CN111457314A - Novel automobile lighting optical system based on double-free-form-surface lens group - Google Patents
Novel automobile lighting optical system based on double-free-form-surface lens group Download PDFInfo
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- CN111457314A CN111457314A CN202010222561.1A CN202010222561A CN111457314A CN 111457314 A CN111457314 A CN 111457314A CN 202010222561 A CN202010222561 A CN 202010222561A CN 111457314 A CN111457314 A CN 111457314A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
- F21S41/265—Composite lenses; Lenses with a patch-like shape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
- F21W2102/10—Arrangement or contour of the emitted light
- F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
- F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
- F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention discloses a novel automobile lighting optical system based on double free-form surface lens groups, which mainly comprises a far-near light L ED light source, a far-near light TIR lens, a near-near light TIR lens, an improved parallel light barrier and a double free-form surface lens, wherein the TIR lens and the double free-form surface lens form a chromatic aberration correction and achromatic lens group, and a far-near L ED light source images light emitted by the L ED light source on a receiving surface through the processes of collimating the light and eliminating chromatic aberration of dispersion.
Description
Technical Field
The invention relates to the technical field of automobile lighting, in particular to a novel automobile lighting optical system based on a double-free-form-surface lens group.
Background
The automobile dipped headlight is an indispensable lighting lamp on an automobile, a common dipped headlight adopts a halogen lamp or L ED as a light source to be placed at the focus of an elliptical reflecting cup, in order to form a light and shade cut-off line, a light barrier is arranged at the other focus of the elliptical reflecting cup, and the light emitted by the light source is omnibearing, so the loss of a large amount of light can be caused by the light barrier, in order to ensure the lighting intensity, the power of the light source has to be increased to compensate the loss, which is not beneficial to the national policy of energy saving and emission reduction.
Disclosure of Invention
The invention aims to solve the problems of low light efficiency utilization rate, chromatic dispersion in an illumination area and the like in a dipped headlight module in the current market, and provides a novel automobile illumination double-free-form-surface lens group optical system. In addition, the double-free-form-surface lens is used in the system, and the double-free-form-surface lens and the TIR lens form a free-form-surface lens group, so that light can be corrected, the mapping relation between the light-emitting angle of the light and a target plane is more accurate, and the color temperature of an automobile lamp illumination area is stable due to effectively less dispersion.
The technical scheme of the invention is as follows:
the invention relates to a novel automobile lighting optical system based on a double-free-form-surface lens group, which comprises a low-beam L ED chip, a high-beam L ED chip, a low-beam TIR lens, a high-beam TIR lens, an improved parallel baffle and a double-free-form-surface lens, wherein the low-beam TIR lens and the high-beam TIR lens respectively form a chromatic aberration correction and achromatic lens group together with the double-free-form-surface lens, and the light emitted by a high-beam L ED chip is collimated and eliminated through the lens group formed by the TIR lens and the double-free-form-surface lens, so that the light emitted by a L ED light source is imaged.
The optical system of the invention uses for reference the traditional projection type automobile headlamp module, because the inner wall of the reflector cup in the traditional module adopts an elliptical structure, and the light source is arranged at the elliptical focus in the reflector plate, the light beam reflected by the reflector cup can be converged to the other focus of the ellipse, the focus is provided with an improved light barrier, the light barrier is positioned below the axis where the two focuses are positioned, the light barrier can shield the lower half part of the light beam, only the upper half part of the light beam can be irradiated to a distant place, the front of the light barrier is provided with a lens, and the cross section shape is projected on a receiving surface. Therefore, the system of the invention refers to the position of the reflector in the projection type module for the position placement of the TIR lens group, finely adjusts the emergent angle of far and near light rays on the basis, defines the intersection point of the light rays and the axis as the focal point of the TIR lens group, then places the section of the baffle on the focal point, and simultaneously, the intersection point is also the focal point of the double-free-form-surface lens. The double-free-form-surface lens group has the function of correcting light, so that the illumination requirement of the car lamp is met, and a light and shade cut-off line can appear in the irradiation area of the light, so that the color of the illumination area is uniform, and the color temperature is stable. This car passing light lighting components can assemble the light beam that the light source sent, avoids the loss of light beam, guarantees sufficient illumination luminance, reduces the chromatic dispersion.
The optical elements of the optical system of the invention from L ED direction to the receiving surface are respectively arranged as a low-beam TIR lens, a high-beam TIR lens, a parallel baffle plate and a double free-form surface lens.
Furthermore, the surfaces of the lens are all free-form surfaces.
Furthermore, the inner side of the near-light TIR lens is a refraction surface, the lateral surface of the outer side is a reflection surface, and the end surface of the outer side is a refraction surface.
Further, the low-beam TIR lens is an integral body formed by 7 TIR lens units through cutting and sewing processing.
Furthermore, the inner sides of the high beam TIR lenses are all refractive surfaces, the lateral surfaces of the outer sides are reflective surfaces, and the end surfaces of the outer sides are refractive surfaces.
Further, the high beam TIR lens is an integral body formed by 5 TIR lens units through cutting and sewing processing.
Further, the parallel baffles are arranged in parallel, and the surface coating is made of a reflecting material.
Further, the parallel baffle cut-off line plane is used to modify the low beam pattern to meet regulatory requirements.
Furthermore, the parallel baffle is subjected to cutting processing according to design requirements, and is used for ensuring that light rays are not blocked when the high beam is opened.
Furthermore, the image side surface of the double-free-form-surface lens is a convex surface, and the object side surface of the double-free-form-surface lens is a convex surface. Two surfaces of the lens are free-form surfaces, and each free-form surface can flexibly correct light rays, so that illumination light spots are more uniform, and the appearance of the curved surface is more smooth.
Further, the constituent materials of the lens are all PMMA.
Furthermore, a TIR lens and a double-free-form-surface lens are adopted to form a phase difference correcting and achromatic lens group, and an air space is reserved between the lenses.
The L ED light source emits light rays towards the lens component;
the L ED light source chip is fixed in size;
the L ED light sources comprise low beam light sources and high beam light sources;
when the dipped headlight is used for illumination, the dipped headlight L ED is controlled to be turned on, the high beam L ED is controlled to be turned off, the corresponding light emitting surface is lightened and the brightness is adjusted according to the regulation requirement, and when the high beam is used for illumination, the dipped headlight is controlled to be turned on simultaneously, and the brightness is adjusted according to the regulation requirement.
The invention has the beneficial effects that:
1. the novel optical system module collects light rays through the TIR lens and converges the light rays, so that the utilization rate of the light rays is ensured.
2. The invention corrects the light through the lens group formed by the TIR lens and the double-free-form-surface lens, thereby effectively eliminating chromatic aberration and enabling the illumination light spots to be more uniform.
3. The invention solves the technical problems of complex system composition, large volume and high cost in the prior art.
4. The optical system is a multi-purpose system, the size of a chip is not changed, a lens group does not need to be changed, and development cost is reduced.
5. The invention can obviously improve the light efficiency utilization rate in the application of the car lamp, can realize clear cut-off line of light and shade, can match the national standard regulation and realize the regulation requirement.
Drawings
FIG. 1 is a schematic diagram of an optical system according to the present invention;
FIG. 2 is a schematic diagram of a low-beam TIR lens assembly in accordance with the present invention;
FIG. 3 is a schematic diagram of the structure of a high beam TIR lens assembly according to the present invention;
FIG. 4 is a schematic diagram of the operation of the TIR lens unit of the present invention;
FIG. 5 is a schematic diagram of the operation of a low-beam TIR lens assembly of the present invention;
FIG. 6 is a schematic diagram of the operation of the high beam TIR lens assembly of the present invention;
FIG. 7 is a schematic view of a parallel baffle structure according to the present invention;
FIG. 8 is a schematic view of a dual free-form lens configuration of the present invention;
FIG. 9 is a schematic view of the low beam lighting of the present invention;
FIG. 10 is a schematic view of the high beam lighting of the present invention;
the labels in the figure are:
1-low beam L ED light source, 2-high beam L ED light source, 3-low beam TIR lens, 4-high beam TIR lens, 5-improved parallel baffle, 6-double free-form surface lens
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, which is a schematic structural diagram of the present invention, a novel automotive lighting optical system based on a double-free-form-surface lens group is composed of a low-beam L ED light source 1, a high-beam L ED light source 2, a low-beam TIR lens 3, a high-beam TIR lens 4, an improved parallel light barrier 5, and a double-free-form-surface lens 6.
Fig. 2 is a schematic diagram of the low-beam TIR lens structure of the present invention, which is formed by cutting and stitching 7 TIR lens units.
Fig. 3 is a schematic diagram of the far-beam TIR lens structure of the present invention, which is formed by cutting and stitching 5 TIR lens units.
Fig. 4 is a schematic diagram of the TIR lens unit of the present invention.
In the process of transmitting light by the TIR lens, a part of the light is emitted in parallel by using the principle of total reflection.
Since the TIR lens is rotationally symmetric, it is sufficient to analyze only its upper half, and the boundary MN divides the light emitted from point O into two parts. When the light is refracted to the inside of the inner hole side wall ac part, the light reaching the outer contour curve ab of the TIR lens is totally reflected and emitted in parallel due to the inner structure of the light.
The light refracted to the inside from the central part cd of the inner hole is mainly emitted in parallel by utilizing the imaging principle of the aspheric lens, so that the central light intensity is increased, and the utilization rate of the light is effectively improved.
Finally, the two parts of light rays are emitted in parallel at the light emitting surface of the TIR lens and are collimated light rays.
Fig. 5 is a schematic diagram showing the operation of the low-beam TIR lens assembly of the present invention.
The near-light TIR lens working system defines the Z-axis direction as the optical axis direction, the TIR lens group is positioned above the optical axis and forms an included angle of 30 degrees with the optical axis direction, the L ED light source is positioned at the focus of the internal structure of the TIR lens unit, the emitted light beams can be fully utilized, the divergence angle of the L ED chip is 120 degrees, the L ED light emitting characteristic is Lambert distribution, 5L ED particles form the light source group, and the single light on-off can be controlled.
The L ED light source emits a light beam, which is refracted inside and totally reflected outside the near light TIR lens group, and then collimated and emitted to intersect with the optical axis at a point, namely the point is the internal focus of the system.
The baffle is horizontally placed at the focus position of the system, and the section of the baffle is positioned at the focus.
When the L ED light source light beam passes through the focus, part of light is blocked by the line-dividing surface intercepted by the light barrier, and the unblocked part of light enters the double-free-form-surface lens after passing through the focus.
The L ED light source emits light beams which reach the double-free-form-surface lens, because the refractive indexes of the light beams with different colors are different, the light beams can be deflected when being transmitted in the same medium, when the light beams pass through the incident surface of the double-free-form-surface lens and reach the emergent surface of the lens, the double free-form surfaces can correct the light beams according to the correction ratio calculated during design, the light beams of the emergent light beams are converged, the dispersion is inhibited, the color temperature of light spots is stable, and the cut-off lines are clear.
Fig. 6 is a schematic diagram showing the operation of the low-beam TIR lens set of the present invention.
The high beam TIR lens working system is positioned below an optical axis, the TIR lens group forms an included angle of 20 degrees with the optical axis direction, the L ED light source is positioned at the focus of the internal structure of the TIR lens unit, light beams emitted by the L ED light source can be fully utilized, the divergence angle of the L ED chip is 120 degrees, 5L ED particles form the light source group, and the single particle is controllable in on and off.
The L ED light source emits light beams which are refracted inside and totally reflected outside the high beam TIR lens group and then collimated and emitted to the position of the baffle.
The baffle is horizontally placed at the focus position of the system, and the section of the baffle is positioned at the focus.
When the L ED light source light beam passes through the focal point, the light beam can be cut off at the right side of the cutoff line of the light barrier, and the unblocked part of the light enters the double-free-form-surface lens.
The L ED light source emits light beams which reach the double-free-form-surface lens, because the refractive indexes of the light beams with different colors are different, the light beams can be deflected when being transmitted in the same medium, when the light beams pass through the incident surface of the double-free-form-surface lens and reach the emergent surface of the lens, the double free-form surfaces can correct the light beams according to the correction ratio calculated during design, the light beams of the emergent light beams are converged, the dispersion is inhibited, and the color temperature of light spots is stable.
Fig. 7 is a schematic view of the baffle structure of the present invention.
The parallel baffle reflecting plane is used for filtering part of stray light.
And the parallel baffle plates shear and remove a part of the structure on the right side of the intersection point, and are used for preventing the high beam light from being shielded when the high beam light is lighted.
The parallel baffles form a cut-off line plane at the cut-off for forming a low beam light pattern that complies with regulations.
As shown in fig. 8, two surfaces of the lens are free-form surfaces, the first free-form surface is an incident surface and replaces an incident plane in the single free-form surface, the second free-form surface is an emergent surface, the parallel baffle is placed at a system focus, the lens is placed in front of the baffle, light emitted by the chip is emitted from the system focus after the light is condensed by the TIR lens, stray light is blocked due to the action of the baffle, the condensed light is incident on the illumination surface after being corrected by the lens, and each free-form surface can flexibly correct light, so that illumination spots are more uniform, and the appearance of the curved surface is smoother. According to the distribution requirement of the illuminance value of the dipped headlight of the automobile lamp in national standard, the light-emitting angles of chips with a plurality of large angles are set, a horizontal line and a light-dark cut-off line which is upward at the right side of the horizontal line are generated on an illuminating surface, an approximately semi-elliptical illuminating area is generated below the cut-off line, the illuminating area is divided into rings, the illuminance value in the ring area is set, the mapping relation between the light-emitting angle of the light reflected by a reflecting cup and a target illuminating surface is calculated, the correction angle of the light can be obtained according to the mapping relation, the angle correction ratio of a first free curved surface and a second free curved surface is preset, the respective correction angle of the first free curved surface and the second free curved surface can be determined according to the angle correction ratio, the emergent light of the two free curved surfaces can be determined, the point on the first free curved surface is calculated by using an iterative calculation formula, the point on the first free curved surface is, and then calculating points on the second free curved surface by using an iterative formula, and introducing the points on the two curved surfaces into three-dimensional software to obtain a lens entity. The double-free-form-surface lens can enable the color temperature of transmitted light to be stable, light spots to be uniform, cut-off lines to be clear, and the chromatic dispersion phenomenon is avoided.
The L ED light source emits light rays towards the lens component;
the L ED light sources are all single L ED chips, and the brightness of the chips can be controlled.
Specifically, when the low beam lamp is turned on, as shown in fig. 9, regulations require that the light-emitting surface at the illumination position emits light, so as to realize the light shape of the low beam lamp; when the high beam is turned on, as shown in fig. 10, regulations require that the light-emitting surface at the illumination position emits light, so as to realize the light shape of the high beam.
The above-listed series of detailed descriptions are merely specific illustrations of possible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent means or modifications that do not depart from the technical spirit of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A novel automobile lighting optical system based on a double-free-form-surface lens group is characterized by comprising a low-beam L ED chip (1), a high-beam L ED chip (2), a low-beam TIR lens (3), a high-beam TIR lens (4), an improved parallel baffle (5) and a double-free-form-surface lens (6), wherein the low-beam TIR lens (3) and the high-beam TIR lens (4) respectively form a chromatic aberration correcting and achromatic lens group with the double-free-form-surface lens (6), the improved baffle (5) is located between the high-beam TIR lens and the double-free-form-surface lens (6), light emitted by the high-beam L ED chip passes through the lens group consisting of the two TIR lenses and the double-free-form-surface lens, and the light sequentially passes through the processes of light collimation and chromatic aberration elimination, so as to image light emitted by a L.
2. The novel automobile lighting optical system based on the double-free-form-surface lens group as claimed in claim 1, wherein the low-beam L ED chip (1) comprises 7L ED particles, each L ED particle is 2mm long and 1.5mm wide, the light emitting angle is 120 degrees, the low-beam L ED chip is placed on a PCB, a needle-shaped heat dissipation device is arranged at the rear of the PCB, and the light emitted by the low-beam L ED chip is directed towards the lens group.
3. The novel automobile lighting optical system based on the double-free-form-surface lens group as claimed in claim 1, wherein the high beam L ED chip (2) comprises 5 particles L ED particles, each L ED particle is 2mm long and 1.5mm wide, the light emitting angle is 120 degrees, the high beam L ED chip is placed on the PCB, the rear portion of the PCB is provided with a needle-shaped heat sink, and the light emitted by the high beam L ED chip is directed towards the lens group.
4. The novel automobile illumination optical system based on the double-free-form-surface lens group as claimed in claim 1, wherein the low-beam TIR lens (3) is an integrated element, and is formed by splicing 7 TIR lens units through cutting and stitching; each TIR lens unit has an inner diameter of 3mm, an outer diameter of 10mm, an inner height of 4mm and an outer height of 10mm, and is made of PMMA and has a refractive index of 1.492.
5. The novel automobile lighting optical system based on the double-free-form-surface lens group as claimed in claim 1, wherein the high-beam TIR lens (4) is an integrated component, and is formed by splicing 5 TIR lens units by cutting and stitching; each TIR lens unit has an inner diameter of 4mm, an outer diameter of 12mm, an inner height of 5mm and an outer height of 10mm, and is made of PMMA and has a refractive index of 1.492.
6. The optical system of claim 4 or 5, wherein the TIR lens unit is a collimating lens, and comprises an inner structure and an outer structure, the inner structure refracts light to refract light emitted from the L ED chip to the outer structure, the outer structure totally reflects light, the L ED chip light reaches the outer curved surface after being internally refracted by the TIR lens unit, and the outer curved surface reflects light according to total reflection to form collimated light.
7. The novel automobile lighting optical system based on the double-free-form-surface lens group as claimed in claim 1, characterized in that the improved parallel baffle (5) is a reflecting material light barrier, and the "Z" -shaped section of the improved parallel baffle (5) is located at the focal point of the double-free-form-surface lens (6).
8. The novel automobile lighting optical system based on the double-free-form-surface lens group as claimed in claim 1, wherein the double-free-form-surface lens (6) is concave-convex in shape, the first free-form surface is concave towards the inside of the lens to form an incident surface, the second free-form surface is convex towards the outside to form an exit surface, the diameter of the exit surface is 70mm, the focal length of the exit surface is 45mm, and the center thickness of the exit surface is 12.16 mm. The two free-form surfaces participate in light correction, so that the mapping relation between the light-emitting angle of light emitted by the focus and the target plane is more accurate, no stray light exists, the cut-off line is clearer, and no dispersion phenomenon exists.
9. The novel automobile lighting optical system based on double-free-form-surface lens group as claimed in claim 1, wherein there is an air space in the optical system, wherein the air space between the near-beam TIR lens (3), the far-beam TIR lens (4) and the Z-shaped section of the parallel baffle (5) is 45mm, and the air space between the Z-shaped section of the parallel baffle (5) and the double-free-form-surface lens (6) is 45 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010222561.1A CN111457314A (en) | 2020-03-26 | 2020-03-26 | Novel automobile lighting optical system based on double-free-form-surface lens group |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010222561.1A CN111457314A (en) | 2020-03-26 | 2020-03-26 | Novel automobile lighting optical system based on double-free-form-surface lens group |
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| CN111457314A true CN111457314A (en) | 2020-07-28 |
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| CN202010222561.1A Pending CN111457314A (en) | 2020-03-26 | 2020-03-26 | Novel automobile lighting optical system based on double-free-form-surface lens group |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203202741U (en) * | 2013-04-19 | 2013-09-18 | 无锡实益达电子有限公司 | Narrow light beam LED illumination optical system |
| US20130242585A1 (en) * | 2012-03-13 | 2013-09-19 | Automotive Lighting Reutlingen Gmbh | Light module of a lighting device of a motor vehicle |
| WO2015014062A1 (en) * | 2013-07-31 | 2015-02-05 | 华南理工大学 | Free-form surface micro lens array for led headlamp of automobile |
| US20190360657A1 (en) * | 2016-11-24 | 2019-11-28 | Zkw Group Gmbh | Headlight Module for Vehicles |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20130242585A1 (en) * | 2012-03-13 | 2013-09-19 | Automotive Lighting Reutlingen Gmbh | Light module of a lighting device of a motor vehicle |
| CN203202741U (en) * | 2013-04-19 | 2013-09-18 | 无锡实益达电子有限公司 | Narrow light beam LED illumination optical system |
| WO2015014062A1 (en) * | 2013-07-31 | 2015-02-05 | 华南理工大学 | Free-form surface micro lens array for led headlamp of automobile |
| US20190360657A1 (en) * | 2016-11-24 | 2019-11-28 | Zkw Group Gmbh | Headlight Module for Vehicles |
Non-Patent Citations (2)
| Title |
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| 王宣淇: "基于ADB汽车前照灯的光学系统研究与设计", 《中国优秀硕士学位论文全文数据库》 * |
| 罗蝶: "双自由曲面LED汽车前照灯光学系统研究", 《中国优秀硕士学位论文全文数据库》 * |
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Application publication date: 20200728 |