CN208579278U

CN208579278U - Vehicles laser lamp protective device

Info

Publication number: CN208579278U
Application number: CN201821411737.2U
Authority: CN
Inventors: 王铿
Original assignee: HASCO Vision Technology Co Ltd
Current assignee: HASCO Vision Technology Co Ltd
Priority date: 2018-08-30
Filing date: 2018-08-30
Publication date: 2019-03-05
Anticipated expiration: 2028-08-30

Abstract

The utility model relates to a kind of vehicles laser lamp protective devices, including laser light source, secondary optics element；The blue light wavelength of required protection is λ₀；Plate glass inner cover is fixed on the outside of the secondary optics element；The reflective film unit that several layers are formed by stacking is coated on the inside of the plate glass inner cover substrate；The reflective film unit has two layers from inside to outside, and internal layer is that optical thickness is λ₀/ 4 high refractive index film, outer layer are that optical thickness is λ₀/ 4 low refractive index film.The utility model increases by a glass plate inner cover comprising dielectric multi-layer optical thin film in front of the secondary light-distribution element of laser light source; pass through the design to plural layers on plate; the high reflection to the 445nm-455nm wave-length coverage of laser light source may be implemented; it avoids blue light from leaking to outside, protects the safety of pedestrian and driver.

Description

Vehicles laser lamp protective device

Technical field

The utility model relates to a kind of automobile lamps, are a kind of vehicles laser lamp protective devices specifically.

Background technique

With the rapid development of semiconductor technology, LED light source is applied on automotive lighting on a large scale, meanwhile, swash Radiant also starts being used on automotive lighting gradually.Laser light source has monochromaticjty good, high directivity and brightness This characteristic of the features such as high, especially high brightness generates the light source applications as auxiliary distance light in volume production lamp by part On tool.But laser light source also has additional requirement in use, according to national legislation, 4 grades of CLASS 3B's and CLASS Laser all may generate permanent damage to human eye, if improper use can be to pedestrian and driver.

Laser white light source and LED white light source in itself without too big difference, be all excited by blue light it is glimmering Light powder generates yellow light, and the yellow light of blue light and excitation through fluorescent powder forms white light.The maximum difference of two kinds of light sources is LED light The light emitting angle in source is big, and the light emitting angle of laser semiconductor is small, and can generally arrange in pairs or groups a laser shaping lens.

When causing fluorescent powder to fail due to external force or inner case, the blue light of high-energy will be leaked to outside, by In being both greater than 1W or more using the laser light source on car light, according to the definition of security organization, it is classified as 4 class of CLASS and swashs Light device can cause permanent injury to human eye when the laser of this rank means to generate blue laser leakage.

At present both at home and abroad for the method for lasing safety, emergency safeguard measure is usually only taken, i.e., on laser light source Fang Kaiyi aperture places corresponding monitor and just actively closes laser light source when having monitored blue light leakage.

This mode in emergency circumstances actively closing laser light source, although realizing the function of active protection, On the one hand, certain undesirable influence is caused for the experience of user, on the other hand, only the protection with emergency cut-off is arranged It applies, without the measure of prevention, the prevention effect of preventing laser leakage is lacking.

Utility model content

The purpose of this utility model is: providing a kind of vehicles laser lamp protective device, i.e. two in laser light source Increase by a glass plate inner cover comprising dielectric multi-layer optical thin film in front of secondary light distribution element, by setting to plural layers on plate Meter, may be implemented the high reflection to the 445nm-455nm wave-length coverage of laser light source, and blue light is avoided to leak to outside, protection row The safety of people and driver.

The utility model takes following technical scheme:

A kind of vehicles laser lamp protective device, including laser light source 10, secondary optics element 20；Required protection Blue light wavelength is λ₀；Plate glass inner cover 30 is fixed on the outside of the secondary optics element；30 base of plate glass inner cover The reflective film unit that several layers are formed by stacking is coated on the inside of bottom；The reflective film unit has two layers from inside to outside, interior Layer is that optical thickness is λ₀/ 4 high refractive index film 31, outer layer are that optical thickness is λ₀/ 4 low refractive index film 32.

Further, the substrate material of the plate glass inner cover 30 is glass.

Further, the λ₀For 445-455nm, bandwidth 10nm.

Further, the plate glass inner cover 30 snaps connection or welding with secondary optics element 20.

Further, the λ₀For 450nm.

Further, it is connected between neighboring reflection film unit by coating.There are many kinds of the modes of coating, such as colloidal sol Gel, magnetron sputtering etc..

Further, the number of plies of the reflective film unit is layer 2-4.

Further, the laser lamp is headlight for vehicles or headlamp.

The utility model has the beneficial effects that:

1) increase by a glass plate inner cover comprising dielectric multi-layer optical thin film in front of the secondary light-distribution element of laser light source, lead to The design to plural layers on plate is crossed, may be implemented to keep away the high reflection of the 445nm-455nm wave-length coverage of laser light source Exempt from blue light and leak to outside, protects the safety of pedestrian and driver.

2) probability for actively closing laser light source can be greatly reduced, to reduce since blue light is revealed for user's Adverse effect caused by experience.

3) it on the basis of active emergency cut-off safeguard measure, equivalent to increase the measure of prevention, improves blue light and lets out The effect of the prevention of dew, improves security reliability.

Detailed description of the invention

Fig. 1 is the overall schematic of vehicles laser lamp protective device.

Fig. 2 is the cross-sectional view of vehicles laser lamp protective device.

Fig. 3 is that the light of laser light source passes through the light schematic diagram of secondary optics element and plate glass inner cover.

Fig. 4 is high low-refraction and the light schematic diagram passed through in plate glass inner cover plural layers.

Specific embodiment

The present invention will be further described in the following with reference to the drawings and specific embodiments.

It is illustrated firstly, for basic principle:

It is n in refractive index_gSubstrate on be plated with optical thickness be λ₀/ 4 high refractive index n₁Film layer after, due to air-film Layer and film layer-substrate interface reflected light greatly increase reflectivity with position phase.For central wavelength lambda₀Monofilm and substrate group The admittance of conjunction are as follows:

Normal-incidence reflection rate are as follows:

Wherein n₀For the refractive index of incident first layer medium, such as first layer medium is air, then n₀=1.

It is alternate with high and low refractive index, every layer of λ₀/ 4 thick dielectric multilayer-films can obtain higher reflectivity.This be because For the light beam reflected from all interfaces of membrane system, there is identical bits phase when they return to front surface, so that constructive interference is generated, To such one group of dielectric coating series, theoretically it is expected to obtain the reflectivity in close proximity to 100%.

Next, if n_HAnd n_LIt is the refractive index of high and low refractive index layer, and keeps the outermost layer on dielectric coating series both sides high Index layer, every layer of thickness are λ₀/ 4, for central wavelength lambda₀Combine admittance are as follows:

In formula, n_gIt is the refractive index of substrate, 2S+l is the number of plies of plural layers.

Thus, in air when vertical incidence, central wavelength lambda₀Reflectivity, i.e. maximum reflectivity are as follows:

By last time it is found that n_H/n_LRatio is bigger or the number of plies is more, then reflectivity is higher.

Reflection characteristic based on multilayer film, we increase by a plate glass lampshade before laser distance light device, specific side Case is as follows:

Vehicle laser lamps and lanterns protective device, including laser light source 10, secondary optics element 20；The blue light wavelength of required protection For λ₀；Plate glass inner cover 30 is fixed on the outside of the secondary optics element；The inside of 30 substrate of plate glass inner cover It is coated with the reflective film unit that several layers are formed by stacking；The reflective film unit has two layers from inside to outside, and internal layer is optics With a thickness of λ₀/ 4 high refractive index film 31, outer layer are that optical thickness is λ₀/ 4 low refractive index film 32, in order to increase reflection Rate, the film number of plies are necessary for two layers or more.

The substrate material of the plate glass inner cover 30 is glass.

The plate glass inner cover 30 is snapped connection with secondary optics element 20 or welding.

The λ₀For 450nm.

It is connected between neighboring reflection film unit by coating.

The number of plies of the reflective film unit is layer 2-4.

Be plated with the film at high low-refraction interval on this plate glass lampshade, every layer film with a thickness of needing to protect wave Long 1/4.Here we use its blue light range of laser light source 445nm-455nm, central wavelength 450nm, bandwidth are 10nm.When laser light source in normal work, generation is white light, and plate glass mask does not influence to use, when laser light source by When certain reasons generate blue light leakage, the plate glass mask in outside can be carried out the blue light near most of central wavelength Protection purpose is realized in reflection.

It is the preferred embodiment of the utility model above, those of ordinary skill in the art can also carry out respectively on this basis Kind of transformation improves, and under the premise of not departing from the utility model total design, these transformation or improves this reality all should belong to Within the scope of novel be claimed.

Claims

1. a kind of vehicles laser lamp protective device, it is characterised in that:

Including laser light source (10), secondary optics element (20)；The blue light wavelength of required protection is λ₀；

Plate glass inner cover (30) are fixed on the outside of the secondary optics element；Plate glass inner cover (30) substrate it is interior Side is coated with the reflective film unit that several layers are formed by stacking；

The reflective film unit has two layers from inside to outside, and internal layer is that optical thickness is λ₀/ 4 high refractive index film, outer layer are Optical thickness is λ₀/ 4 low refractive index film.

2. vehicles laser lamp protective device as described in claim 1, it is characterised in that: the plate glass inner cover (30) substrate material is glass.

3. vehicles laser lamp protective device as described in claim 1, it is characterised in that: the λ₀For 445-455nm, Bandwidth is 10nm.

4. vehicles laser lamp protective device as described in claim 1, it is characterised in that: the plate glass inner cover (30) and secondary optics element (20) snap connection or welding.

5. vehicles laser lamp protective device as claimed in claim 3, it is characterised in that: the λ₀For 450nm.

6. vehicles laser lamp protective device as described in claim 1, it is characterised in that: neighboring reflection film unit it Between pass through coating connect.

7. vehicles laser lamp protective device as described in claim 1, it is characterised in that: the reflective film unit The number of plies is layer 2-4.

8. vehicles laser lamp protective device as described in claim 1, it is characterised in that: the vehicles are vapour Vehicle.

9. vehicles laser lamp protective device as claimed in claim 8, it is characterised in that: the laser lamp is automobile Headlight or headlamp.