CN110822366B

CN110822366B - A car headlight

Info

Publication number: CN110822366B
Application number: CN201911229806.7A
Authority: CN
Inventors: 黄成�; 李虎; 李秀斌; 陈国平
Original assignee: Guangzhou Guanglian Electronic Technology Co ltd
Current assignee: Guangzhou Guanglian Electronic Technology Co ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2025-08-05
Anticipated expiration: 2039-12-04
Also published as: WO2021109241A1; CN110822366A

Abstract

The invention discloses an automobile headlamp which comprises a headlamp substrate, a laser, an LED light source, a reflecting cup, a wavelength converter and a lens, wherein the laser and the LED light source are arranged on the headlamp substrate, the laser emits laser, the laser sequentially passes through the wavelength converter, the reflecting cup and the lens and then emits, a light beam emitted by the LED light source sequentially passes through the reflecting cup and the lens and then emits, a dipped headlight of the headlamp is turned on, only the LED light source emits light, or the LED light source and a small part of laser emit light simultaneously, a high beam of the headlamp is turned on, and the LED light source and the laser emit light simultaneously. The invention skillfully combines the laser light source and the LED light source, effectively utilizes the advantages of high luminous flux of the LED light source and long-distance range of the laser light source, and realizes better far-near light illumination effect.

Description

Automobile headlamp

Technical Field

The invention relates to the technical field of automobile illumination, in particular to an automobile headlamp.

Background

The automobile headlight, also called as an automobile headlight, is used as an eye of an automobile, not only relates to the external image of the whole automobile, but also has a close relation with safe driving under the weather condition of driving at night or low visibility, and the high-quality automobile headlight is beneficial to improving driving safety and reducing accident rate.

The conventional automotive headlight is designed and used by using a halogen lamp, a xenon lamp, etc., and is gradually applied to an automotive lamp with the continuous development of LED technology. Compared with the prior art, the LED bulb has the advantages of long service life of about 300 hours, high power consumption, long driving delay, high efficiency, less extra loss, small size, convenient application, high shock resistance and the like, and is widely popularized and used in main stream consumer vehicle types in the market at present.

The semiconductor laser has the advantages of high response speed, low brightness attenuation, small volume, low energy consumption, long service life and the like of the LED light source, and is further based on the advantages of the LED light source. For example, the length of a single laser diode can be 10 μm, which is only 1% of that of a conventional LED component, so that the size of the automobile headlamp can be greatly reduced, and a larger degree of freedom is provided for the design of the appearance of a future automobile. Secondly, the energy consumption of the laser is low, when the same required illumination condition is met, the energy consumption of the laser headlight is only 60% of that of the LED headlight, so that the energy consumption is further reduced, and the energy conservation and environmental protection trend of future automobiles is met. And the laser has the characteristic strong directivity, so that the irradiation distance of the laser head lamp is longer, a driver can earlier make a prognosis on the road condition in front, and the running safety of the automobile is improved. Meanwhile, the laser light source is closer to an ideal point light source, and an ideal design effect is easier to obtain when the optical light distribution design is carried out. Therefore, with the forward development of technology, the laser frying lamp is more widely used, and the current trend of replacing the xenon lamp by the LED is presented.

However, in practical applications, since a large area illumination is required for a road surface having a relatively large distance when a headlight of an automobile is low-beam illuminated, a high luminous flux is required for light output, and thus the advantage of the ultra-long effective distance of the laser itself is not suitable for such a case.

Disclosure of Invention

The invention aims to overcome at least one defect of the prior art, and provides the automobile headlamp, which has more reasonable design and better illumination effect by adopting the combination scheme that the LED light source is used for low beam and the laser light source is used for high beam.

The technical scheme adopted by the invention is as follows:

the automobile headlamp comprises a headlamp substrate, a laser, an LED light source, a reflecting cup, a wavelength converter and a lens, wherein the laser and the LED light source are arranged on the headlamp substrate, the laser emits laser, the laser sequentially passes through the wavelength converter, the reflecting cup and the lens and then emits, the light beam emitted by the LED light source sequentially passes through the reflecting cup and the lens and then emits, the dipped headlight of the headlamp is turned on, only the LED light source emits from the lens, or the LED light source and a small part of laser simultaneously emit from the lens, the high beam of the headlamp is turned on, and the LED light source and the laser simultaneously emit from the lens.

In the technical scheme, the LED light source can perform large-area illumination at a short distance, and the laser light source has the advantage of long-distance illumination, so that the technical scheme skillfully utilizes the combination of the laser light source and the LED light source, and can realize better automobile illumination effect. The laser is mainly responsible for the high beam illumination of the vehicle headlight, while the LED light source is mainly responsible for the low beam illumination of the vehicle headlight. The low beam light of the headlamp is turned on, the light emitting beams are all emitted by the LED light source, or the light emitting beams are mainly emitted by the LED light source and mix the light emitted by part of the laser light sources, the high beam light of the headlamp is turned on, the light emitting beams are the mixed light of the light emitting beams of the LED light source and the laser light source, and the lighting effect is better.

And the high-low beam variable shifting sheet is arranged between the reflecting cup and the lens, can move in and out in the light path, and realizes switching of high beam illumination and low beam illumination.

In the technical scheme, the low beam or high beam illumination is switched by designing the high beam and low beam switching sheet to move in or out of the light path and selectively blocking or non-blocking the light beam emitted by the laser. The high beam of the headlamp is opened, the high beam and low beam change shift sheet moves out of the light path, and the light beams of the laser and the LED light source are emitted simultaneously, so that high beam illumination is realized.

In addition, the technical scheme is not limited to a mode of switching far and near light illumination through the far and near light change shift sheet, and can be other modes capable of realizing far and near light illumination. For example, the high beam illumination may be realized by controlling the manner of simultaneously lighting the LED light source and the laser when the high beam is turned on, and the low beam illumination may be realized by controlling the manner of lighting only the LED light source when the low beam is turned on.

Further, the front lamp 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 arranged at the front part of the front lamp substrate, the light beam emitted by the laser sequentially passes through the middle part and the rear part, an inclined plane is arranged between the middle part and the rear part, and the wavelength converter is arranged on the inclined plane.

Further, an included angle is formed between the extended line of the bottom surface of the headlamp substrate and the inclined plane, and the included angle ranges from 30 degrees to 60 degrees.

Further, the middle part of the headlamp substrate is concavely arranged inwards.

Further, the laser emits a laser beam with a first wavelength, the laser beam with the first wavelength irradiates the wavelength conversion device, part of the laser beam is converted into an excitation beam, and the excitation beam and the unconverted laser beam with the first wavelength are combined into a synthesized white light to be emitted.

Further, the head lamp substrate is made of metal, and a heat sink is mounted at least at one side of the head lamp substrate, and dissipates heat from the laser and the LED light source through the head lamp substrate.

In this technical scheme, head-light base plate and radiator are closely adjacent, and laser instrument and LED light source set up on the head-light base plate, can conduct the heat that laser instrument and LED light source produced to the radiator fast through this kind of arrangement structure to reach good radiating effect.

Further, the LED light source is disposed behind and in close proximity to the wavelength converter.

Further, as another embodiment, the LED light source is disposed in front of and in close proximity to the wavelength converter.

In the above structure, the LED light source is disposed between the laser and the wavelength converter, and the laser beam emitted from the laser passes through the upper surface of the LED light source and irradiates the wavelength converter, and the wavelength converter is stimulated to emit an excitation beam. The LED light beams emitted by the LED light sources and the excitation light beams meet and are staggered.

The LED light source comprises a wavelength converter, a light reflecting cup and a Light Emitting Diode (LED) light source, wherein the light reflecting cup is arranged above the wavelength converter and the LED light source, the light reflecting cup comprises a front section and a rear section, radians of longitudinal sections of the front section and the rear section are different, and the front section and the rear section are spliced in a seamless mode.

The longitudinal section is a straight section along the focal point connecting line of the reflecting cup, the LED light beam and the excitation light beam are projected on reflecting cups with different radians of the longitudinal section, collected by the reflecting cups with different radians of the longitudinal section and focused on different focal distances, and the reflecting cups with different radians of the longitudinal section have different focal distances.

The front section of the reflecting cup is provided with a front section first focus and a front section second focus, the rear section of the reflecting cup is provided with a rear section first focus and a rear section second focus, the position of a laser beam emitted by the laser is the center of an excitation point, the front section first focus is positioned 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, the excitation beam and the laser beam which is not excited are combined to form composite white light, the composite white light is mostly collected by the front section of the reflecting cup and focused on the front section second focus, the rear section first focus is positioned on the luminous center of the LED light source, the light beam emitted by the LED light source is mostly collected by the rear section of the reflecting cup and focused on the rear section second focus, a far-near light shift sheet is arranged near the front section second focus, the far-near light shift sheet is moved into the position of the front section second focus, the far-near light shift sheet is fully or partially combined to form the white light, the far-near light shift sheet is not moved into the position of the front section second focus, and the far-near light shift position is not shifted out of the front section by the far-light shift position.

Further, the anterior segment second focal point and the posterior segment second focal point are located on the same focal plane.

Further, the combined white light focused at the front second focus partially coincides with the LED beam focused at the rear second focus.

Further, the position of the optical axis of the synthesized white light emitted from the lens is lower than the position of the optical axis of the LED light beam emitted from the lens.

Further, the resultant white light passes through the lens to form a small angle illumination beam, and the LED beam passes through the lens to form a large angle illumination beam.

According to the technical scheme, the far-near light change shifting sheet moves into or out of the front section second focal position from the lower part of the headlamp to achieve far-near illumination, namely, when the far-near light change shifting sheet moves out of the front section second focal position, the small-angle synthesized white light and the large-angle LED light beams directly pass through the lens to form the far-light illumination, when the far-near light change shifting sheet moves into the front section second focal position, the blocking sheet can block the passing light beams, only the light beams above the blocking sheet pass through, namely, the LED light beams form the low-beam illumination through the lens, or the LED light beams and a small part of the synthesized white light form the low-beam illumination through the lens.

Further, a small portion of the light beam emitted by the LED light source is collected by the front section of the reflector cup and focused on the second focal point of the front section, and/or a small portion of the synthesized white light is collected by the rear section of the reflector cup and focused on the second focal point of the rear section.

The LED light beams are mostly focused on the second focal point of the rear section to form the low beam illumination with larger light spots, the LED light beams are also mostly focused on the second focal point of the front section and are blocked during low beam illumination, the LED light beams assist in high beam illumination during high beam illumination, the excitation light beams are mostly focused on the second focal point of the front section and blocked during low beam illumination, and the excitation light beams are also mostly focused on the second focal point of the rear section and assist in low beam illumination during low beam illumination. When the high beam is used for illumination, the excitation light beam and the LED light beam jointly emit light, so that a better illumination effect is realized.

Further, the light beams emitted by the LED light source and the laser are emitted from the lower half part of the lens.

Further, 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.

The LED light source comprises a light source, a wavelength converter, a laser, a light reflecting cup, an LED light source, a lower light reflecting cup, an upper light reflecting cup and a lower light reflecting cup, wherein the light reflecting cup is arranged above the LED light source, the lower light reflecting cup is arranged below the wavelength converter, light beams emitted by the laser are projected after being reflected by the wavelength converter and the light reflecting cup in sequence, and light beams emitted by the LED light source are emitted after being reflected by the light reflecting cup.

Further, the cambered surface of the reflecting cup is a part of the ellipsoidal curved surface, and the ellipsoidal focal lengths corresponding to the upper reflecting cup and the lower reflecting cup are different; the upper reflector cup is provided with a first upper focus and a second upper focus, the lower reflector cup is provided with a first lower focus and a second lower focus, the first upper focus is positioned at the light emitting center of the LED light source, most of light beams emitted by the LED light source are collected by the upper reflector cup and focused at the second upper focus, the light beams emitted by the laser are projected at the position of the wavelength converter to be the center of an excitation point, the first lower focus is positioned at the center of the excitation point, part of laser light beams emitted by the laser are excited by the wavelength converter to become excitation light beams, the excitation light beams and the laser light beams which are not excited are combined to form composite white light, the composite white light is collected by the lower reflector cup and focused at the second lower focus, a far-near light shift sheet is arranged near the position of the second lower focus, the far-near light shift sheet is moved into the position of the second lower focus to shield all or part of the composite white light, the position of the second lower focus is not shielded, the far-near light shift sheet is moved into the position of the second lower focus, and the far-near light shift sheet is realized by moving into or out of the second lower focus.

Further, the second upper focus and the second lower focus are on the same focal plane, and the focal plane is perpendicular to the emergent light optical axis of the headlamp.

The light beam emitted by the LED light source is focused above the focal plane through the reflecting cup and is projected on the lower half part of the lens to be emitted.

Compared with the prior art, the invention has the beneficial effects that:

The invention skillfully combines the laser light source and the LED light source, effectively utilizes the advantages of high luminous flux of the LED light source and long-distance range of the laser light source, and achieves better far-near light illumination effect by only emitting light from the LED light source or emitting light from the LED light source and a small part of the laser light source when the dipped headlight is started and simultaneously emitting light from the LED light source and the laser light source when the far-light is started.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1.

Fig. 2 is a schematic diagram illustrating the installation of the laser light source and the LED light source according to embodiment 1.

Fig. 3 is a schematic view of a reflective cup after mixing the laser and LED of example 1.

Fig. 4 is a schematic diagram of the high beam state of the automotive headlamp with the laser and LED mixed in example 1.

Fig. 5 is a diagram showing the low beam state of the automobile headlight in which the laser and the LED are mixed in example 1.

Fig. 6 is a schematic view of the optical path of a laser light source of the automotive headlamp of example 2.

Fig. 7 is a schematic view of the light path of an LED light source of the automotive headlamp of example 2.

Fig. 8 is a schematic diagram of the high beam state of the hybrid vehicle headlamp of the laser light source and LED light source of example 2.

Fig. 9 is a diagram showing a low beam state of the hybrid automobile headlamp of the laser light source and the LED light source of example 2.

Fig. 10 is a schematic diagram of a hybrid optical path between a laser and an LED light source for an automotive headlamp according to example 3.

Fig. 11 is a schematic diagram showing the far-reaching status of a hybrid automotive headlamp with a laser light source and an LED light source according to example 3.

Fig. 12 is a diagram showing a low beam state of a hybrid vehicle headlamp of example 3 laser light source and LED light source.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the invention. For better illustration of the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and not represent the actual product size, and it will be understood by those skilled in the art that some well-known structures in the drawings and their descriptions may be omitted.

Example 1

As shown in fig. 1 and 2, an automotive headlamp comprises a headlamp substrate 100, a laser 200, an LED light source 400, a reflector cup 500, a wavelength converter 300 and a lens 700, wherein the laser 200 and the LED light source 400 are mounted on the headlamp substrate 100, a light beam 201 emitted from the laser 200 sequentially passes through the wavelength converter 300, the reflector cup 500 and the lens 700 and then exits, and a light beam emitted from the LED light source 400 sequentially passes through the reflector cup 500 and the lens 700 and then exits.

The high-low beam variable shifting sheet 800 is arranged between the reflecting cup 500 and the lens 700, and the high-low beam variable shifting sheet 800 is designed to move in or out of a light path to selectively block or not block all or part of light beams emitted by the laser 200, so as to realize switching of low beam or high beam illumination.

The high beam of the headlight is turned on, the high beam and low beam shift sheet 800 moves out of the light path without shielding the light beams, so that the light beams of the laser 200 and the LED light source 400 are emitted simultaneously, and high beam illumination is realized.

The front lamp substrate 100 is divided into a front part, a middle part and a rear part along the light emitting direction of the laser 200, the laser 200 is mounted at the front part of the front lamp substrate 100, the light beam emitted by the laser 200 sequentially passes through the middle part and the rear part, the middle part is in a concave trapezoid structure, an inclined plane is arranged between the middle part and the rear part, and the wavelength converter 300 is arranged on the inclined plane.

As shown in fig. 2, an included angle θ is formed between the extended line of the bottom surface of the headlamp substrate 100 and the inclined plane, and the included angle θ ranges from 30 ° to 60 °.

The laser 200 emits a laser beam with a first wavelength, the laser beam with the first wavelength irradiates on the wavelength conversion device 300 to be partially converted into the excitation beam 202, and the excitation beam 202 and the unconverted laser beam with the first wavelength are combined to emit white light.

As shown in fig. 1, the head lamp substrate 100 is made of metal, and a heat sink 900 is mounted at least at one side of the head lamp substrate 100, and the heat sink 900 radiates heat to the laser 200 and the LED light source 400 through the head lamp substrate 100.

In this technical scheme, the headlight substrate 100 is closely adjacent to the radiator 900, and the laser 200 and the LED light source 400 are disposed on the headlight substrate 100, so that the heat generated by the laser 200 and the LED light source 400 can be quickly conducted to the radiator 900 by such a disposition structure, so as to achieve a good heat dissipation effect.

Wherein the LED light source 400 is disposed behind the wavelength converter 300 and in close proximity to the wavelength converter 300. The wavelength converter 300 is disposed on an inclined plane of the trapezoid, and the LED light source 400 is disposed on the top of the trapezoid.

As shown in fig. 3, the light reflecting cup 500 is disposed 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 light reflecting cup 500 in sequence and then projected, and the light beam emitted by the LED light source 400 is reflected by the light reflecting cup 500 and then emitted.

The reflector cup 500 comprises a front section 501 and a rear section 502, wherein the radians of the longitudinal sections of the front section 501 and the rear section 502 are different, and the front section 501 and the rear section 502 are spliced in a seamless mode.

The cambered surface of the reflecting cup 500 is a part of an ellipsoidal curved surface, focal lengths of ellipsoids corresponding to the front section 501 and the rear section 502 of the reflecting cup 500 are different, and ellipsoids where the curved surfaces of the front section 501 and the rear section 502 of the reflecting cup 500 are located are two ellipsoids with different long and short axes. The front section 501 of the reflector cup 500 has a front section first focus and a front section second focus 600, and the rear section 502 of the reflector cup 500 has a rear section first focus and a rear section second focus (not shown). The front section second focus 600 and the rear section second focus are located on the same focal plane and are adjacently disposed. The light rays at the front section second focus 600 and the rear section second focus position at least partially coincide.

In this embodiment, a part 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 and the unexcited laser beam 201 are combined to become white light, most of the combined white light is collected by the front section 501 of the reflector cup 500 and focused on the front section second focal point 600, the light beam emitted by the LED light source 400 is projected on the reflector cup 500, most of the light beam is collected by the rear section 502 of the reflector cup 500 and focused on the rear section second focal point (not shown in the figure), the LED light beam and the combined white light are combined at the front section second focal point 600 and the rear section second focal point, the combined light beam propagates through the lens 700, and the lens 700 projects the light beam in front of the automobile.

The distance-near light shift sheet 800 moves into the focal position corresponding to the excitation light beam 202, and blocks all or part of the synthesized white light, so as to realize low beam illumination, and the distance-near light shift sheet 800 moves out of the focal position corresponding to the excitation light beam 202, and does not block the synthesized white light, so as to realize the distance illumination.

The light beam emitted by the laser 200 is projected onto the wavelength converter 300 to form an excitation point center, the excitation point center is positioned on the first focal point of the front section, a part of the laser light beam 201 emitted by the laser 200 is excited by the wavelength converter 300 to form an excitation light beam 202, the excitation light beam 202 and the un-excited laser light beam 201 are combined to form a combined white light, the combined white light is mostly collected by the front section 501 of the reflector cup 500 and focused on the second focal point 600 of the front section, the light emitting center of the LED light source 400 is positioned on the first focal point of the rear section, the light beam emitted by the LED light source 400 is mostly collected by the rear section 502 of the reflector cup 500 and focused on the second focal point of the rear section, a far-near light shift sheet 800 is arranged near the second focal point 600 of the front section, the far-near light shift sheet 800 moves into the second focal point 600 of the front section to shield all or part of the combined white light, the far-near light is realized, the far-near light shift sheet moves out of the second focal point 600 of the combined white light, the combined white light is not shielded, the far-near light is realized, and the far-near light is shifted into the second focal point 800 by the far-near light shift.

Wherein the combined white light focused at the front-stage second focus 600 and the LED beam focused at the rear-stage second focus partially coincide.

Wherein the position of the optical axis of the synthesized white light emitted from the lens 700 is lower than the position of the optical axis of the LED beam emitted from the lens 700.

Wherein the resultant white light passes through the lens 700 to form a small-angle illumination beam, and the LED light passes through the lens 700 to form a large-angle illumination beam.

As shown in fig. 4 and 5, when the distance and near light variable shifting sheet 800 moves out of the front stage second focal point 600 position, the combined white light of a small angle and the LED light beam of a larger angle directly form the distance light illumination through the lens 700, whereas when the distance and near light variable shifting sheet 800 moves into the front stage second focal point 600 position, the distance and near light variable shifting sheet 800 blocks the passing light beam, and only the light beam above the distance and near light variable shifting sheet 800 passes, that is, the LED light beam forms the low beam illumination through the lens 700, or the LED light beam and a small part of the combined white light form the low beam illumination through the lens 700.

Wherein a small portion of the light beam emitted from the LED light source 400 is collected by the front section 501 of the reflector cup 500 and focused at the front section second focal point 600, and a small portion of the resultant white light is collected by the rear section 502 of the reflector cup 500 and focused at the rear section second focal point.

The LED light beams are mostly focused on the second focal point of the rear section to form the low beam illumination with larger light spots, and the LED light beams are also mostly focused on the second focal point 600 of the front section and are blocked during low beam illumination, the LED light beams are used for assisting the high beam illumination during high beam illumination, the synthetic white light is mostly focused on the second focal point 600 of the front section and blocked during low beam illumination, and the synthetic white light is also mostly focused on the second focal point of the rear section and is used for assisting the low beam illumination during low beam illumination. During high beam illumination, the synthesized white light and the LED light beam jointly emit light, so that a better illumination effect is realized.

Wherein the light beam emitted from the LED light source 400 and the laser 200 is emitted from the lower half of the lens 700.

Example 2

As shown in fig. 6 to 9, the difference between the present embodiment and embodiment 1 is that the LED light source 400 is disposed in front of the wavelength converter 300 and is closely adjacent to the wavelength converter 300. The wavelength converter 300 is disposed on an inclined plane of the trapezoid, and the LED light source 400 is disposed at the bottom of the trapezoid.

In this embodiment, the LED light source 400 is disposed between the laser 200 and the wavelength converter 300, and 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, so that the wavelength converter 300 is stimulated to emit the excitation beam 202. The LED light beams emitted by the LED light source 400 and the excitation light beam 202 meet and are staggered.

A small part of the light beam emitted by the LED light source 400 is focused by the front section 501 of the reflector cup 500 at the position of the front section second focal point 600 of the reflector cup 500 to form a smaller light spot, and a large part of the light beam is focused by the rear section 502 of the reflector cup 500 at the position of the rear section second focal point to form a larger light spot. The focused LED light is projected to the front through the lens 700 to form high beam and low beam illumination, i.e. the light forming smaller light spot at the front second focal point 600 is responsible for the normal high beam illumination of the automotive headlamp, while the light forming larger light spot forms the low beam illumination of the automotive headlamp.

The laser 200 emits a beam close to a point light source, the beam is guided to the wavelength conversion device, the beam irradiates the wavelength conversion device with a smaller spot size, and part of the laser is absorbed by the wavelength conversion device and converted into excitation light. Most of the excitation light beam 202 emitted by the wavelength conversion device is collected by the front section 501 of the reflecting cup 500 and focused on the position of the second focal point 600 of the front section to form a light spot with smaller size, and the focused excitation light is responsible for auxiliary high beam illumination with a longer distance from the automobile headlamp after passing through the lens 700.

The distance/near light shift sheet 800 can be moved into or out of the position near the front section second focus 600 to achieve the illumination change of the distance/near light. That is, when the distance/near light variable shift 800 moves out of the light path of the front second focal point 600, the light beam emitted by the laser and the LED light beam directly pass through the lens 700 to form the distance light illumination, that is, all the light beams directly pass through the lens 700 to form the distance light illumination, when the distance/near light variable shift 800 moves into the light path of the front second focal point 600, the distance/near light variable shift 800 can shield the passing light beam, only the light beam above the distance/near light variable shift 800 passes through, that is, the LED light beam passes through the lens 700 to form the low beam illumination, or the LED light beam and a small part of the synthesized white light pass through the lens 700 to form the low beam illumination.

Example 3

As shown in fig. 10 to 12, the difference between this embodiment and embodiment 1 is that the headlight substrate 100 is divided into an upper side and a lower side, the trapezoid structure, the laser 200 and the wavelength converter 300 are respectively disposed on the lower side of the headlight substrate 100, and the LED light source 400 is disposed on the upper side of the headlight substrate 100.

The light reflecting cup 500 is divided into an upper light reflecting cup and a lower light reflecting cup, the upper light reflecting cup is arranged above the LED light source 400, the lower light reflecting cup is arranged below the wavelength converter 300, the light beams emitted by the laser 200 are projected after being reflected by the wavelength converter 300 and the light reflecting cup 500 in sequence, and the light beams emitted by the LED light source 400 are emitted after being reflected by the light reflecting cup 500.

The cambered surfaces of the reflector cup 500 are part of ellipsoidal cambered surfaces, the ellipsoidal focal lengths corresponding to the upper reflector cup and the lower reflector cup are different, the upper reflector cup is provided with a first upper focal point and a second upper focal point 601, the lower reflector cup is provided with a first lower focal point and a second lower focal point (not shown in the figure), the luminous center of the LED light source 400 is positioned at the first upper focal point, most of light beams emitted by the LED light source 400 are collected by a rear section 502 of the reflector cup 500 and focused on the second upper focal point 601, the position of the light beam emitted by the laser 200, which is projected on the wavelength converter 300, is an excitation point center, the center of the excitation point is positioned at the first lower focal point, part of the laser light beam emitted by the laser 200 is excited by the wavelength converter 300 to become an excitation light beam 202, the excitation light beam 202 and the un-excited laser light beam 201 are combined into white light, most of the composite white light is collected by the lower reflector cup and focused on the second lower focal point, a far-near light shielding piece 800 is arranged near-far-near light shielding piece is arranged near light, the far-near light shielding piece 800 is moved into or out of the second focal point, the far-near light is not completely shifted into or out of the second focal point, and the far-near light is completely shifted into or out of the position by the second focal point is changed into the far-far light.

The second upper focal point 601 and the second lower focal point are on the same focal plane, and the focal plane is perpendicular to the light-emitting optical axis of the headlamp.

The synthesized white light is focused below the focal plane through the reflector cup 500 and projected to the upper half of the lens 700 for emitting, and the LED light beam is focused above the focal plane through the reflector cup 500 and projected to the lower half of the lens 700 for emitting.

The second upper focal point 601 of the upper reflecting cup and the second lower focal point of the lower reflecting cup form the same focal plane perpendicular to the optical axis of the headlamp, and the LED light focused by the upper reflecting cup is positioned above the excitation light focused by the lower reflecting cup, so that the focused LED emits light and the excitation light is projected to the front through the lens 700 to achieve the lighting effect. The LED light above the focal plane is projected through the lens 700 to the lower side of the illumination place in front of the vehicle running, and the excitation light is above the illumination place, so that the LED beam is formed to be more favorable for low beam illumination, and the excitation light is more favorable for long distance illumination.

The design advantage fully utilizes laser as an ideal light source, and can make the angle of light beam illumination narrower so as to achieve better illumination effect.

It should be understood that the foregoing examples of the present invention are merely illustrative of the present invention and are not intended to limit the present invention to the specific embodiments thereof. Any modification, equivalent replacement, improvement, etc. that comes within the spirit and principle of the claims of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An automotive 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 sequentially passes through the wavelength converter, the reflector, and the lens before being emitted. The light beam emitted by the LED light source sequentially passes through the reflector and the lens 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 is characterized in that the headlamp 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 headlamp 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.

3. The automobile headlamp according to claim 2, wherein 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°.

4. The automobile headlamp according to claim 2, wherein a middle portion of the headlamp substrate is recessed inward.

5. The automobile headlamp according to claim 1, wherein 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 from the laser and the LED light source through the headlamp substrate.

6. The automobile headlamp according to claim 2, wherein the LED light source is arranged after the wavelength converter and is closely attached to the wavelength converter.

7. The automobile headlamp according to claim 2, wherein 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 , wherein the front second focus and the rear second focus are located on the same focal plane.

9. The automobile headlamp according to claim 1, wherein an optical axis position of the synthetic white light emitted from the lens is lower than an optical axis position of the LED light beam emitted from the lens.

10. The automobile headlamp according to claim 1, wherein 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.