CN109827137A - A kind of laser headlight and its lighting system, Laser semi-guiding method - Google Patents
A kind of laser headlight and its lighting system, Laser semi-guiding method Download PDFInfo
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- CN109827137A CN109827137A CN201810937217.3A CN201810937217A CN109827137A CN 109827137 A CN109827137 A CN 109827137A CN 201810937217 A CN201810937217 A CN 201810937217A CN 109827137 A CN109827137 A CN 109827137A
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- laser
- light
- polarization splitting
- splitting prism
- monitoring device
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Abstract
The present invention relates to a kind of laser headlight and its lighting system, Laser semi-guiding method, the present invention is provided with polarization splitting prism, and laser light source is set to the plane of incidence of polarization splitting prism, and reflecting mirror is set on the light transmission path of polarization splitting prism；The laser that laser light source generates is irradiated to polarization splitting prism after being converted to white light by fluorescence coating, wherein the P-polarized light in white light is irradiated to reflecting mirror through polarization splitting prism, and is irradiated to road surface after reflecting mirror reflects and forms illumination；If the phosphor powder layer of fluorescent screen falls off or by laser breakdown, then unconverted laser is emitted directly toward polarization splitting prism, and laser is all reflected by polarization splitting prism as S polarized light, avoids laser and pass through reflecting mirror directive road surface, pedestrian is damaged, realizes passive security protection.Solve the problem of that the laser leakage as caused by fluorescence coating is damaged of laser headlight damages human eye.
Description
Technical field
The present invention relates to the security protections of laser headlight, and in particular to a kind of laser headlight and its lighting system, laser peace
Full protection method.
Background technique
Along with the development of light source technology, laser steps into automobile market as a kind of brand-new light source, due to laser
High brightness and laser light source itself well collimated performance and held in both hands by market heat.There is laser to do light source production distance light at present
Occur on the market with the lamps and lanterns of auxiliary distance light.But laser needed in use as special light sources it is additional note that according to
The description of national legislation, 4 grades of laser of 3B grades of Class and class may all cause permanent damage to human eye, and improper use will
The driver that can be driven a vehicle to pedestrian and opposite damages.
As Fig. 1 has portion when the high-energy light beam guiding as caused by external force or laser smashes, punctures fluorescent converters part
Divide blue laser to pass through crack and directly reaches outside.According to the difference of light distribution form, this blue light can be finally projected on road surface.
Currently in order to realize higher luminous flux, the power of semiconductor laser used in mode of laser group generally can all reach 1W with
On.4 laser of Class is classified as according to laser of the security organization to the definition 1W of laser.The laser of this rank means
Of short duration direct-view also can cause permanent injury to human eye.This means that the continuous white light of output is just when fluorescent device is complete
It is harmless, but when its internal 4 blue laser of class generates leakage, it is possible to human eye is damaged.
In the prior art for the protection of laser, typically aperture on the mirror, when blue laser leakage occurs,
Laser is directed through reflecting mirror aperture, will not reflect, to avoid blue light illumination to road surface, damages to pedestrian.It is existing
This mode having is more demanding to the size of reflecting mirror aperture, it is necessary to can guarantee that all leakage lasers can be all by opening
Hole, when design, are time-consuming and laborious to the calculating of bore size, and are possible to cause some blue light to leak because inaccuracy is calculated.
Summary of the invention
The object of the present invention is to provide a kind of laser headlights and its lighting system, Laser semi-guiding method, the present invention to exist
Polarization splitting prism is set in laser headlight, realizes passive security protection when laser leakage, and it is real that light leakage monitoring device is arranged
Active safety protection when existing laser leakage is leaked to solve laser headlight laser as caused by fluorescence coating is damaged, to people
The problem of eye damages.
To achieve the above object, the scheme of the invention is: a kind of lighting system of laser headlight, including laser light source, glimmering
Optical screen and reflecting mirror, the fluorescent screen are set to the light-emitting window of laser light source, for blue laser to be converted to white light, the vehicle
Lamp illuminating system further includes polarization splitting prism, and the laser light source is set to the plane of incidence of polarization splitting prism, the reflection
Mirror is set on the light transmission path of polarization splitting prism；
White light is converted to after the laser irradiation to fluorescent screen that the laser light source generates, the light irradiation that the white light issues
To polarization splitting prism, wherein the P-polarized light in white light is irradiated to reflecting mirror through polarization splitting prism, and passes through reflecting mirror
It is irradiated to road surface after reflection and forms illumination；
If the phosphor powder layer of fluorescent screen falls off or by laser breakdown, unconverted laser is emitted directly toward polarization spectro rib
Mirror, laser are all reflected as S polarized light by polarization splitting prism, by reflecting mirror directive road surface, are realized with to avoid laser
Passive security protection.
Further, the lighting system includes light leakage monitoring device, and the light leakage monitoring device is used for real-time monitoring
Whether blue leakage is occurred, and the light leakage monitoring device is set on the reflected light path of polarization splitting prism, the S polarized light
The directive light leakage monitoring device after polarization splitting prism reflects determines fluorescence if light leakage monitoring device monitors that light intensity increases
Bisque rupture, occurs blue leakage, sends control signal, closes laser light source, realizes active safety protection.
Further, filter plate is set before the light leakage monitoring device, and the filter plate is for filtering out other than blue wave band
Other light, make light leakage monitoring device that can only monitor the light intensity of blue wave band, at the same weaken reach light leakage monitoring device light
By force, so that the work of light leakage monitoring device is in effective range.
Further, the light leakage monitoring device includes wiring board and light intensity detection module, the light intensity detection module peace
Fill in the circuit board
Further, institute's light intensity detection module includes photo resistance.
Further, the polarization splitting prism is formed by a pair of of right-angle prism by bevel edge gluing, and in the oblique of gluing
Polarization beam splitter is coated on face.
Further, radiator is arranged in the laser light source, and the laser light source and light leakage monitoring device are installed in
On radiator.
Further, the laser light source is laser generator.
The present invention also provides a kind of laser headlights using said lighting system.
The present invention also provides a kind of Laser semi-guiding method for above-mentioned laser headlight, the Laser semi-guidings
Method is as follows:
Laser semi-guiding device is set in laser headlight, and the Laser semi-guiding device includes polarization spectro rib
Mirror, falls off in the phosphor powder layer of fluorescent screen or when by laser breakdown, the laser that do not converted shines directly into polarization splitting prism
On, the polarization splitting prism all reflects incident laser, avoids laser by reflecting mirror directive road surface, makes to pedestrian
At injury, passive security protection is realized.
Further, light leakage monitoring is arranged in the Laser semi-guiding method on the reflected light path of polarization splitting prism
Device, the laser directive light leakage monitoring device reflected by polarization splitting prism, light leakage monitoring device real-time detection light intensity work as detection
When increasing to light intensity, control signal is sent, laser light source is closed, realizes active safety protection.
It is that the present invention reaches the utility model has the advantages that the present invention using laser is that the characteristic of complete polarized light and polarised light can not
Direct projection goes out the characteristic of polarization splitting prism, and light leakage monitoring device, shape are arranged on reflection path of the laser through polarization splitting prism
At failure detection, i.e., when light leakage monitoring device detects light intensity increase, i.e. confirmation phosphor powder layer falls off or by laser breakdown, causes
Laser shines directly into polarization spectroscope, meanwhile, by the reflection of polarization splitting prism, avoid the laser irradiation of leakage to road
Face damages pedestrian.
Detailed description of the invention
Fig. 1 is blue leakage schematic diagram.
Fig. 2 is the light path principle figure of polarization splitting prism；
Fig. 3 and Fig. 4 is the structural schematic diagram of laser headlamp illumination system of the present invention；
Fig. 5 and Fig. 6 is the light path schematic diagram when phosphor powder layer of fluorescent screen ruptures.
Specific embodiment
The present invention is described in further detail with specific embodiment with reference to the accompanying drawing.
Laser headlamp illumination system embodiment:
As shown in Figures 3 and 4, the lighting system of laser headlight of the present invention include laser light source 1, fluorescent screen 1a, reflecting mirror 3,
Polarization splitting prism 2, optical filter 4, light leakage monitoring device 5 and radiator 6.Wherein, laser light source 1 and light leakage monitoring device 5 are set
It is placed on radiator, fluorescent screen is set to the light source outlet of laser light source, and reflecting mirror is set to the light transmission road of polarization splitting prism
On diameter, light leakage monitoring device is set on the reflected light path of polarization splitting prism, and optical filter is set to light leakage monitoring device
Between polarization splitting prism.
Wherein, polarization splitting prism is cube structure, passes through bevel edge gluing by a pair of of high-precision right-angle prism 2a, 2b
At being coated with polarization beam splitter on glued inclined-plane, incident light can be divided into the vertical linearly polarized light of two beams, incident light both included
P-polarized light also includes S polarized light, wherein P-polarized light is the light wave of the parallel plane of incidence of light vibration, and S polarized light is hung down for light vibration
The light wave of the straight plane of incidence, as shown in Figure 2, wherein P-polarized light can be completely through polarizing beam splitter, and S polarized light is with 45 degree of angles
It is reflected at the glued inclined-plane of polarizing beam splitter, the exit direction and P-polarized light of S polarized light are at an angle of 90 degrees.
As shown in figure 4, light leakage monitoring device includes wiring board 5b and light intensity detection module 5a, the light intensity detection module 5a
For photo resistance, photo resistance is contact conductor to be loaded onto semiconductor photosensitive material ends, by its envelope based on inner photoeffect
Photo resistance is just constituted in the shell with transparency window, the 5c in Fig. 4 is setting semiconductor photosensitive material in encapsulating structure
The region of material.It is irradiated in photo resistance by the light that polarization splitting prism reflects, is changed using photo resistance with light intensity
Characteristic detect light intensity, when the resistance value of photo resistance has obvious fluctuation, that is, be determined with more blue light illuminations and come, explanation
Phosphor powder layer falls off or by laser breakdown.
In the case of normal illumination, after the laser irradiation to the phosphor powder layer of fluorescent screen 1a that laser light source 1 generates, it is converted into
Common white light, the light of white light are irradiated to polarization splitting prism 2 first, are mixed with S polarized light and P-polarized light in white light,
Middle P-polarized light penetrates polarization splitting prism 2, and S polarized light is reflected by polarization splitting prism, and white light is emitted through polarization splitting prism 2
Afterwards, the orthogonal S polarized light of two beams and P-polarized light are formed, wherein the P-polarized light for penetrating polarization splitting prism 2 is irradiated to instead
It penetrates on mirror 3, is irradiated to road surface after the reflection of reflecting mirror 3 and forms illumination；The S polarized light reflected by polarization splitting prism 2 is through filtering
Light leakage monitoring device 5 is irradiated to after wave plate 4.Since the light intensity of S polarized light at this time is lower, the light intensity after filter plate 4 is remote
Resistance value lower than the monitoring range of light leakage monitoring device 5, at this time photo resistance has no significant change.Wherein, filter plate can incite somebody to action
The luminous energy of every other wavelength other than 440-460nm all filters, and guarantees that 5 laser light sources of light leakage monitoring device issue
Laser blue light energy, improve monitoring accuracy.
As shown in Figure 5 and Figure 6, when phosphor powder layer falls off or by laser breakdown, laser is emitted directly toward polarization splitting prism
2, since laser belongs to complete polarised light, as S wave, it is not present corpuscular property (P wave), therefore, it is impossible to penetrate polarization spectro rib
Mirror, so laser all reflections at the glued inclined-plane of polarization splitting prism 2, avoid laser and be emitted directly toward reflecting mirror 3, that is, keep away
Exempt from laser by 3 directive road surface of reflecting mirror, causes pedestrian's eyes by high intensity laser beam irradiation and the risk of injury, it is passive to realize
Security protection.
It falls off in phosphor powder layer or in the case where by laser breakdown, the laser reflected by polarization splitting prism 2 is by filtering
Piece 4 still has stronger luminous energy to be irradiated to light leakage monitoring device 5 after filtering, to be detected by light leakage monitoring device 5, if light leakage is supervised
It surveys device 5 and monitors that the resistance value of photo resistance has larger fluctuation in monitoring process, then more blue leakages can be confirmed
Out, phosphor powder layer ruptures, that is, sends control signal, close laser light source 1, realizes active safety protection.
Laser headlight embodiment:
The laser headlight of the present embodiment includes the lighting system in said lighting system embodiment.
Laser semi-guiding embodiment of the method:
Polarization splitting prism and light leakage monitoring device are set in laser headlight, the phosphor powder layer of fluorescent screen fall off or by
When laser breakdown, the laser that do not converted is shone directly on polarization splitting prism, and the polarization splitting prism swashs incident
Light all reflects, directive light leakage monitoring device, light leakage monitoring device real-time detection light intensity, when detecting light intensity increase, sends
Signal is controlled, laser light source is closed, realizes active safety protection.Meanwhile laser is avoided by reflecting mirror directive road surface, to row
People damages, and realizes passive security protection.
Claims (10)
1. a kind of lighting system of laser headlight, including laser light source, fluorescent screen and reflecting mirror, the fluorescent screen are set to laser
The light-emitting window of light source, for blue laser to be converted to white light, it is characterised in that:
The vehicle light illumination system further includes polarization splitting prism, and the laser light source is set to the incidence of polarization splitting prism
Face, the reflecting mirror are set on the light transmission path of polarization splitting prism；
White light is converted to after the laser irradiation to fluorescent screen that the laser light source generates, the light that the white light issues is irradiated to partially
Shake Amici prism, wherein the P-polarized light in white light is irradiated to reflecting mirror through polarization splitting prism, and reflects by reflecting mirror
After be irradiated to road surface formed illumination；
If the phosphor powder layer of fluorescent screen falls off or by laser breakdown, unconverted laser is emitted directly toward polarization splitting prism,
Laser is all reflected as S polarized light by polarization splitting prism, with to avoid laser, by reflecting mirror directive road surface, it is passive to realize
Security protection.
2. lighting system according to claim 1, which is characterized in that the lighting system includes light leakage monitoring device,
Whether the light leakage monitoring device occurs blue leakage for real-time monitoring, and the light leakage monitoring device is set to polarization spectro rib
On the reflected light path of mirror, S polarized light directive light leakage monitoring device after polarization splitting prism reflects, if light leakage monitoring dress
It sets and monitors that light intensity increases, then determine that phosphor powder layer ruptures, blue leakage occurs, send control signal, close laser light source, it is real
Existing active safety protection.
3. lighting system according to claim 2, which is characterized in that filter plate is arranged before the light leakage monitoring device, institute
It states filter plate to be used to filter out other light other than blue wave band, makes light leakage monitoring device that can only monitor the light intensity of blue wave band,
Weaken the light intensity for reaching light leakage monitoring device simultaneously, so that the work of light leakage monitoring device is in effective range.
4. lighting system according to claim 1, which is characterized in that the light leakage monitoring device includes wiring board and light intensity
Detection module, the light intensity detection module installation is in the circuit board.
5. lighting system according to claim 1, which is characterized in that the light intensity detection module is photo resistance.
6. lighting system according to claim 1, which is characterized in that the polarization splitting prism is led to by a pair of of right-angle prism
It crosses bevel edge gluing to form, and is coated with polarization beam splitter on glued inclined-plane.
7. lighting system according to claim 1, which is characterized in that radiator, the laser is arranged in the laser light source
Light source and light leakage monitoring device are respectively mounted on a heat sink.
8. a kind of laser headlight using lighting system as described in claim 1.
9. a kind of Laser semi-guiding method of laser headlight described in claim 8, it is characterised in that: the Laser semi-guiding
Method is as follows:
Laser semi-guiding device is set in laser headlight, the Laser semi-guiding device includes polarization splitting prism,
The phosphor powder layer of fluorescent screen falls off or when by laser breakdown, and the laser that do not converted shines directly on polarization splitting prism, institute
It states polarization splitting prism and all reflects incident laser, avoid laser by reflecting mirror directive road surface, pedestrian is caused to hurt
Evil realizes passive security protection.
10. safety protecting method according to claim 9, which is characterized in that the Laser semi-guiding method is polarizing
Light leakage monitoring device is set on the reflected light path of Amici prism, and the laser directive light leakage reflected by polarization splitting prism monitors dress
It sets, light leakage monitoring device real-time detection light intensity, when detecting light intensity increase, sends control signal, close laser light source, realize
Active safety protection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810937217.3A CN109827137A (en) | 2018-08-16 | 2018-08-16 | A kind of laser headlight and its lighting system, Laser semi-guiding method |
| PCT/CN2019/070775 WO2020034565A1 (en) | 2018-08-16 | 2019-01-08 | Laser headlamp and illuminating system thereof, and laser safety protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810937217.3A CN109827137A (en) | 2018-08-16 | 2018-08-16 | A kind of laser headlight and its lighting system, Laser semi-guiding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109827137A true CN109827137A (en) | 2019-05-31 |
Family
ID=66859546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810937217.3A Withdrawn CN109827137A (en) | 2018-08-16 | 2018-08-16 | A kind of laser headlight and its lighting system, Laser semi-guiding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109827137A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110260257A (en) * | 2019-07-11 | 2019-09-20 | 华域视觉科技(上海)有限公司 | A kind of headlamp based on PBS optical splitter |
| CN111629491A (en) * | 2020-03-23 | 2020-09-04 | 北京全路通信信号研究设计院集团有限公司 | Safety type LED intelligent signal machine control system and method |
| WO2022152591A1 (en) * | 2021-01-12 | 2022-07-21 | Signify Holding B.V. | Robust and intrinsically safe laser failure detection in the electrical circuit |
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Application publication date: 20190531 |