

[0042] Figure 3 Schematic diagram of the reflective cup after the laser and LED are mixed in Example 1.

[0043] Figure 4This is a schematic diagram of the high beam state of a laser and LED hybrid automobile headlamp in Example 1.

[0044] Figure 5 This is a schematic diagram of the low-beam state of a laser-LED hybrid automobile headlamp in Example 1.

[0045] Figure 6 Schematic diagram of the optical path of the laser light source of the automobile headlight in Example 2.

[0046] Figure 7 Schematic diagram of the light path of the LED light source of the automobile headlight in Example 2.

[0047] Figure 8 This is a schematic diagram of the high-beam state of a car headlamp that combines a laser light source and an LED light source in Example 2.

[0048] Figure 9 This is a schematic diagram of the low-beam state of a car headlamp that combines a laser light source and an LED light source in Example 2.

[0049] Figure 10 Schematic diagram of the mixed light path of the automotive headlamp laser and LED light source in Example 3.

[0050] Figure 11 This is a schematic diagram of the high beam state of a car headlamp that combines a laser light source and an LED light source in Example 3.

[0051] Figure 12 This is a schematic diagram of the low-beam state of a car headlamp that combines a laser light source and an LED light source in Example 3. DETAILED DESCRIPTION

[0052] The accompanying drawings are for illustrative purposes only and are not to be construed as limiting the present invention. To better illustrate the following embodiments, some components in the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will appreciate that some well-known structures and their descriptions may be omitted from the accompanying drawings.

[0053] Example 1

[0054] like Figure 1 and Figure 2 As shown, an automobile headlamp includes a headlamp substrate 100, a laser 200, an LED light source 400, a reflector cup 500, a wavelength converter 300 and a lens 700. The laser 200 and the LED light source 400 are mounted on the headlamp substrate 100. The light beam 201 emitted by the laser 200 passes through the wavelength converter 300, the reflector cup 500 and the lens 700 in sequence before being emitted. The light beam emitted by the LED light source 400 passes through the reflector cup 500 and the lens 700 in sequence before being emitted.

[0055] Among them, it also includes a high and low beam conversion baffle 800, which is arranged between the reflective cup 500 and the lens 700. By designing the high and low beam conversion baffle 800 to move in or out of the light path, it can selectively block or not block all or part of the light beam emitted by the laser 200, thereby realizing switching between low beam and high beam lighting.

[0056] Among them, when the low beam of the headlight is turned on, the high and low beam conversion baffle 800 moves into the optical path of the outgoing light beam of the laser 200, thereby blocking most or all of the light beam emitted by the laser 200, and realizing low beam lighting; when the high beam of the headlight is turned on, the high and low beam conversion baffle 800 moves out of the optical path and does not block the light beam, so that the light beams of the laser 200 and the LED light source 400 are emitted at the same time, realizing high beam lighting.

[0057] The headlamp substrate 100 is divided into a front portion, a middle portion, and a rear portion along the light emitting direction of the laser 200. The laser 200 is installed on the front portion of the headlamp substrate 100. The light beam emitted by the laser 200 passes through the middle portion and the rear portion in sequence. The middle portion has a concave trapezoidal structure, and an inclined surface is provided between the middle portion and the rear portion. The wavelength converter 300 is provided on the inclined surface.

[0058] like Figure 2 As shown, an angle θ is formed between an extension line of the bottom surface of the headlamp substrate 100 and the inclined surface, and the angle θ is in a range of 30° to 60°.

[0059] The laser 200 emits a laser beam of a first wavelength, which is partially converted into an excitation beam 202 when irradiated on the wavelength conversion device 300. The excitation beam 202 and the unconverted first wavelength laser beam are combined into white light for emission.

[0060] like Figure 1 As shown, the headlamp substrate 100 is made of metal, and a radiator 900 is installed on at least one side of the headlamp substrate 100 . The radiator 900 dissipates heat for the laser 200 and the LED light source 400 through the headlamp substrate 100 .

[0061] In this technical solution, the headlamp substrate 100 is closely adjacent to the radiator 900, and the laser 200 and the LED light source 400 are arranged on the headlamp substrate 100. Through such a setting structure, the heat generated by the laser 200 and the LED light source 400 can be quickly transferred to the radiator 900 to achieve a good heat dissipation effect.

[0062] The LED light source 400 is disposed behind the wavelength converter 300 and is closely attached to the wavelength converter 300. The wavelength converter 300 is disposed on the inclined surface of the trapezoidal structure, and the LED light source 400 is disposed on the top of the trapezoidal structure.

[0063] like Figure 3 As shown, the reflective cup 500 is arranged above the wavelength converter 300 and the LED light source 400. The light beam emitted by the laser 200 is reflected by the wavelength converter 300 and the reflective cup 500 in sequence and then projected out. The light beam emitted by the LED light source 400 is reflected by the reflective cup 500 and then emitted.

[0064] The reflective cup 500 includes a front section 501 and a rear section 502 , and the curvature of the longitudinal sections of the front section 501 and the rear section 502 are different. The front section 501 and the rear section 502 are seamlessly connected.

[0065] The curved surface of the reflector 500 is a portion of an ellipsoidal surface, and the ellipsoidal focal lengths corresponding to the front section 501 and the rear section 502 of the reflector 500 are different. The ellipsoids on which the curved surfaces of the front section 501 and the rear section 502 of the reflector 500 are located are two ellipsoids with different major and minor axes. The front section 501 of the reflector 500 has a first front focus and a second front focus 600, and the rear section 502 of the reflector 500 has a first rear focus and a second rear focus (not shown). The second front focus 600 and the second rear focus are located on the same focal plane and are adjacent to each other. Light rays at the positions of the second front focus 600 and the second rear focus at least partially overlap.

[0066] In this technical solution, a portion of the laser beam 201 emitted by the laser 200 is excited by the wavelength converter 300 to become an excitation beam 202. The excitation beam 202 is combined with the unexcited laser beam 201 to form white light. Most of the synthesized white light is collected by the front section 501 of the reflector 500 and focused on the second focal point 600 of the front section. The light beam emitted by the LED light source 400 is projected onto the reflector 500, and most of it is collected by the rear section 502 of the reflector 500 and focused on the second focal point of the rear section of the reflector 500 (not shown in the figure). The LED beam and the synthesized white light are combined at the second focal point 600 of the front section and the second focal point of the rear section. The combined light beam is transmitted through the lens 700, which projects the light beam in front of the vehicle.

[0067] Among them, the high and low beam conversion baffle 800 moves into the focal position corresponding to the excitation light beam 202, blocking all or part of the synthetic white light to achieve low beam lighting, and the high and low beam conversion baffle 800 moves out of the focal position corresponding to the excitation light beam 202, does not block the synthetic white light, and achieves high beam lighting.

[0068] The position where the light beam emitted by the laser 200 is projected onto the wavelength converter 300 is the center of the excitation point, and the center of the excitation point is located at the first focus of the front section. Part of the laser beam 201 emitted by the laser 200 is excited by the wavelength converter 300 to become the excitation beam 202. The excitation beam 202 is combined with the unexcited laser beam 201 to form a synthetic white light. Most of the synthetic white light is collected by the front section 501 of the reflective cup 500 and focused on the second focus 600 of the front section. The light emission center of the LED light source 400 is located at the first focus of the rear section. 00, most of the light beam emitted is collected by the rear section 502 of the reflective cup 500 and focused on the second focus of the rear section; a high and low beam conversion baffle 800 is provided near the second focus 600 of the front section, and the high and low beam conversion baffle 800 moves into the position of the second focus 600 of the front section to block all or part of the synthesized white light to achieve low beam lighting, and the high and low beam conversion baffle 800 moves out of the position of the second focus 600 of the front section without blocking the synthesized white light to achieve high beam lighting, and the high and low beam conversion baffle 800 switches between high and low beam lighting by moving into or out of the position of the second focus 600 of the front section.

[0069] The synthetic white light focused on the front second focus 600 and the LED light beam focused on the rear second focus partially overlap.

[0070] The optical axis position of the synthetic white light emitted from the lens 700 is lower than the optical axis position of the LED light beam emitted from the lens 700.

[0071] The synthetic white light passes through the lens 700 to form a small-angle illumination beam, and the LED light beam passes through the lens 700 to form a large-angle illumination beam.

[0072] like Figure 4 and Figure 5 As shown, when the high and low beam conversion baffle 800 moves out of the front second focus 600 position, the small-angle synthetic white light and the larger-angle LED light beam directly pass through the lens 700 to form high beam illumination; and when the high and low beam conversion baffle 800 moves into the front second focus 600 position, the high and low beam conversion baffle 800 will block the passing light beam, and only the light beam above the high and low beam conversion baffle 800 passes, that is, the LED light beam passes through the lens 700 to form low beam illumination; or the LED light beam and a small part of the synthetic white light pass through the lens 700 to form low beam illumination.

[0073] A small portion of the light beam emitted by the LED light source 400 is collected by the front section 501 of the reflective cup 500 and focused on the second focal point 600 of the front section; and a small portion of the synthetic white light is collected by the rear section 502 of the reflective cup 500 and focused on the second focal point of the rear section.

[0074] The majority of the LED beam is focused on the rear second focal point, forming a larger spot for low beam illumination. A small portion of the LED beam is focused on the front second focal point 600, being blocked during low beam illumination. During high beam illumination, it assists high beam illumination. The majority of the synthetic white light is focused on the front second focal point 600, being blocked during low beam illumination. A small portion of the synthetic white light is focused on the rear second focal point, assisting low beam illumination. During high beam illumination, the synthetic white light and the LED beam are emitted together to achieve a better lighting effect.

[0075] The light beams emitted by the LED light source 400 and the laser 200 are emitted from the lower half of the lens 700 .

[0076] Example 2

[0077] like Figures 6 to 9 As shown, the difference between this embodiment and embodiment 1 is that the LED light source 400 is arranged before the wavelength converter 300 and is closely attached to the wavelength converter 300. The wavelength converter 300 is arranged on the inclined surface of the trapezoidal structure, and the LED light source 400 is arranged at the bottom of the trapezoidal structure.

[0078] In this technical solution, the LED light source 400 is disposed between the laser 200 and the wavelength converter 300. The laser beam emitted by the laser 200 passes through the upper surface of the LED light source 400 and irradiates the wavelength converter 300. The wavelength converter 300 is excited to radiate the excitation beam 202. The LED light beam emitted by the LED light source 400 and the excitation beam 202 meet and intersect.

[0079] A small portion of the light beam emitted by the LED light source 400 is focused by the front section 501 of the reflector 500 at the second focal point 600 of the front section of the reflector 500, forming a smaller spot. The majority of the light is focused by the rear section 502 of the reflector 500 at the second focal point of the rear section, forming a larger spot. The focused LED light is simultaneously projected forward through the lens 700 to form both high-beam and low-beam illumination. Specifically, the light that forms the smaller spot at the second focal point 600 of the front section provides the normal high-beam illumination, while the light that forms the larger spot provides the low-beam illumination.

[0080] The laser 200 emits a beam that resembles a point light source. This beam is directed to the wavelength conversion device, where it illuminates the wavelength conversion device with a smaller spot size. Part of the laser light is absorbed by the wavelength conversion device and converted into excitation light. The excitation beam 202 emitted by the wavelength conversion device is largely collected by the front section 501 of the reflector 500 and focused at the second focal point 600 of the front section, forming a smaller spot size. This focused excitation light passes through the lens 700 and provides auxiliary high-beam illumination for longer-range headlights.

[0081] The high-low beam switching block 800 can be moved in or out of a position near the front second focal point 600 to achieve high-low beam lighting switching. That is, when the high-low beam switching block 800 is moved out of the optical path at the front second focal point 600, the laser beam and the LED beam directly pass through the lens 700 to form high beam lighting, that is, all beams directly pass through the lens 700 to form high beam lighting; when the high-low beam switching block 800 is moved into the optical path at the front second focal point 600, the high-low beam switching block 800 blocks the passing beams, and only the beam above the high-low beam switching block 800 passes through, that is, the LED beam passes through the lens 700 to form low beam lighting; or the LED beam and a small portion of synthesized white light pass through the lens 700 to form low beam lighting.

[0082] Example 3

[0083] like Figures 10-12 As shown, the difference between this embodiment and embodiment 1 is that the headlamp substrate 100 is divided into an upper side and a lower side, and the trapezoidal structure, the laser 200 and the wavelength converter 300 are respectively arranged on the lower side of the headlamp substrate 100; the LED light source 400 is arranged on the upper side of the headlamp substrate 100.

[0084] The reflective cup 500 is divided into an upper reflective cup and a lower reflective cup; the upper reflective cup is arranged above the LED light source 400, and the lower reflective cup is arranged below the wavelength converter 300; the light beam emitted by the laser 200 is reflected by the wavelength converter 300 and the reflective cup 500 in sequence and then projected out, and the light beam emitted by the LED light source 400 is reflected by the reflective cup 500 and then emitted.

[0085] The arc surface of the reflective cup 500 is a part of the ellipsoidal surface, and the upper reflective cup and the lower reflective cup have different ellipsoidal focal lengths. The upper reflective cup has a first upper focus and a second upper focus 601, and the lower reflective cup has a first lower focus and a second lower focus (not shown in the figure). The light emission center of the LED light source 400 is located at the first upper focus, and most of the light beam emitted by the LED light source 400 is collected by the rear section 502 of the reflective cup 500 and focused on the second upper focus 601. The position where the light beam emitted by the laser 200 is projected onto the wavelength converter 300 is the excitation point center, and the excitation point center is located at the first lower focus. Focus, part of the laser beam emitted by the laser 200 is excited by the wavelength converter 300 to become the excitation beam 202, and the excitation beam 202 is combined with the unexcited laser beam 201 to form white light. Most of the synthetic white light is collected by the lower reflective cup and focused on the second lower focus; a high and low beam conversion baffle 800 is provided near the second lower focus, and the high and low beam conversion baffle 800 moves into the position of the second lower focus to block all or part of the synthetic white light; moves out of the position of the second lower focus without blocking the synthetic white light. The high and low beam conversion baffle 800 switches the high and low beam lighting by moving into or out of the position of the second lower focus.

[0086] The second upper focus 601 and the second lower focus are on the same focal plane, and the focal plane is perpendicular to the light emitting axis of the headlamp.

[0087] The synthetic white light is focused below the focal plane by the reflector cup 500 and projected onto the upper half of the lens 700 ; the LED light beam is focused above the focal plane by the reflector cup 500 and projected onto the lower half of the lens 700 .

[0088] The second upper focal point 601 of the upper reflector and the second lower focal point of the lower reflector form a common focal plane perpendicular to the optical axis of the headlight. The LED light focused by the upper reflector is located above the excitation light focused by the lower reflector. This allows the focused LED light and the excitation light to be projected forward through lens 700 to achieve a uniform lighting effect. The LED light above the focal plane passes through lens 700 and is projected below the illuminated area in front of the vehicle, while the excitation light is located above the illuminated area. This resulting LED beam is more conducive to low-beam lighting, while the excitation light is more conducive to long-range high-beam lighting.

[0089] This design advantage makes full use of the laser as an ideal light source and can make the angle of the light beam narrower to achieve better lighting effects.

[0090] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A car headlamp, characterized in that: The headlamp comprises a headlamp substrate, a laser, an LED light source, a reflector cup, a wavelength converter, and a lens. The laser and the LED light source are mounted on the headlamp substrate. The laser emits laser light, which passes through the wavelength converter, the reflector cup, and the lens in sequence before being emitted. The light beam emitted by the LED light source passes through the reflector cup and the lens in sequence before being emitted. The reflective cup is arranged above the wavelength converter and the LED light source; the reflective cup includes a front section and a rear section, and the curvature of the longitudinal sections of the front section and the rear section are different, and the front section and the rear section are seamlessly spliced; the curved surface of the reflective cup is a portion of an ellipsoidal surface, and the ellipsoidal focal lengths corresponding to the front section and the rear section of the reflective cup are different; the front section of the reflective cup has a first front section focus and a second front section focus, and the rear section of the reflective cup has a first rear section focus and a second rear section focus; The position where the laser beam emitted by the laser is projected onto the wavelength converter is the center of the excitation point, and the first focus of the front section is located at the center of the excitation point. Part of the laser beam emitted by the laser is excited by the wavelength converter to become an excitation beam. The excitation beam and the unexcited laser beam are combined to form a synthetic white light. Most of the synthetic white light is collected by the front section of the reflective cup and focused on the second focus of the front section. A small part of the synthetic white light is collected by the rear section of the reflective cup and focused on the second focus of the rear section. The first focus of the rear section is located at the light emitting center of the LED light source. Most of the light beam emitted by the LED light source is collected by the rear section of the reflective cup and focused on the second focus of the rear section. A high- and low-beam conversion baffle is provided near the second focus of the front section, and the high- and low-beam conversion baffle is moved into or out of the position of the second focus of the front section to switch between high and low beam lighting: when the low beam of the headlight is turned on, the high- and low-beam conversion baffle is moved into the position of the second focus of the front section to block most of the synthetic white light. At this time, only the light beam emitted by the LED light source and a small part of the synthetic white light are emitted from the lens at the same time to achieve low beam lighting; when the high beam of the headlight is turned on, the high- and low-beam conversion baffle is moved out of the position of the second focus of the front section without blocking the synthetic white light. At this time, the light beam emitted by the LED light source and the synthetic white light are emitted from the lens at the same time to achieve high beam lighting.

2. The automobile headlamp according to claim 1, characterized in that: The headlight substrate is divided into a front part, a middle part and a rear part along the light emitting direction of the laser, wherein the laser is installed at the front part of the headlight substrate, and the light beam emitted by the laser passes through the middle part and the rear part in sequence, and an inclined surface is provided between the middle part and the rear part, and the wavelength converter is provided on the inclined surface.

3. The automobile headlamp according to claim 2, characterized in that: An included angle is formed between an extension line of the bottom surface of the headlamp substrate and the inclined surface, and the included angle ranges from 30° to 60°.

4. The automobile headlamp according to claim 2, characterized in that: The middle portion of the headlamp substrate is recessed inwards.

5. The automobile headlamp according to claim 1, characterized in that: The headlamp substrate is made of metal, and a radiator is installed on at least one side of the headlamp substrate. The radiator dissipates heat for the laser and the LED light source through the headlamp substrate.

6. The automobile headlamp according to claim 2, characterized in that: The LED light source is arranged behind the wavelength converter and is closely attached to the wavelength converter.

7. The automobile headlamp according to claim 2, characterized in that: The LED light source is arranged before the wavelength converter and is closely attached to the wavelength converter.

8. The automobile headlamp according to claim 1, characterized in that: The front section second focus and the rear section second focus are located on the same focal plane.

9. The automobile headlamp according to claim 1, characterized in that: The optical axis position of the synthetic white light emerging from the lens is lower than the optical axis position of the LED light beam emerging from the lens.

10. The automobile headlamp according to claim 1, characterized in that: The synthetic white light passes through the lens to form a small-angle illumination beam, and the LED light beam passes through the lens to form a large-angle illumination beam.

11. The automobile headlamp according to claim 6 or 7, characterized in that: The light beams emitted by the LED light source and the laser are emitted from the lower half of the lens.

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