CN109539167A - A kind of vehicle front lighting headlight system - Google Patents
A kind of vehicle front lighting headlight system Download PDFInfo
- Publication number
- CN109539167A CN109539167A CN201811430779.5A CN201811430779A CN109539167A CN 109539167 A CN109539167 A CN 109539167A CN 201811430779 A CN201811430779 A CN 201811430779A CN 109539167 A CN109539167 A CN 109539167A
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- Prior art keywords
- curved sections
- cup
- cup body
- reflecting
- curved
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- 238000004020 luminiscence type Methods 0.000 claims abstract description 42
- 238000009434 installation Methods 0.000 claims description 3
- 238000005286 illumination Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000011514 reflex Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
-
- 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
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/36—Combinations of two or more separate reflectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/40—Cooling of lighting devices
- F21S45/42—Forced cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
- F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The present invention relates to a kind of vehicle front lighting headlight systems.The present invention includes lens, luminescence chip and the reflective half cup with light source cooperation, the cup body medial surface of reflective half cup is the reflecting surface cooperated with light source, reflecting surface includes the first reflecting curved surface and the second reflecting curved surface, and the first reflecting curved surface is close to rim of a cup, and the second reflecting curved surface is close to bottom of a cup；First reflecting curved surface includes along curved sections A1, the curved sections B and curved sections A2 for sequentially forming and smoothly transitting perpendicular to cup body axial direction, and the second reflecting curved surface includes along curved sections C1, curved sections D and the curved sections C2 for sequentially forming and smoothly transitting perpendicular to cup body axial direction；Curved sections A1 and curved sections A2 curvature are all α 1, and curved sections B curvature is that α 2, curved sections C1 and curved sections C2 curvature are all α 3, and curved sections D curvature is α 4, wherein 2 < α of α, 1 < α, 4 < α 3.The system effectively increases the light line width of vehicle front lighting headlight, and light illumination also all greatly improves.
Description
Technical field
The invention belongs to car light technical fields, are specifically related to a kind of vehicle front lighting headlight system.
Background technique
Patent document CN205245025U discloses a kind of high efficiency LED single-chip distance-light all-in-one car headlight
The problem of optical system, the big lamp optical system of the vehicle front lighting exists in actual use, has: emergent ray narrower width,
It can be only formed the range of exposures of 60 degree of angles, so that there are lighting blind zones in turning for automobile, this drives to night and brings peace
Full hidden danger；In addition emergent ray height is lower, and the guideboard letter positioned at high level by road can not be seen clearly by leading to driver often
Breath.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of vehicle front lighting headlight systems.Reflective half cup in the system
Cooperation light source effectively increases the light line width of vehicle front lighting headlight after, and light illumination also all greatly improves.
In order to achieve the object of the present invention, the invention adopts the following technical scheme:
A kind of vehicle front lighting headlight system, it is described anti-including lens, luminescence chip and the reflective half cup cooperated with light source
The cup body medial surface of light half cup is the reflecting surface cooperated with light source, and the reflecting surface includes the first reflecting curved surface and the second reflection
Curved surface, wherein the first reflecting curved surface is close to rim of a cup, the second reflecting curved surface is close to bottom of a cup；First reflecting curved surface includes along vertical
It is bent in curved sections A1, the curved sections B and curved sections A2, second reflection that cup body axial direction sequentially forms and smoothly transits
Face includes along curved sections C1, curved sections D and the curved sections C2 for sequentially forming and smoothly transitting perpendicular to cup body axial direction；Institute
It states curved sections A1 and curved sections A2 is arranged symmetrically in the two sides of curved sections B and curvature is all α 1, the curvature of the curved sections B is α
2, the curved sections C1 and curved sections C2 are arranged symmetrically in the two sides of curved sections D and curvature is all α 3, the curvature of the curved sections D
For α 4, wherein 2 < α of α, 1 < α, 4 < α 3.
Further technical solution: the curved sections B exists in the orthographic projection length of cup body radially with the first reflecting curved surface
The ratio of the orthographic projection length of cup body radially is equal to curved sections D and reflects song with second in the orthographic projection length of cup body radially
The ratio of orthographic projection length of the face in cup body radially.
Further technical solution: orthographic projection length of the cup body internal reflection surface in cup body axial direction is L1, wherein
Orthographic projection length of first reflecting curved surface in cup body axial direction is 5L1/ 7, second reflecting curved surface in cup body axial direction just
Projected length is 2L1/7。
Further technical solution: first reflecting curved surface is L in the orthographic projection length of cup body radially2, the song
Face section A1, curved sections A2 are respectively 3.5L in the orthographic projection length of cup body radially2/ 16, the curved sections B cup body radially
Orthographic projection length be 9L2/16。
Further technical solution: the system further includes radiator, and the radiator top is for installing described shine
The positioning table of chip, the positioning edge of table, which is equipped with, is located at the fixed station right above luminescence chip for the reflective half cup；Institute
State positioning table include close to bottom of a cup and for install the first luminescence chip horizontal location section and close to rim of a cup and be used for install
The sloped position section of second luminescence chip, the gradient of the sloped position section are 30 degree.
Further technical solution: the arc notch for increasing cup body intensity is equipped at the rim of a cup of the reflective half cup.
Further technical solution: the distance between first luminescence chip and rim of a cup L3, second luminescence chip
The distance between rim of a cup is L4, orthographic projection length of the cup body internal reflection surface in cup body axial direction is L1, wherein L3With L1
Ratio be 0.8-0.9, L4With L1Ratio be 0.2-0.3.
Further technical solution: the system further includes sleeve, and the lens are connected in sleeve one end, and the radiator is solid
Due to the sleeve other end, the radiator is connected with the solenoid valve for carrying out distance-light adjusting in the position screw in front of car light
Light-blocking mechanism.
Further technical solution: the radiator bottom is equipped with fan.
The beneficial effects of the present invention are:
(1) cup body internal reflection surface is arranged to curved sections under the precondition that light type meets laws and regulations requirement by the present invention
A1, curved sections B, curved sections A2, curved sections C1, curved sections D and curved sections C2, and by the setting of amount of curvature, realize vapour
Vehicle headlight emergent ray is wider, and can form the range of exposures of 90 degree of angle width, solves automobile and exists in turning
The problem of lighting blind zone, substantially increases the safety of night driving；The present invention can make going out for vehicle front lighting headlight simultaneously
It is higher to penetrate light, the higher position of road can be irradiated to, facilitates driver to see the guideboard letter positioned at road high level clearly with this
Breath etc., further ensures traffic safety, also improves the comfort of driving.
(2) present invention passes through the ratio to the first reflecting curved surface, the second reflecting curved surface, curved sections A1, curved sections B, curved surface
Section A2 ratio, curved sections C1, curved sections D, curved sections C2 ratio be in optimized selection, improve emergent ray width, height
While spending, the illumination of vehicle front lighting headlight emergent ray is also further improved, illumination of the present invention reaches 180lux, that is, is emitted
Light luminance is higher, and in addition the light efficiency of lamp source also reaches 82% or more.
(3) arc notch at the rim of a cup of reflective half cup of the present invention has the function of increasing cup body intensity.
(4) the first luminescence chip of the present invention can form distance-light, and second luminescence chip has light filling function
I.e. on the basis of the first luminescence chip is formed by emergent ray, cooperate the reflex of reflective half cup that can effectively increase out
Penetrate the height of light, it is ensured that sight is wider on the run at night by driver.In addition radiator of the present invention is sent out first
Optical chip, the second luminescence chip have heat sinking function, and cooperation fan uses, better heat-radiation effect, advantageously ensure that first shines
The service life of chip, the second luminescence chip.
Detailed description of the invention
Fig. 1 is reflective half cup inner reflection face structural schematic diagram.
Fig. 2 is vehicle front lighting headlight system configuration schematic diagram (round lens).
Fig. 3 is vehicle front lighting headlight system mounted configuration schematic diagram (round lens).
Fig. 4 is vehicle front lighting headlight system configuration schematic diagram (square-lens).
Fig. 5 is vehicle front lighting headlight system mounted configuration schematic diagram (square-lens).
Fig. 6 is the first luminescence chip, the second luminescence chip scheme of installation.
Fig. 7 is the light type schematic illustration that emergent ray of the present invention is formed.
Fig. 8 is the light type schematic diagram that orthodox car headlight system is formed.
Fig. 9 is the light type schematic diagram that vehicle front lighting headlight system of the present invention is formed.
Attached meaning marked in the figure is as follows:
The reflective half cup of 10-；The first reflecting curved surface of 11-；111- curved sections A1,112- curved sections B；113- curved sections A2；12-
Second reflecting curved surface；121- curved sections C1；122- curved sections D；123- curved sections C2；13- notch；20- radiator；31- first
Luminescence chip；The second luminescence chip of 32-；40- lens；50- sleeve；The light-blocking mechanism of 60- solenoid valve；70- fan；81- dipped beam light
Circle；82- distance light aperture；83- light filling aperture.
Specific embodiment
More specific detail is made to technical solution of the present invention below with reference to embodiment:
The present invention includes lens 40, luminescence chip and the reflective half cup 10 with light source cooperation, described anti-as shown in Figure 1:
The cup body medial surface of light half cup 10 is the reflecting surface cooperated with light source, and the reflecting surface includes the first reflecting curved surface 11 and second
Reflecting curved surface 12, wherein the first reflecting curved surface 11 is close to rim of a cup, the second reflecting curved surface 12 is close to bottom of a cup；First reflecting curved surface
11 include along curved sections A1, curved sections B and the curved sections A2 for sequentially forming and smoothly transitting perpendicular to cup body axial direction, institute
Stating the second reflecting curved surface 12 includes along curved sections C1, the curved sections D for sequentially forming and smoothly transitting perpendicular to cup body axial direction
And curved sections C2；The curved sections A1 and curved sections A2 is arranged symmetrically in the two sides of curved sections B and curvature is all α 1, the song
The curvature of face section B is that α 2, the curved sections C1 and curved sections C2 are arranged symmetrically in the two sides of curved sections D and curvature is all α 3, institute
The curvature for stating curved sections D is α 4, wherein 2 < α of α, 1 < α, 4 < α 3.
The present invention under the precondition that light type meets laws and regulations requirement, by cup body internal reflection surface be arranged to curved sections A1,
Curved sections B, curved sections A2, curved sections C1, curved sections D and curved sections C2, and by the setting of amount of curvature, before realizing automobile
It is wider according to headlight emergent ray, and the range of exposures of 90 degree of angle width can be formed, it solves automobile and there is illumination in turning
The problem of blind area, substantially increases the safety of night driving；The present invention can make the emergent light of vehicle front lighting headlight simultaneously
Line is higher, can be irradiated to the higher position of road, facilitates driver to see the guideboard information etc. positioned at road high level clearly with this,
It further ensures traffic safety, also improves the comfort of driving.
Orthographic projection length and first reflecting curved surface 11 positive throwing in cup body radially of the curved sections B in cup body radially
The ratio of shadow length is equal to curved sections D122 in cup body orthographic projection length radially and the second reflecting curved surface 12 in cup body diameter
The ratio of upward orthographic projection length.
Orthographic projection length of the cup body internal reflection surface in cup body axial direction is L1, wherein the first reflecting curved surface 11 is in cup
Orthographic projection length in body axial direction is 5L1/ 7, orthographic projection length of second reflecting curved surface 12 in cup body axial direction is 2L1/7。
First reflecting curved surface 11 is L in the orthographic projection length of cup body radially2, the curved sections A1, curved sections
A2113 is respectively 3.5L in the orthographic projection length of cup body radially2The positive throwing of/16, the curved sections B121 in cup body radially
Shadow length is 9L2/16.Second reflecting curved surface 12 is in cup body orthographic projection length radially and the curved sections C1121, song
The ratio of orthographic projection length of the face section C2123 in cup body radially is respectively 3.5/16, and second reflecting curved surface 12 is in cup body
The ratio of orthographic projection length and orthographic projection length of the curved sections D122 in cup body radially radially is 9/16.
The present invention by the ratio to above-mentioned first reflecting curved surface 11, the second reflecting curved surface 12, curved sections A1, curved sections B,
The ratio of curved sections A2, curved sections C1, curved sections D, curved sections C2 ratio be in optimized selection, improve emergent light line width
While degree, height, the illumination of vehicle front lighting headlight emergent ray is also further improved, illumination of the present invention reaches 180lux,
That is emergent ray brightness is higher, as shown in Figure 8,9, the reflective half cup of the present invention be formed by the light type illumination of emergent ray compared to
The reflective half cup of tradition it is higher, and light line width is wider, ray height is higher.The reflective half cup of the present invention makes the light efficiency benefit of lamp source
With also reaching 82% or more.
In order to reinforce the intensity of cup body, the present invention is equipped with arc notch, the arc at the rim of a cup of the reflective half cup
Notch plays the role of reinforcing rib.
As shown in Fig. 2,3,4,5: the system further includes radiator 20 and the fan 70 for being mounted on 20 bottom of radiator, institute
Stating 20 top of radiator is the positioning table 21 for installing the luminescence chip, and 21 edge of positioning table is equipped with will be described reflective
Half cup 10 is located at the fixed station 22 right above luminescence chip；The positioning table 21 includes close to bottom of a cup and for installing the first hair
The horizontal location section 211 of optical chip 31 and close rim of a cup and the sloped position section 212 for installing the second luminescence chip 32, institute
The gradient for stating sloped position section 212 is 30 degree.
It is as shown in Figure 6: the distance between first luminescence chip 31 and rim of a cup L3, second luminescence chip 32 and cup
The distance between mouth is L4, orthographic projection length of the cup body internal reflection surface in cup body axial direction is L1, wherein L3With L1Ratio
Value is 0.8-0.9, L4With L1Ratio be 0.2-0.3.
First luminescence chip 31 of the present invention can form distance-light, and second luminescence chip 32 has light filling function
I.e. on the basis of the first luminescence chip 31 is formed by emergent ray, cooperate the reflex of reflective half cup 10 that can effectively increase
Adding the height of emergent ray, it is ensured that sight is wider on the run at night by driver, the first luminescence chip 31 of the present invention,
The installation site of second luminescence chip 32 also has vital influence to the light type effect that emergent ray is formed, and needs especially
Pay attention to.
Radiator 20 of the present invention has heat sinking function to the first luminescence chip 31, the second luminescence chip 32, cooperates wind
Fan 70 uses, and better heat-radiation effect advantageously ensures that the service life of the first luminescence chip 31, the second luminescence chip 32.
The system further includes sleeve 50, and the lens 40 are connected in 50 one end of sleeve, and the radiator 20 is fixed on sleeve
50 other ends, the radiator 20 are light-blocking in the solenoid valve that the position screw in front of car light is connected with progress distance-light adjusting
Mechanism 60.The course of work of the invention: the first luminescence chip 31, the second luminescence chip 32 shine, and first carry out through reflective half cup 10
Optically focused, then light is formed by channel by reflective 10 rim of a cup of half cup and positioning table 21 and enters in sleeve 50, and light goes out to be adopted when setting
Carrying out optically focused again with lens 40, to use for vehicle front illumination, the light-blocking mechanism 60 of solenoid valve can form clearly light and shade
Dead line, according to needs are driven, the adjusting of distance-light is may be implemented in the operation light-blocking mechanism 60 of solenoid valve.Emergent light of the present invention is linear
At light type schematic diagram as shown in fig. 7, the first luminescence chip 31 shine through reflective half cup 10 reflection after formed dipped beam aperture 81 with
And distance light aperture 82, second luminescence chip 32 shine and form light filling aperture 83 after the reflection of reflective half cup 10.
Claims (9)
1. a kind of vehicle front lighting headlight system, including lens (40), luminescence chip and reflective half cup (10) with light source cooperation,
Be characterized in that: the cup body medial surface of the reflective half cup (10) is the reflecting surface cooperated with light source, and the reflecting surface includes first
Reflecting curved surface (11) and the second reflecting curved surface (12), wherein the first reflecting curved surface (11) is close to rim of a cup, the second reflecting curved surface
(12) close to bottom of a cup；First reflecting curved surface (11) includes that edge sequentially forms and smoothly transits perpendicular to cup body axial direction
Curved sections A1 (111), curved sections B (112) and curved sections A2 (113), second reflecting curved surface (12) include along perpendicular to
Curved sections C1 (121), curved sections D (122) and the curved sections C2 (123) that cup body axial direction is sequentially formed and smoothly transitted；
The curved sections A1 (111) and curved sections A2 (113) are arranged symmetrically in the two sides of curved sections B (112) and curvature is all α 1, described
The curvature of curved sections B (112) is α 2, and the curved sections C1 (121) and curved sections C2 (123) are arranged symmetrically in curved sections D (122)
Two sides and curvature be all α 3, the curvature of the curved sections D (122) is α 4, wherein 2 < α of α, 1 < α, 4 < α 3.
2. vehicle front lighting headlight system as described in claim 1, it is characterised in that: the curved sections B (112) is in cup body radial direction
On orthographic projection length and the ratio of the orthographic projection length of the first reflecting curved surface (11) in cup body radially be equal to curved sections D
(122) ratio of the orthographic projection length and the orthographic projection length of the second reflecting curved surface (12) in cup body radially in cup body radially
Value.
3. vehicle front lighting headlight system as claimed in claim 2, it is characterised in that: the cup body internal reflection surface is in cup body axis
Upward orthographic projection length is L1, wherein orthographic projection length of the first reflecting curved surface (11) in cup body axial direction is 5L1/ 7, it is described
Orthographic projection length of second reflecting curved surface (12) in cup body axial direction is 2L1/7。
4. vehicle front lighting headlight system as claimed in claim 2, it is characterised in that: first reflecting curved surface (11) is in cup body
Orthographic projection length radially is L2, the curved sections A1 (111), curved sections A2 (113) are long in the orthographic projection of cup body radially
Degree is respectively 3.5L2/ 16, the curved sections B (121) is 9L in the orthographic projection length of cup body radially2/16。
5. vehicle front lighting headlight system as described in claim 1, it is characterised in that: the system further includes radiator (20), institute
Stating radiator (20) top is the positioning table (21) for installing the luminescence chip, and positioning table (21) edge is equipped with institute
State the fixed station (22) that reflective half cup (10) is located at right above luminescence chip；The positioning table (21) includes close to bottom of a cup and use
In the horizontal location section (211) of installation the first luminescence chip (31) and close to rim of a cup and for installing the second luminescence chip (32)
Sloped position section (212), the gradient of the sloped position section (212) is 30 degree.
6. vehicle front lighting headlight system as described in claim 1, it is characterised in that: set at the rim of a cup of the reflective half cup (10)
There is the arc notch (13) for increasing cup body intensity.
7. vehicle front lighting headlight system as claimed in claim 5, it is characterised in that: first luminescence chip (31) and rim of a cup
The distance between L3, the distance between second luminescence chip (32) and rim of a cup are L4, the cup body internal reflection surface is in cup body
Orthographic projection length in axial direction is L1, wherein L3With L1Ratio be 0.8-0.9, L4With L1Ratio be 0.2-0.3.
8. vehicle front lighting headlight system as claimed in claim 5, it is characterised in that: the system further includes sleeve (50), described
Lens (40) are connected in sleeve (50) one end, and the radiator (20) is fixed on sleeve (50) other end, the radiator (20)
The light-blocking mechanism of solenoid valve (60) for carrying out distance-light adjusting is connected in the position screw in front of car light.
9. vehicle front lighting headlight system as claimed in claim 5, it is characterised in that: radiator (20) bottom is equipped with wind
It fans (70).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811430779.5A CN109539167B (en) | 2018-11-28 | 2018-11-28 | Automobile headlamp system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811430779.5A CN109539167B (en) | 2018-11-28 | 2018-11-28 | Automobile headlamp system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109539167A true CN109539167A (en) | 2019-03-29 |
| CN109539167B CN109539167B (en) | 2024-02-09 |
Family
ID=65850785
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811430779.5A Active CN109539167B (en) | 2018-11-28 | 2018-11-28 | Automobile headlamp system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260259A (en) * | 2019-07-10 | 2019-09-20 | 浙江比肯科技有限公司 | A kind of split type reflector using single light source |
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