CN106838754A - Vehicle lighting system and driving method thereof - Google Patents

Abstract

The invention provides a vehicle lamp lighting system and a driving method thereof, comprising a laser, an aperture device and a fluorescent device; the laser is used for emitting excitation light; the aperture device includes an aperture and a driving assembly, and the aperture It includes an opaque area and a plurality of light-transmitting areas of different shapes. The drive assembly switches the corresponding light-transmitting area of the diaphragm to the outgoing light path of the excitation light according to the driver's lighting requirements, so as to pass through the The light-transmitting area shapes the beam section of the excitation light into a corresponding shape; the phosphor powder on the fluorescent device produces fluorescence of a corresponding shape under the irradiation of the shaped excitation light, and the shape is correspondingly shaped by the fluorescence. The shape is illuminated with white light. The car light lighting system is relatively easy to implement and has low cost.

Description

Vehicle lighting system and driving method thereof

technical field

The present invention relates to the field of optical technology, more specifically, to a vehicle lamp lighting system and a driving method thereof.

Background technique

Compared with traditional light sources, laser light sources have obvious advantages in lighting effect, energy saving and volume. Therefore, laser light sources have gradually replaced traditional light sources in the field of automotive lighting. Existing vehicle lighting systems using laser light sources usually use excitation light emitted by lasers to excite phosphors to generate fluorescence, and then form white light for illumination through fluorescence.

Because the driver needs to turn on different lighting modes of the car lights when driving a car on different occasions, such as low beam, high beam and fog light lighting modes, etc., and the low beam lighting pattern requires a certain light and dark boundary, and will not give The driver of the car coming from the opposite side brings visual discomfort, and the high beam lighting requires a long irradiation distance and beam collimation. Therefore, the lighting system of the car lights needs to control the lights to produce different lighting patterns to meet the needs of drivers in different occasions. lighting needs.

An existing vehicle lighting system includes a plurality of lasers to form a laser array, and realizes a specific lighting pattern by controlling the lasers arranged in a specific pattern to be turned on at the same time. higher cost. Another gas lamp lighting system includes a plurality of light guide devices with specific cross-sections, each light guide device has a corresponding laser, and the corresponding light guide device is controlled to emit a specific lighting pattern by controlling the opening of the corresponding laser. Similarly, The cost of the system is also higher. There is also a vehicle lighting system that includes a plurality of phosphor devices of different shapes. Specific lighting patterns are realized by controlling lasers to irradiate different phosphor devices. Similarly, the structure of this system is relatively complicated and the cost is high.

Contents of the invention

In view of this, the present invention provides a vehicle lamp lighting system and its driving method to solve the problem of high cost of the vehicle lamp lighting system in the prior art that can realize the free switching of vehicle lamps in different occasions.

To achieve the above object, the present invention provides the following technical solutions:

A vehicle lighting system, including a laser, an aperture device and a fluorescent device;

The laser is used to emit excitation light;

The diaphragm device includes a diaphragm and a driving assembly, the diaphragm includes an opaque area and a plurality of light-transmitting areas of different shapes, and the driving assembly controls the corresponding light-transmitting area of the diaphragm according to the lighting requirements of the driver. The area is switched to the outgoing optical path of the excitation light, so as to shape the beam section of the excitation light into a corresponding shape through the light-transmitting area;

The fluorescent powder on the fluorescent device generates fluorescent light of a corresponding shape under the irradiation of the shaped excitation light, and the white light for illumination of a corresponding shape is shaped by the fluorescent light.

Preferably, the aperture is a circular plate-shaped structure, and the driving assembly realizes switching of light-transmitting regions of different shapes by driving the aperture to rotate around the central axis;

Alternatively, the aperture is a square plate-like structure, and the driving assembly realizes switching of light-transmitting regions of different shapes by driving the aperture to translate.

Preferably, when the aperture is in the shape of a circular plate, the drive assembly is a stepper motor; when the aperture is in the shape of a square plate, the drive assembly is a slide rail or a shape memory alloy.

Preferably, a first lens is provided between the laser and the aperture device, a second lens is provided between the aperture device and the fluorescent device, and the first lens and the second lens are used to process light collimation.

Preferably, the phosphor device includes phosphor powder and a substrate, the phosphor powder is disposed on the substrate, and the substrate is used to support the phosphor powder and dissipate heat from the phosphor powder.

Preferably, the vehicle light lighting system further includes a reflective cup arranged above the fluorescent device, the reflective cup is used to transmit the excitation light and reflect the fluorescent light generated by the fluorescent device and the unabsorbed excitation light to The fluorescent light and the unabsorbed excitation light are emitted in parallel, wherein the fluorescent powder is located at the focal point of the reflective cup.

Preferably, the excitation light is blue light, and the fluorescence is yellow light; or, the excitation light is ultraviolet light, and the fluorescence and blue light and yellow light.

Preferably, when the excitation light is blue light, the region of the reflective cup corresponding to the incident position of the blue light has a through hole, so that the blue light is incident into the interior of the reflective cup through the through hole.

Preferably, when the excitation light is ultraviolet light, the reflective cup is made of a material that transmits ultraviolet light and reflects visible light.

A driving method of a vehicle lighting system, applied to the vehicle lighting system according to any one of the above, the driving method includes:

Receive the lighting demand command input by the driver;

According to the lighting demand instruction, the corresponding light-transmitting area of the diaphragm is switched to the outgoing light path of the excitation light, so that the light-transmitting area can shape the beam section of the excitation light into a corresponding shape, and pass the shaping The fluorescent light excited by the excitation light comes into shape corresponding to the shape of the white light used for illumination.

Compared with the prior art, the technical solution provided by the present invention has the following advantages:

In the vehicle lamp lighting system and its driving method provided by the present invention, the light transmission areas of different shapes on the diaphragm are switched to the outgoing light path of the excitation light through the driving assembly, and the beam cross section of the excitation light is shaped into a corresponding shape through the light transmission area. Shape, to obtain a lighting pattern suitable for lighting modes such as low beam or high beam, this kind of car lighting system is easier to implement and the cost is lower.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a structural schematic diagram of a vehicle lighting system provided by an embodiment of the present invention;

Fig. 2 is a schematic plan view of a diaphragm provided by an embodiment of the present invention;

FIG. 3 is a schematic plan view of another diaphragm provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of a low beam lighting pattern provided by an embodiment of the present invention;

FIG. 5 is a schematic plan view of another diaphragm provided by an embodiment of the present invention;

Fig. 6 is a flow chart of a method for driving a vehicle lighting system according to another embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a vehicle lighting system, which is an adaptive laser light source lighting system suitable for vehicle lighting. Referring to FIG. 1 , the vehicle lighting system includes a laser 1 and an aperture device 2 and fluorescent device 3 .

Certainly, in this embodiment, the vehicle lighting system may also include the first lens 4 between the laser 1 and the aperture device 2, the second lens 5 between the aperture device 2 and the fluorescent device 3, and the phosphor powder Reflector cup 6 above disc 3. Wherein, the first lens 4 and the second lens 5 are used to collimate the light. The reflective cup 6 is used to transmit the excitation light emitted by the laser 1 to reflect the fluorescence generated by the fluorescent device 3 and the reflected non-absorbed excitation light, so that the fluorescence and the non-absorbed excitation light are emitted in parallel.

In this embodiment, the laser 1 is used to emit excitation light. Optionally, the excitation light is blue laser light or ultraviolet light. When the excitation light is blue light, the area corresponding to the incident position of the blue light on the reflective cup 6 has a through hole, that is, the blue light is transmitted to the fluorescent powder of the fluorescent device 3 inside the reflective cup 6 through the through hole. The fluorescent powder on it is a yellow fluorescent powder, and the yellow light excited by the yellow fluorescent powder is mixed with the unabsorbed blue light to form white light for illumination. When the excitation light is ultraviolet light, the reflective cup 6 is made of a material that transmits ultraviolet light and reflects visible light, that is, the ultraviolet light can pass through the reflective cup 6 and irradiate on the fluorescent powder of the fluorescent device 3 inside the reflective cup 6. The fluorescent powder on the fluorescent device 3 is a mixed powder of blue fluorescent powder and yellow fluorescent powder, and the yellow light and blue light excited by the mixed powder are mixed to form white light for illumination. Certainly, the fluorescent powder is not limited to yellow fluorescent powder, and may be red, green and other colored fluorescent powders, as long as the mixed light that can be excited and emitted is white light. In addition, the reflective plate can be made of the material that the excited light is incident on and the area corresponding to the reflective cup of the reflective cup transmits the excited light, and the other areas reflect the film. The transmitted excitation light can be made of a light-transmitting material or have holes, which is not limited here.

The aperture device 2 includes an aperture 20 and a driving assembly 21 . Referring to FIG. 2 , FIG. 2 is a schematic plan view of the diaphragm 20 . The aperture 20 is a circular plate-shaped structure, and the driving assembly 21 realizes switching of different shapes of light-transmitting regions by driving the aperture 20 to rotate around the central axis. The aperture 20 includes an opaque area 20a and a plurality of differently shaped light-transmitting areas, including an L-shaped light-transmitting area 20b and a square-shaped light-transmitting area 20c. Therefore, the beam cross-section of the exciting light passing through the light-transmitting region 20b will be shaped into an L-shape suitable for low-beam lights, and the beam cross-section of the exciting light passing through the light-transmitting region 20c will be shaped into a square shape suitable for high-beam lights. . Of course, in other embodiments, the aperture 20 can also include other shapes of light-transmitting regions. As shown in FIG. The light area 20c may also be a regular polygon or a circle, and the present invention is not limited thereto.

In this embodiment, the excitation light passes through the light-transmitting area 20b on the diaphragm 20 to generate the lighting pattern of the low beam headlight. The lighting pattern is shown in FIG. The driver of the vehicle coming from the left front can be freed from the influence of the headlights, which can improve driving safety. As for the occasion of using the high beam, since the lights generally do not have specific lighting pattern restrictions, therefore, in this embodiment, the excitation light can pass through the square light-transmitting area 20c on the diaphragm 20 to form the high beam lighting.

Since the light-transmitting regions 20b and 20c will transmit the excitation light, the light-impermeable region 20a will reflect or absorb the excitation light, and the reflection or absorption of the excitation light by the light-impermeable region 20a will lose part of the excitation light incident on the diaphragm 20 , therefore, the shape of the light-transmitting region can be designed to be only slightly smaller than the beam cross-section of the excitation light incident on the aperture 20, which can ensure that the beam of the excitation light is shaped into a beam cross-section of a specific shape, and can also ensure that the beam cross-section of the excitation light The light effect is not greatly weakened.

In this embodiment, the driving mode of the diaphragm 20 is rotary, at this time, the driving component 21 may be a stepping motor. Specifically, the driving assembly 21 is located in the opaque area 20a of the diaphragm 20 of the flat structure. Referring to FIG. On the way, the beam section of the excitation light can be shaped into a corresponding shape by passing through the light-transmitting region.

For example, when the driver needs to turn on the low beam headlights, the drive assembly 21 rotates the light-transmitting area 20b to the optical path of the exciting light by driving the diaphragm 20 to rotate around the central axis, so that the light-transmitting area 20b turns the light beam of the exciting light The cross-section is shaped into a lighting pattern suitable for low beams; when the driver needs to turn on the high beams, the drive assembly 21 turns the light-transmitting area 20c onto the optical path of the exciting light, so that the light-transmitting area 20c shapes the beam section of the exciting light into a lighting pattern suitable for high beams.

Of course, the present invention is not limited thereto. In other embodiments, as shown in FIG. 5 , the diaphragm 20 can also be a square plate-shaped structure, and the driving assembly 21 can realize different light transmission areas by driving the diaphragm 20 to translate up and down. At this time, the driving assembly 21 can be a slide rail or a shape memory alloy.

In this embodiment, the phosphor device 3 includes phosphor powder 30 and a substrate 31 . The phosphor powder 30 is arranged on the substrate 31, and the phosphor powder 30 generates fluorescence of a corresponding shape under the irradiation of the shaped excitation light, and the fluorescence and the excitation light not absorbed by the phosphor powder are mixed into white light for illumination, optional Yes, the excitation light in this embodiment is blue light, and the fluorescence is yellow light. The substrate 31 is used to support the phosphor powder 30 and dissipate heat from the phosphor powder 30 . Under the excitation of the excitation light, the temperature of the phosphor powder 30 is likely to be too high to cause thermal quenching, and the thermal quenching will reduce the life of the phosphor powder 30. Therefore, the substrate 31 in this embodiment needs to have better heat conduction and heat dissipation effects , so as to control the temperature of the phosphor powder 30 not to exceed a critical value.

In this embodiment, the blue excitation light emitted by the blue laser 1 passes through the first lens 4 and then enters the aperture 20. According to the shape of the light-transmitting area of the aperture 20, the beam cross section of the excitation light can be shaped into a corresponding shape. Afterwards, the shaped excitation light beam passes through the second lens 5 and then enters the phosphor powder 30 on the substrate 31 , so that the phosphor powder 30 is excited to generate yellow fluorescence. Because phosphor powder 30 is not 100% for the absorptivity of excitation light, so there will be part of excitation light that can not be absorbed by phosphor powder 30, but is emitted from phosphor powder 30 surface together with fluorescence after being scattered by phosphor powder 30, and this part excitation light is about It accounts for 10%-15% of the total energy of the excitation light, and then the yellow fluorescence is mixed with the blue excitation light not absorbed by the phosphor powder 30 to form white light for illumination. The white light is incident on the reflective cup 6. Therefore, the reflective cup 6 can reflect the white light in the form of parallel light.

Since fluorescence itself is decoherent light, part of the excitation light that is not absorbed by the phosphor is scattered by the surface of the phosphor 30 and the coherence is greatly eliminated. Therefore, the speckle effect of the final emitted white light can be effectively reduced, and the brightness of the car lamp can be improved. Lighting effects and visual safety.

The vehicle light lighting system provided in this embodiment switches the light-transmitting areas of different shapes on the diaphragm to the outgoing light path of the excitation light through the driving assembly, and adjusts the beam cross section of the excitation light into a corresponding shape through the light-transmitting area to obtain A lighting pattern suitable for lighting modes such as low beam or high beam, this kind of car lighting system is relatively easy to implement and the cost is low.

Another embodiment of the present invention also provides a driving method for a vehicle lighting system, which is applied to the vehicle lighting system disclosed in any of the above embodiments. The flow chart of the driving method is shown in FIG. 6 , including:

S601: Receive a lighting demand command input by the driver;

When the driver needs to turn on the low beam headlights, the driver inputs a corresponding low beam lighting demand command to the drive assembly 21, so that the drive assembly 21 turns the light-transmitting area 20b on the aperture 20 to the light path of the exciting light, forming a corresponding low beam lighting pattern; when the driver needs to turn on the high beam, the driver inputs the corresponding high beam lighting demand command to the driving assembly 21, so that the driving assembly 21 turns the light-transmitting area 20c on the diaphragm 20 to the excitation light On the light path, a corresponding high beam lighting pattern is formed. Specifically, the driver can input lighting demand instructions by toggling the operating lever or pressing the button.

S602: Switch the corresponding light-transmitting area of the aperture to the outgoing light path of the excitation light according to the lighting demand command, so that the light-transmitting area can shape the beam section of the excitation light into a corresponding shape, and pass through the Fluorescence excited by the shaped excitation light is shaped to correspond to the shape of white light for illumination.

After the driver inputs the lighting demand command, the driving component 21 switches the corresponding light-transmitting area of the diaphragm 20 to the outgoing light path of the excitation light according to the lighting demand command, so that the light-transmitting area can shape the beam cross section of the excitation light into the corresponding shape, and form the white light for illumination of the corresponding shape through the fluorescence excited by the shaped excitation light.

For example, the drive assembly 21 switches the light-transmitting area 20b on the diaphragm 20 to the outgoing light path of the excitation light according to the instruction of low-beam lighting, and the light-transmitting area 20b will shape the cross-section of the excitation light beam into an L-shape, and the shaped beam When the excitation light with an L-shaped cross section is irradiated on the phosphor powder 30, it will excite fluorescence and the emitted fluorescence forms an L-shaped illumination pattern, and the yellow fluorescence is mixed with the unabsorbed blue excitation light to form a correspondingly shaped illumination pattern. white light.

In the driving method of the vehicle lighting system provided in this embodiment, the light transmission areas of different shapes on the diaphragm are switched to the outgoing light path of the excitation light through the driving component, and the beam cross section of the excitation light is shaped into a corresponding shape through the light transmission area. , to obtain lighting patterns suitable for lighting modes such as low beam or high beam, this kind of vehicle lighting system is easier to implement and has a lower cost.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A vehicle lighting system, characterized in that it comprises a laser, an aperture device and a fluorescent device; The laser is used to emit excitation light; The diaphragm device includes a diaphragm and a driving assembly, the diaphragm includes an opaque area and a plurality of light-transmitting areas of different shapes, and the driving assembly controls the corresponding light-transmitting area of the diaphragm according to the lighting requirements of the driver. The area is switched to the outgoing optical path of the excitation light, so as to shape the beam section of the excitation light into a corresponding shape through the light-transmitting area; The fluorescent powder on the fluorescent device generates fluorescent light of a corresponding shape under the irradiation of the shaped excitation light, and the white light for illumination of a corresponding shape is shaped by the fluorescent light. 2. The lighting system according to claim 1, wherein the aperture is a circular plate-shaped structure, and the drive assembly realizes the different shapes of light-transmitting regions by driving the aperture to rotate around the central axis. switch; Alternatively, the aperture is a square plate-like structure, and the driving assembly realizes switching of light-transmitting regions of different shapes by driving the aperture to translate. 3. The lighting system according to claim 2, characterized in that, when the aperture is a circular plate-shaped structure, the drive assembly is a stepper motor; when the aperture is a square plate-shaped structure, The drive assembly is a slide rail or a shape memory alloy. 4. The illumination system according to claim 1, wherein a first lens is provided between the laser and the aperture device, and a second lens is provided between the aperture device and the fluorescent device, so The first lens and the second lens are used to collimate the light. 5. The lighting system according to claim 1, wherein the phosphor device comprises phosphor powder and a substrate, the phosphor powder is arranged on the substrate, the substrate is used to support the phosphor powder, and The fluorescent powder dissipates heat. 6. The lighting system according to claim 5, characterized in that, the vehicle lighting system further comprises a reflective cup arranged above the fluorescent device, the reflective cup is used to transmit the excitation light and reflect the fluorescent light The fluorescent light and the non-absorbed excitation light generated by the device make the fluorescent light and the non-absorbed excitation light exit in parallel, wherein the fluorescent powder is located at the focal point of the reflective cup. 7. The lighting system according to any one of claims 1-6, characterized in that, the excitation light is blue light, and the fluorescence is yellow light; or, the excitation light is ultraviolet light, and the fluorescence and blue light and yellow light. 8. The lighting system according to claim 7, wherein when the excitation light is blue light, the area of the reflective cup corresponding to the incident position of the blue light has a through hole, so that the blue light can pass through the The through hole is incident into the interior of the reflective cup. 9. The lighting system according to claim 7, wherein when the excitation light is ultraviolet light, the reflective cup is made of a material that transmits ultraviolet light and reflects visible light. 10. A driving method for a vehicle lighting system, characterized in that it is applied to the vehicle lighting system according to any one of claims 1 to 9, the driving method comprising: Receive the lighting demand command input by the driver; According to the lighting demand instruction, the corresponding light-transmitting area of the diaphragm is switched to the outgoing light path of the excitation light, so that the light-transmitting area can shape the beam section of the excitation light into a corresponding shape, and pass the shaping The fluorescent light excited by the excitation light comes into shape corresponding to the shape of the white light used for illumination.