CN115902824A - Outer lens suitable for laser radar is integrated - Google Patents

Abstract

The invention provides an outer lens suitable for laser radar integration, which comprises: the outer lens body comprises a lens body and a transmission body which are integrally formed; the transmission body is a laser radar and a projection area of a laser radar emitting area on the outer lens body along the emitting direction; the transmission body is provided with a first lens outer side surface and a first lens inner side surface; an antireflection film is arranged on the outer side surface of the first lens and/or the inner side surface of the first lens; the laser radar is arranged on one side of the inner side surface of the outer lens body. The invention solves the problem of laser reflection loss of the laser radar and reduces the reflection loss by adopting the structure that the antireflection film coating is arranged in or outside the lens.

Description

Outer lens suitable for laser radar is integrated

Technical Field

The invention relates to the technical field of automobile lamps, in particular to an outer lens suitable for laser radar integration.

Background

At present, the requirements of purchasing vehicles by terminal customers are not limited to brands and models, and whether an advanced driving assistance system carried by a new vehicle has an automatic driving level L3 or not, and even higher levels become the concerns of the terminal customers when selecting and purchasing vehicle types. The car lamp is not only a bright point concerned in modeling, but also a part with functional safety requirements. As more and more electric vehicles are used, grilles are gradually developed to have lighting effects, and the grilles are merged with headlights, and the headlight model is derived from the concept of front face model. The vehicle lamp occupies four corners of the vehicle body and is also the position of the sensor layout, and the intelligent light integrating the modeling and the safety function is just like a market trend.

Along with the improvement of the automatic driving grade, the using number of the laser radars in the sensor can be increased, the integrated installation of the laser radars on the whole vehicle can also destroy the consistency of the shape of the whole vehicle, the attractiveness of the shape of the whole vehicle is damaged, a design space with a larger shape is provided for not damaging the shape of the whole vehicle, and the integration of the laser radars into a lamp can be considered.

In the prior art, laser radars are integrated in a grid area, a roof area, a front bumper area and the like of a vehicle, but the areas are metal plate ribs, and holes need to be formed in the areas due to the fact that the laser radars are integrated, so that the consistency of parts and systems of the areas of the vehicle can be damaged, and the appearance shape and the function of the vehicle can be damaged. The car light sets up in the position such as the front side of vehicle, the rear side, the upside, the car light that sets up in the vehicle front side includes the head-light, preceding fog lamp, the daytime driving lamp that even singly pulls out etc. the car light that sets up in the vehicle rear side includes tail lamp, back fog lamp, back-up light etc. the upside can set up high-order stop lamp, the car light sets up the position mainly in the front side, on two angles in the both sides of rear side, these several angular position are that the vehicle itself needs the trompil promptly and reserves the regional position that gives the car light setting, need not like the grid region, the roof region, the front bumper region is trompil again in addition and is stayed the region and set up laser radar.

Not destroying whole car panel beating molding with laser radar sensor integration in the lamp, can provide a better operational environment for the sensor again, promoted the detection performance of sensor, for the higher target signal of the integration algorithm of autopilot provides the degree of accuracy, can also derive some light functions that support ADAS and AD with the lamp, for example: in a dim scene, the sensor can emit warning light with moderate brightness after detecting a pedestrian to remind the pedestrian of carefully avoiding the coming vehicle behind the pedestrian, and help is provided for safe driving on the road.

When locating the laser radar sensor with the laser radar sensor, current laser radar sets up and all is that the outside no longer sets up the article, and the reason is that the laser radar outside sets up the article again and can shelter from totally or seriously influence the ripples of laser radar outgoing, though the laser radar outside article is transparent article and can not shelter from the laser radar outgoing wave totally, nevertheless can seriously reduce and influence the ripples of laser radar outgoing yet, makes its wave transmissivity reduce by a wide margin. Therefore, the laser radar in the prior art is integrated in the vehicle (no matter in areas such as grilles, lamps and front bumpers or in the areas of the lamps), the laser radar is directly exposed outwards, and objects or parts cannot be arranged on the front side of the laser radar. If an object (mostly, a transparent object) is arranged outside the laser radar, an opening is usually formed in an area corresponding to the laser radar on the object on the outside, so that no object is shielded on the front side of the laser radar.

However, the waves emitted by the laser radar are waves of the laser radar wave band, and the waves are greatly influenced by factors such as weather and external environment, for example, when dust, rainwater, snow, bird droppings, sand and dust of the external environment are attached to a window sheet (the outermost part of the laser radar module itself, which can be regarded as a lens of the laser radar module) of the laser radar, the functions, quality, wave transmittance, information accuracy and the like of the laser radar are seriously influenced, and the influence is more serious with the elapse of time, and even the laser radar module is completely failed.

Disclosure of Invention

In view of the shortcomings of the prior art, it is an object of the present invention to provide an outer lens suitable for lidar integration.

According to the invention, the outer lens suitable for laser radar integration comprises: an outer lens body including a lens body and a transmission body integrally formed;

the transmission body is a laser radar and a projection area of a laser radar emitting area on the outer lens body along an emitting direction;

the transmission body is provided with a first lens outer side face and a first lens inner side face; an antireflection film is arranged on the outer side face of the first lens and/or the inner side face of the first lens;

the laser radar is arranged on one side of the inner side surface of the outer lens body.

Preferably, an outer antireflection film is arranged on the outer side face of the first lens, and an inner antireflection film is arranged on the inner side face of the first lens.

Preferably, the first hardened coating is disposed on the outer side surface of the first lens;

the outer antireflective film is disposed on the first hardened coating, which is located between the transmitter and the outer antireflective film.

Preferably, the thickness of the outer lens body is equal to or less than 3mm.

Preferably, the outer lens body has a radius of curvature identical to a radius of curvature of the window piece of the laser radar.

Preferably, the lens body is provided with a second lens outer side surface and a second lens inner side surface;

be provided with second sclerosis coating on the second lens lateral surface, be provided with first antifog coating on the second lens lateral surface, the lenticle is located second sclerosis coating with between the first antifog coating.

Preferably, the first lens outer side surface and the second lens outer side surface constitute an outer side surface of the outer lens body;

the inner side surface of the first lens and the inner side surface of the second lens form the inner side surface of the outer lens body;

the first hardened coating and the second hardened coating constitute a hardened coating of the outer lens body.

Preferably, the inner antireflection film is arranged on a second antifogging coating, and the second antifogging coating is positioned between the inner antireflection film and the transmission body;

the first anti-fog coating and the second anti-fog coating form the anti-fog coating of the outer lens body.

Preferably, the first hardened coating and the second hardened coating are arranged on the outer lens body in a flow coating or spraying manner;

the outer antireflection film and the inner antireflection film are coated by adopting any one of the following coating processes: spraying, spraying and vacuum evaporation coating.

Preferably, the wavelengths λ of the laser radar transmission waves are the same, the number of layers of the antireflection film is different, and when the refractive index n of the outer lens body is larger: the more the number of the layers of the antireflection film is, the larger the thickness of each layer of the antireflection film is;

the refractive index n of the outer lens body is the same, the wavelength lambda of the laser radar emission wave is different, and when the number of layers of the antireflection film is not changed: the larger the wavelength lambda of the wave emitted by the laser radar is, the larger the thickness of each layer of antireflection film is.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the laser radar is integrated in the car lamp, so that the problem that the laser radar is influenced by the outside is solved;

2. the invention solves the problem of laser radar laser reflection loss and reduces reflection loss by adopting the structure that the antireflection film coating is arranged in or outside the lens;

3. by adopting the structure that the antireflection film coatings are arranged on the inner side and the outer side of the lens, the reflection loss is reduced, and the wave transmittance is improved by about 4 percent on the basis of the loss existing when the original lens is penetrated;

4. according to the invention, through the structure that the curvature radius of the lens at the front end of the radar is kept consistent with that of the window sheet of the laser radar, the problem that the distance measurement capability of a large field angle is reduced is solved, and the effect of keeping the whole distance measurement capability is achieved;

5. the invention improves the wave transmittance of the lens, reduces reflection, absorption and scattering, and ensures that the wave transmittance of laser waves is not damaged after the laser radar is integrated in the lamp.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic diagram of an application of an outer lens suitable for lidar integration of the present invention;

FIG. 2 is a schematic structural diagram of an outer lens body according to the present invention;

FIG. 3 is a first schematic view of a configuration of a laser radar integrated outer lens of the present invention as a highlighting transmitter;

FIG. 4 is a second schematic view of a configuration of a highlighted projector as an outer lens suitable for lidar integration in accordance with the present invention;

fig. 5 is a third schematic structural diagram of the outer lens suitable for integration of lidar in the present invention as a highlighted transmissive body.

The figures show that:

outer lens body 1 first lens inner side surface 1022

First hardened coating 1023 of lens body 101

Outer anti-reflection film 1024 of second hardened coating 1011

Antireflection film 1025 in first antifogging coating 1012

Transmitter 102 lidar 2

First lens outer side 1021 window sheet 201

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

Example 1:

as shown in fig. 1 to 5, the present embodiment provides an outer lens suitable for lidar integration, including: the outer lens comprises an outer lens body 1, wherein the outer lens body 1 comprises a lens body 101 and a transmission body 102 which are integrally formed, the transmission body 102 is a projection area of the emergent areas of the laser radar 2 and the laser radar 2 on the outer lens body 1 along the emergent direction, and a first lens outer side surface 1021 and a first lens inner side surface 1022 are arranged on the transmission body 102; an antireflection film is arranged on the outer side surface 1021 and/or the inner side surface 1022 of the first lens body, and the laser radar 2 is arranged on one side of the inner side surface of the outer lens body 1, namely, the laser radar 2 is integrated in the car lamp.

An outer antireflection film 1024 is provided on the first lens outer side surface 1021, and an inner antireflection film 1025 is provided on the first lens inner side surface 1022. First hardened coating 1023 is disposed on first lens outer side 1021, outer antireflection film 1024 is disposed on first hardened coating 1023, and first hardened coating 1023 is disposed between transmitter 102 and outer antireflection film 1024.

The first hardening coating 1023 is arranged on the outer side surface 1021 of the first lens, so that the strength of the material can be enhanced, the material is not easy to scratch, and the smooth surface can reduce the diffuse scattering of light. Outer antireflection film 1024 is provided on first hard coat 1023, which can enhance wave-transmitting rate and reduce reflection as much as possible.

The lens body 101 is provided with a second lens outer side face and a second lens inner side face, a second hardened coating 1011 is arranged on the second lens outer side face, a first anti-fog coating 1012 is arranged on the second lens inner side face, and the lens body 101 is located between the second hardened coating 1011 and the first anti-fog coating 1012 and can prevent water vapor from attaching to the lens to influence laser emission.

The first lens outer side surface 1021 and the second lens outer side surface constitute an outer side surface of the outer lens body 1, the first lens inner side surface 1022 and the second lens inner side surface constitute an inner side surface of the outer lens body 1, and the first hardened coating 1023 and the second hardened coating 1011 constitute a hardened coating of the outer lens body 1.

The thickness of the outer lens body 1 is less than or equal to 3mm, and the influence of the lens on the wave transmittance can be reduced. The radius of curvature of the outer lens body 1 is the same as the radius of curvature of the window piece 201 of the laser radar. The outer lens body 1 is made of resin, is low in price and light in weight, is easy to bend and model, and is not easy to hurt people when collision occurs.

The first hardened coating 1023 and the second hardened coating 1011 are disposed on the outer lens body 1 by flow coating or spray coating. The outer antireflection film 1024 and the inner antireflection film 1025 are coated by any one of the following coating processes: spraying, spraying and vacuum evaporation coating.

When the lens is seen from the inner side to the outer side, if the two sides are low and the middle is high, the lens is defined as a lens with a convex radian, and when the lens is seen from the inner side to the outer side, if the two sides are high and the middle is low, the lens is defined as a lens with a concave radian;

when the antireflection film is coated on the outer side surface of the lens with the convex radian, the coating process adopts curtain coating or spray coating;

when the antireflection film is coated on the inner side surface of the lens with the convex radian, the coating process adopts spraying;

when the antireflection film is coated on the outer side surface of the lens with the concave radian, the coating process adopts spraying;

when the antireflection film is coated on the inner side surface of the lens with the concave radian, the coating process adopts curtain coating or spray coating.

The inner antireflection film 1025 is provided on the second antifogging coating layer, which is located between the inner antireflection film 1025 and the transmission body 102, and the first antifogging coating layer 1012 and the second antifogging coating layer constitute an antifogging coating layer of the outer lens body 1.

The wavelength lambda of the wave emitted by the laser radar 2 is the same, the number of layers of the antireflection film is different, and when the refractive index n of the outer lens body 1 is larger: the larger the number of antireflection film layers, the larger the thickness of each antireflection film layer. The refractive index n of the outer lens body 1 is the same, the wavelength lambda of the emitted wave of the laser radar 2 is different, and when the layer number of the antireflection film is not changed: the larger the wavelength lambda of the wave emitted by the laser radar 2 is, the larger the thickness of each antireflection film is.

If the antireflection film is arranged in a non-LIDAR (laser radar) area, namely a light area required by vehicle lamp regulations such as lighting, signal and retro-reflector areas of a vehicle lamp, because the antireflection film has different effects on different wave bands, when the vehicle lamp is designed, and the vehicle lamp and the laser radar are integrated and applied, the antireflection film is arranged for enhancing and helping the wave transmission rate of the LIDAR area, but the antireflection film in a wave band beneficial to the LIDAR area can have negative effects on the requirements of the light area of visible light bands of the vehicle lamp lighting, the signal and the retro-reflector areas, and the like, the antireflection film has the effects of enhancing and helping the wave transmission rate but inhibiting and weakening the visible light area in the LIDAR wave band area, so that the lighting, the signal and the retro-reflector of the vehicle lamp cannot meet the optical requirements of the regulations, and the antireflection film is not arranged in the non-LIDAR area.

The wave of the laser radar is very sensitive to weather and external environment factors, and the laser radar is arranged on the inner side of the outer lens of the car lamp in the design of the embodiment, namely the outer side of the laser radar is provided with the part of the outer lens of the car lamp, so that the outer lens of the car lamp and the shell of the car lamp are completely sealed by adopting various types of glue coating or various types of welding processes. Complete leakproofness can be guaranteed to the outer lens of car light, sets up the lidar module in it and can keep apart with external environment and weather completely, and the lidar module can not receive the influence and the interference of weather and external environment, can be long-time, high accuracy, carry out the implementation of lidar function steadily.

The laser radar sensor is integrated in the car lamp, the development trend of the car manufacturing industry and the market demand are developed towards the automatic driving of the multiple sensors at a high speed, the problem that the shape of the whole car is damaged by the arrangement of the sensors in the development process exists, the arrangement of the laser radar is the most painful in the shape of the whole car in the existing sensors, and the integration of the laser radar into the lamp is a good arrangement method. However, the integration of the lidar in the lamp requires consideration of: a. the temperature of a light source in the lamp is high, and the heat is generated due to high power of the lamp, so that how to dissipate heat needs to be considered; b. the light-emitting surface of the laser radar cannot be shielded, and although the outer lens of the conventional lamp is transparent, the curvature radius, the thickness and various coatings of the outer lens surface can cause light type change and light wave loss due to penetration of laser; c. temperature differences within and outside the lamp cavity tend to cause fogging and water beading of the inner surface of the outer lens, which also affects the light pattern and light wave penetration.

When solving the problem that laser radar is influenced by weather and external environment, the laser radar module outside has set up this article of outer lens of car light, although outer lens is transparent part, but still can reduce the penetration rate of the detection ripples that laser radar sent, this embodiment design is for guaranteeing the penetration rate of the detection ripples that laser radar sent this moment, guarantee the wave transmissivity that laser radar sent ripples when outgoing and pass outer lens of car light promptly, this embodiment adopts and sets up the antireflection coating at outer lens of car light, so set up, the problem that laser radar sent ripples is influenced by weather and external environment factor has been solved promptly, guarantee the penetration rate that laser radar sent ripples when passing outer lens simultaneously, make the laser radar module of integrated in car light can high accuracy, high stability, the realization laser radar's of high integration detection and recognition function.

This embodiment has solved the dancing and the drop of water problem of outer lens internal surface through setting up antifog coating.

Example 2:

as shown in fig. 1 to 5, the present embodiment provides an outer lens suitable for lidar integration, including: the outer lens body 1, outer lens body 1 include the lens body 101 and the transmission body 102 that integrated into one piece set up, and transmission body 102 is lidar 2 and the projecting area of lidar 2 on outer lens body 1 along the outgoing direction.

The transmissive body 102 is provided with a first lens outer surface 1021 and a first lens inner surface 1022. The lens body 101 is provided with a second lens outer surface and a second lens inner surface. The first lens outer side surface 1021 and the second lens outer side surface constitute an outer side surface of the outer lens body 1, and the first lens inner side surface 1022 and the second lens inner side surface constitute an inner side surface of the outer lens body 1.

Inner antireflection film 1025 is disposed on first lens inner side surface 1022.

In order to prevent the water mist from condensing in the area and causing condensation defects, an anti-fog device or measures, such as a drying agent, a ventilation pipeline for assisting air circulation or an active air circulation component such as a fan, can be arranged at the laser radar element or in the surrounding area.

Example 3:

this example is different from example 2 in that the second lens inner side surface is provided with an antifogging coating.

Example 4:

the difference between this embodiment and embodiment 3 is that the inner side surface of the entire outer lens body 1 is provided with an antifogging coating, and an inner antireflection film 1025 is provided on the antifogging coating in a region corresponding to the first lens inner side surface 1022.

Example 5:

this embodiment differs from embodiment 4 in that the entire outer side surface of the outer lens body 1 is provided with a hardened coating.

Example 6:

the difference between this embodiment and embodiment 5 is that an outer antireflection film 1024 is disposed on the hardened coating in the region corresponding to the outer side surface 1021 of the first lens element.

Example 7:

the difference between this embodiment and embodiment 2 is that the entire outer side surface of the outer lens body 1 is provided with a hardened coating, and an outer antireflection film 1024 is disposed on the hardened coating in a region corresponding to the outer side surface 1021 of the first lens.

Example 8:

the present embodiment is different from embodiment 3 in that a hardening coating is disposed on the outer side surface of the entire outer lens body 1, and an outer antireflection film 1024 is disposed on the hardening coating in a region corresponding to the outer side surface 1021 of the first lens.

Example 9:

the present embodiment is different from embodiment 4 in that a hardening coating is disposed on the outer side surface of the entire outer lens body 1, and an outer antireflection film 1024 is disposed on the hardening coating in a region corresponding to the outer side surface 1021 of the first lens.

Example 10:

this embodiment differs from embodiment 3 in that the entire outer side surface of the outer lens body 1 is provided with a hardened coating.

Example 11:

those skilled in the art will understand this embodiment as a more specific description of embodiment 1.

This embodiment provides an outer lens suitable for laser radar is integrated, and the outer lens of this embodiment can keep the performance that laser radar placed behind the outer lens of whole lamp not influenced, influences optical properties and mainly has these four following factors: the thickness, radius of curvature, tilt angle with respect to the lidar, and wave-transparency of the outer lens.

Thickness of the whole lamp outer lens to laser wavelength: for example, 840nm, 905nm and 1550nm, have a direct effect on the transmission, which decreases with increasing thickness, for example 3mm, and 5% lower, if conditions allow, the outer lens is designed as thin as possible, within 3mm.

Designing the distance between the whole lamp outer lens and the laser radar: the optical envelope of the laser radar is required to be ensured not to be blocked, the working interference of stray light generated by the whole lamp outer lens on the laser radar is also avoided, the integrity of a good field angle is considered, the outer lens at the front end of the laser radar is specially processed to enable the laser radar to have the good field angle, and the requirements on the whole lamp optics are reserved for other parts (such as the outer lens, the inner lens and the like of the whole lamp). Fresnel reflection law states that the larger the incident angle of light ray, the greater the reflection, and the radius of curvature of the entire lamp outer lens is designed to satisfy as much as possible the condition that the incident angle of the laser ray on the entire lamp outer lens in all envelope regions is less than 30 degrees (optimally 0 degrees, i.e. to ensure complete penetration without loss), to reduce reflection and improve transmittance. In other embodiments, the radius of curvature of the entire outer lens and window piece 201 of lidar 2 may be maintained consistent. When laser is emitted from laser radar 2 and is passed through whole lamp outer lens, some can be reflected back internal system and form stray light, whole lamp outer lens's overall arrangement direction must make stray light can not get into and receive photodetector, otherwise can cause and receive false signal, forms the false alarm, influences laser radar 2's detection accuracy and range finding ability. Therefore, the layout angle between the entire lamp outer lens and the lidar is designed accordingly according to the lidar transmitting and receiving system.

The outer layer (i.e., the outer side surface 1021) of the outer lens (i.e., the transmitter 102) at the front end of the laser radar is coated with a surface hardening coating (i.e., the first hardening coating 1023) to enhance the strength of the material, the material is not easy to scratch, the surface is smooth and flat, the diffuse scattering of light can be reduced, the hardening coating is coated with an antireflection film (i.e., an outer antireflection film 1024) to enhance the wave transmission rate and reduce the light loss as much as possible, and the inner layer (i.e., the inner side surface 1022) of the lens can be coated with an antifogging coating (i.e., a second antifogging coating) to prevent water vapor from attaching to the lens to influence laser emission.

The inner side and the outer side of the outer lens are provided with antireflection films:

the outer lens part at the front end of the laser radar is provided with an outer lens outer side surface and an outer lens inner side surface, the outer side surface of the outer lens is coated with a hardened coating, the hardened coating is coated with an outer lens outer surface antireflection film, and the inner side surface of the outer lens is coated with an inner lens surface antireflection film;

a. the outer lens at the front end of the laser radar is a part of the outer lens of the whole lamp, and the material of the outer lens of the whole lamp is generally resin, because the resin has the advantages of low price, light weight, easy bending modeling and difficult injury to people when collision occurs compared with glass. Therefore, the prior outer lens of the whole lamp can select resin to replace glass; PMMA material and PC material can be selected;

b. the upper surface of the outer side surface of the lens is coated with the hardened coating firstly, so that the outermost side surface of the outer lens is hardened to increase the strength and hardness of the lens, the problems that the outer lens is damaged by smashing, cracks, optical failure, sealing failure and the like when an object touches the outer surface of the outer lens are avoided, and the hardened coating covers the outer side surface of the outer lens in a whole area mode, as shown in fig. 4;

c. in a preferred embodiment, the hardened coating is curtain coated, so that the uniformity of the thickness and the distribution area can be realized, the problem of coating the antireflection film caused by flow marks and uneven coating is avoided, and the antireflection film is ineffective or the efficacy of the antireflection film is reduced;

d. the anti-reflection film on the outer surface of the lens is coated on the hardened coating on the outer surface of the lens, so that the anti-reflection film coating is ensured to be arranged on the intersection part of the optical envelope of the laser radar and the outer lens part at the front end of the laser radar. In another mode, the antireflection film on the outer surface of the lens is coated on the hardened coating on the outer surface of the local lens, and the 'upper surface of the hardened coating on the outer surface of the local lens' refers to a projection direction area in front of a laser radar and a laser emergent area of the laser radar;

e. as shown in fig. 5, the antireflection film on the inner surface of the lens is directly coated on the inner surface of the lens, and other areas on the inner surface of the lens outside the whole lamp can be coated with an antifogging coating according to antifogging requirements, so that in order to prevent the laser penetration loss and light path deformation caused by fogging on the inner surface of the lens, a waterproof breathable film can be attached around the laser radar to block water vapor generated by heat of a light source and protect the inner surface of the lens from fogging;

f. in the prior case, the antireflection film is partially coated on the inner surface of the lens, the antireflection film is coated on the inner surface of the lens, the coating on the inner surface of the lens refers to the area of the laser radar and the projection direction in front of the laser emitting area of the laser radar, and other lens areas are coated with the antifogging coating as described above; the antireflection film is also called as an antireflection film, mainly reduces reflection on the surface of an element, light has wave particle diphasic, the principle of the antireflection film is that the light is considered as a wave, when the light irradiates an interface of two transparent media, the light is irradiated from a light-thinning medium to a light-dense medium, reflected light has half-wave loss, the refractive index of the material of the antireflection film is between air and resin, so that half-wave loss occurs on the front surface and the back surface of the antireflection film, and according to energy conservation, destructive interference is utilized to reduce the reflectivity and increase the transmitted energy. When the antireflection film is arranged on the outer side of the lens, the antireflection film is better arranged on the outer side of the hardened coating layer than the inner side of the hardened coating layer, the refractive index of the antireflection film is smaller than that of the hardened coating layer, destructive interference of the system is considered on the whole, reflectivity is reduced, and transmitted energy is increased;

g. the thickness of the antireflection film can be calculated by the relationship between the optical path difference and the destructive interference: h = lambda ₀ /4n,λ ₀ Is the wavelength in vacuum, and n is the refractive index of the antireflection film medium;

h. the double-sided plating of the antireflection film can improve the wave transmission rate by about 4 percent on the basis of the loss existing in the original transmission lens, namely, compared with the loss existing in the existing transmission lens, the antireflection film can reduce the loss value. When laser penetrates through the lens, the wave-transmitting rate loss exists, and the anti-reflection film can reduce the loss value and reduce the wave-transmitting rate loss.

In the scheme, the contents of a to d, f and g are the same as those in the scheme, and in the scheme, the inner surface of the lens is not plated with an anti-fog coating, and the inner surface of the whole outer lens is plated with the anti-fog coating to prevent the inner part of the lamp from being fogged.

The antireflection film used in this embodiment may be formed by a coating process such as curtain coating, spray coating, or ion sputtering. The antireflection film needs to be provided with a wall thickness and be uniformly distributed, otherwise, the light type can be changed, and the point cloud arrangement can be irregular. Especially, when the spraying process is used, the uniformity of the wall thickness and distribution of the sprayed antireflection film needs to be ensured. The antireflection film can be coated on a plane or a plane with radian, namely, the outer lens can be wholly or partially a plane or wholly or partially a plane with radian.

When the antireflection film is coated on the outer side surface of the lens with the convex radian, the process is preferably performed by spraying and spraying, and when the antireflection film is coated on the inner side surface of the lens with the convex radian, the process is preferably performed by spraying, so that the problems of uneven thickness and distribution of the antireflection film possibly caused by spraying at the moment are avoided; when the antireflection film is coated on the outer side surface of the lens with the concave radian, the process is preferably spray-coated, so that the problem of uneven thickness and distribution of the antireflection film possibly caused by spray coating at the moment is avoided. When the coating is coated on the inner side surface of the lens with a concave radian, the process is preferably curtain coating and spray coating.

In the above scheme, the antireflection film is disposed on the outer side and the inner side of the lens in a coating manner by a process, and the other optional arrangement mode of the antireflection film is that the antireflection film is a film product, but not a coating, and when the antireflection film is applied and selected, the film product of the corresponding antireflection film is selected according to specific parameters and performances (such as transmittance, adaptive band and the like) required as well as parameters such as thickness, size and the like, and is attached to all or partial areas on the outer side and the inner side of the lens.

When the antireflection film is only arranged in a local area on the outer side or the inner side of the lens, the antireflection film is configured and designed according to a required wavelength band, namely the wavelength band of the laser radar is mainly used, the difference between the wavelength band and the wavelength band of sunlight is large, and the sunlight is reflected by most parts and is reduced in energy penetration when passing through the antireflection film, so that sunlight focusing is avoided. Therefore, the arrangement of the antireflection film in the local area can ensure that the normal work of the functions of the peripheral automobile illumination area is not influenced, and can also avoid the problem that peripheral parts are baked out or burnt out due to insufficient heat bearing capacity caused by sunlight focusing in the laser radar function area. The film coefficients are designed according to different wave bands, and the two sides of the outer side of the hardened coating can influence the function of normal light illumination signals.

The existing laser radar adopts glass as an outer lens of the laser radar, the outer lens of the laser radar directly emits as the outermost medium in the application of the laser radar, and the outer side of the outer lens of the laser radar is not provided with a lens or other media (such as an outer lens of a car lamp). In the field related to optical lenses, the laser radar itself adopts glass as its outer lens. In the two cases, the outermost medium for the laser radar to emit and receive feedback is glass.

In the field of optical lenses (different from car lamps), the optical lenses are systems for passively receiving external light, the integrated laser radar module of the car lamp is light of a detection waveband actively emitted by a laser radar, the wavelength lambda of the optical lenses is different from the wavelength lambda of the car lamp module of the integrated laser radar of the car lamp, the optical lenses adopt glass as outer lenses, the car lamp module of the integrated laser radar adopts plastic materials such as PC as the outer lenses, the refractive index of PC materials is greater than that of glass materials, namely, nPC > nGlass, n is different, and the application of the antireflection film in the two fields is completely different.

In the existing car lamp, especially the car lamp integrating the detection function of laser radar and the regulation optical functions of illumination, signals and retro-reflectors, the outer lens of the car lamp is made of plastic material, such as Polycarbonate (PC), the refractive index of the material is greater than that of glass, taking PC as an example, that is, nPC > nGlass, and aiming at the condition that the refractive index of the PC material is different from that of glass and other aspects of car lamp design, the film system parameters of the antireflection film need to be specially designed.

In addition, the glass does not generate bubbles at high temperature, so the antireflection film can be directly arranged without hardening the coating, but the plastic such as PC and the like generates bubbles at high temperature, so the antireflection film cannot be well adhered to the outer lens material of the PC, and the bubbles cannot be well adhered to the outer lens material of the PC easily.

The glass used as the outer lens of the car lamp has the following defects: a. the weight of the glass outer lens is larger than that of the plastic outer lens, and the glass outer lens is heavy, so that the oil consumption and the energy consumption are serious; b. due to the material characteristics and process limitations of glass, the molding surface of the automobile lamp is greatly limited when the glass is used as an outer lens of the automobile lamp, and the molding design of the existing automobile lamp is more and more complex, so that the molding of the automobile lamp with large radian, large inclination angle and abrupt change of the shape cannot be achieved; c. the outer lens of the glass car lamp can not be used as an anti-fog coating, and the anti-fog coating can not be used when the car lamp with serious water mist problem is designed, so that the water mist problem can not be solved, and the water mist problem is also an important appearance defect for car lamp functions, host factories and car purchasing customers; d. the outer lens of the car lamp made of glass inevitably has thick thickness and poor appearance due to the property of the glass material and the forming process.

The car light uses plastics (such as PC, PMMA) as an outer lens, taking PC as an example, the PC has the following advantages: a. the weight of the PC is less than that of the glass, so that the oil consumption and the energy consumption are low, and the energy is saved; b. the PC is suitable for various vehicle lamp molding surfaces, and can meet the requirements even if the vehicle lamp molding surfaces are complex, large in radian, large in inclination angle and suddenly changed in molding; c. the PC outer lens can be used as an anti-fog coating, so that the problem of water fog is effectively solved, the function is ensured, and the appearance defects are reduced; d. the outer side of the PC outer lens can also be used as a hardening coating.

In the embodiment, the antireflection film is used for the outer lens of the automobile lamp, and the laser radar module is integrated on the inner side of the outer lens of the automobile lamp. In the design of a film system, lambda is the same, and n is different: when n is larger, the layer number is larger, and the thickness of each layer of the film system is also larger; in the design of the film system, n is the same, and lambda is different: the number of layers is constant, but the larger the λ, the larger the thickness of each layer.

The parameter formula of the antireflection film system design is as follows: substrate/(LH) ^ nL/Air;

substrate is a Substrate, which for the purposes of this example is understood to be a plastic, such as PC; parametric superstrate, material refractive index n of this example is different from glass; l in (LH) is a low reflective layer substance, and H is a high reflective layer substance; n to the power of N indicates how many layers there are; (LH) ^ nL rightmost L tends to mean that the outermost layer of the part is L, a low reflector material; air is Air; each layer has a thickness L/H ≈ lambda/4.

Important parameters of the antireflection film include wave transmittance and reflectivity: the wave-transparent rate is more than 95 percent, and the reflectivity is less than 1 percent or 0.1 percent. According to the requirement, the number of layers required by the film system design of the antireflection film can be adjusted, specific parameters of each layer of high-reflection substances and low-reflection substances are designed, the layers can be different, the layers are designed in a correlation mode, the thickness (L/H) of each layer is theoretically approximately equal to lambda/4, and the thickness can be actually changed according to each layer.

For different angular ranges, such as: the wave-transparent rate is required to be more than 96% at 0 degrees, namely the position right ahead, and the wave-transparent rate is required to be more than 92% in the angle interval of 0-20 degrees.

The outgoing detection wave of the laser radar module has a certain angle area range, the wave transmission rate requirements in different angle ranges can be different, and overall, the requirement of the dead ahead is the highest, and the larger the angle is, the lower the requirement can be.

For 905nm as an example, the wavelength of the outgoing light of the laser radar module needs to be measured to obtain a wave transmittance between 850 nm and 950nm, so as to prevent the suppression effect on light waves with other functions, such as illumination of visible light, signals, retro-reflectors and other wave bands.

The curvature radius of the existing laser radar, whether the outer lens of a laser radar module or the lens of an optical lens in other fields, is large and is approximately planar, an antireflection film can be arranged on the inner layer or the outer layer, and if the curvature is small, the existing laser radar is difficult to uniformly and effectively arrange on the lens by a process.

Considering that the antireflection film is soft and is easily damaged and failed when being arranged on the outer layer, the antireflection film is difficult to pass material tests such as illumination, corrosion, impact and the like when being arranged on the outer side. Therefore, the antireflection film is disposed on the inner layer of the lens of the laser radar module.

The scheme of the embodiment realizes the scheme from the inner layer to the outer layer coated with the outer layer, breaks through the limitation that the existing curvature is nearly planar and is very large, and the curvature of the outer lens of the vehicle lamp of the embodiment is smaller than that of the outer lens of the existing laser radar module or the optical lens.

The outer side face of the outer lens of the automobile lamp is coated with the antireflection film, the antireflection film is arranged on the convex surface, and the antireflection film can be uniformly coated on the outer side face of the outer lens by using a curtain coating process. If the outer lens is a concave surface or a convex surface, the antireflection film is uniformly coated on the outer side surface of the outer lens by using a spraying process.

The outer side of the outer lens of the automobile lamp is coated with the outer lens hardening coating of the automobile lamp, and then the antireflection film is arranged on the outer side of the outer lens of the automobile lamp, so that the problem that the antireflection film is very soft and is easy to damage and lose efficacy can be solved.

The inner layer of the outer lens can be completely used for coating an anti-fog coating, an antireflection film is arranged on the anti-fog coating in the area corresponding to the laser radar, the detection wave transmittance of the laser radar can be improved most effectively, the anti-fog coatings are arranged in the other areas, and the wave transmittance and the anti-fog function are guaranteed. Above-mentioned setting, there is some position region not to have antifog coating, especially to the regional antifog relatively poor of laser radar, the probability that water smoke problem influences LIDAR detection wave function exists, and this embodiment has realized that the antireflection coating breaks through from inlayer to skin, can make the inlayer be used for setting up antifog coating completely, and the outer antireflection coating that sets up promptly guarantees the wave transmissivity, and the inlayer sets up antifog coating and guarantees no water smoke problem, and the flexibility is higher.

The invention solves the problem of laser radar laser reflection loss and reduces reflection loss by adopting the structure that the antireflection film coating is arranged in or outside the lens.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (10)

1. An outer lens adapted for lidar integration, comprising: an outer lens body (1), the outer lens body (1) comprising a lens body (101) and a transmission body (102) which are integrally formed;

the transmission body (102) is a laser radar (2) and a projection area of an emergent area of the laser radar (2) on the outer lens body (1) along the emergent direction;

the transmission body (102) is provided with a first lens outer side surface (1021) and a first lens inner side surface (1022); an antireflection film is arranged on the first lens outer side surface (1021) and/or the first lens inner side surface (1022);

the laser radar (2) is arranged on one side of the inner side face of the outer lens body (1).

2. The outer lens for lidar integration of claim 1, wherein an outer antireflective coating (1024) is disposed on the first lens outer side surface (1021) and an inner antireflective coating (1025) is disposed on the first lens inner side surface (1022).

3. The outer lens adapted for lidar integration of claim 2, wherein the first hardened coating (1023) is disposed on the first lens outer side surface (1021);

the outer antireflective film (1024) is disposed on the first hardened coating (1023), the first hardened coating (1023) being located between the transmitter (102) and the outer antireflective film (1024).

4. Outer lens for lidar integration according to claim 1, wherein the thickness of the outer lens body (1) is equal to or less than 3mm.

5. Outer lens for lidar integration according to claim 1, characterized in that the radius of curvature of the outer lens body (1) is the same as the radius of curvature of the window plate (201) of the lidar (2).

6. The outer lens for lidar integration according to claim 1, wherein a second lens outer side and a second lens inner side are provided on the lens body (101);

be provided with second sclerosis coating (1011) on the second lens lateral surface, be provided with first antifog coating (1012) on the second lens lateral surface, the lenticle (101) is located second sclerosis coating (1011) with between first antifog coating (1012).

7. The outer lens for lidar integration according to claim 6, wherein the first lens outer side (1021) and the second lens outer side constitute an outer side of the outer lens body (1);

the first lens inner side surface (1022) and the second lens inner side surface constitute an inner side surface of the outer lens body (1);

the first hardened coating (1023) and the second hardened coating (1011) constitute hardened coatings of the outer lens body (1).

8. The outer lens suitable for lidar integration of claim 7, wherein the inner antireflective film (1025) is disposed over a second anti-fog coating, the second anti-fog coating being between the inner antireflective film (1025) and the transmissive body (102);

the first anti-fog coating (1012) and the second anti-fog coating form an anti-fog coating of the outer lens body (1).

9. Outer lens suitable for lidar integration according to claim 1, wherein the first hardened coating (1023) and the second hardened coating (1011) are disposed on the outer lens body (1) in a curtain or spray manner;

the outer antireflection film (1024) and the inner antireflection film (1025) are coated by adopting any one of the following coating processes: spraying, spraying and vacuum evaporation coating.

10. The outer lens suitable for lidar integration according to claim 1, wherein the wavelengths λ of the emitted waves of the lidar (2) are the same, the number of layers of the antireflection film is different, and the larger the refractive index n of the outer lens body (1) is: the more the number of layers of the antireflection film is, the greater the thickness of each layer of the antireflection film is;

the refractive index n of the outer lens body (1) is the same, the wavelength lambda of the wave emitted by the laser radar (2) is different, and when the number of layers of the antireflection film is unchanged: the larger the wavelength lambda of the wave emitted by the laser radar (2), the larger the thickness of each antireflection film.

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