CN115571043A - Motor vehicle headlamp with a radar radiation module - Google Patents

Motor vehicle headlamp with a radar radiation module Download PDF

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Publication number
CN115571043A
CN115571043A CN202210682945.0A CN202210682945A CN115571043A CN 115571043 A CN115571043 A CN 115571043A CN 202210682945 A CN202210682945 A CN 202210682945A CN 115571043 A CN115571043 A CN 115571043A
Authority
CN
China
Prior art keywords
radar
motor vehicle
radiation
functional layer
visible light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210682945.0A
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Chinese (zh)
Inventor
约翰内斯·布里尔
克里斯蒂安·布赫伯格
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marelli Automotive Lighting Reutlingen Germany GmbH
Original Assignee
Marelli Automotive Lighting Reutlingen Germany GmbH
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Filing date
Publication date
Application filed by Marelli Automotive Lighting Reutlingen Germany GmbH filed Critical Marelli Automotive Lighting Reutlingen Germany GmbH
Publication of CN115571043A publication Critical patent/CN115571043A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/0029—Spatial arrangement
    • B60Q1/0041—Spatial arrangement of several lamps in relation to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/0017—Devices integrating an element dedicated to another function
    • B60Q1/0023—Devices integrating an element dedicated to another function the element being a sensor, e.g. distance sensor, camera
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/06—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle
    • B60Q1/08—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1415—Dimming circuits
    • B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
    • B60Q1/143—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic combined with another condition, e.g. using vehicle recognition from camera images or activation of wipers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/46—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for giving flashing caution signals during drive, other than signalling change of direction, e.g. flashing the headlights or hazard lights
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3225—Cooperation with the rails or the road
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3283—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle side-mounted antennas, e.g. bumper-mounted, door-mounted
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
    • H01Q15/08—Refracting or diffracting devices, e.g. lens, prism formed of solid dielectric material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
    • H01Q19/062—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens for focusing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
    • H01Q19/067—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens using a hologram
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
    • H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
    • H01Q19/134—Rear-feeds; Splash plate feeds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/05—Special features for controlling or switching of the light beam
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S2013/9327—Sensor installation details
    • G01S2013/93277—Sensor installation details in the lights

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Security & Cryptography (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The invention relates to a motor vehicle headlight having a device for emitting visible light and having a radar radiation module having a radar radiation detector and a radar functional element, wherein the radar functional element is provided to deflect incident radar radiation onto the radar radiation detector in a beam-forming manner, and wherein the radar functional layer has a lower transparency for radar radiation than for visible light and intersects a beam of visible light. The motor vehicle headlamp is characterized in that at least one visible light beam is a light beam of a signal light function.

Description

Motor vehicle headlamp with a radar radiation module
Technical Field
The invention relates to a motor vehicle headlight having a device for emitting at least one visible light beam and having a radar radiation module.
Background
Such a motor vehicle headlight is known from fig. 6 of document US 2011/0279304 A1.
Radar radiating modules are used in motor vehicles to monitor driving situations and to provide driver support when driving the motor vehicle and/or when autonomously driving. For example, support is made by measuring the distance to the vehicle travelling ahead and possibly automatically making constant maintenance of such distance by intervening on the drive train and/or the brakes.
Motor vehicle headlamps are suitable for incorporating radar sensors, since they provide in principle good emission conditions and good reception conditions as openings in the predominantly metal bodywork. This is due to the nature of the headlamp material (usually plastic) and the absence of body paint in these openings. The main components of the radar radiation module are, in addition to the electronic components and the housing, a radar radiation emitter and a radar radiation detector. In the case of a free-radiation implementation, the radar radiation detector can only receive the part that falls directly into the radar radiation detector. In embodiments with a lens system, the aperture of the lens is the limiting element.
Therefore, solutions are of interest that can increase the received power of a radar module integrated into a motor vehicle headlamp compared to a free-radiating embodiment.
A motor vehicle headlight known from US 2011/0279304 A1 has a reflector which reflects millimeter waves and which is transparent to visible light. The reflector projects into the dipped headlight beam from one side, wherein the reflector extends transversely through the optical axis of the dipped headlight beam. A reflector reflecting millimeter waves and being transparent to visible light has a network-structured vapor-deposited metal thin film on the front side of a colorless transparent plastic plate. The film is a layer that reflects radar radiation.
Known motor vehicle headlamps have, in particular, a radar module which is configured to emit radar radiation. The motor vehicle headlamp also has a radar radiation detector and a radar function in the form of the aforementioned reflector. The radar radiation detector also has a radiation sensitive detector surface. The radar functional element is arranged to deflect radar radiation incident on the radar functional layer in a beam-focused manner onto the radar radiation detector. The radar functional layer has a lower transparency for radar radiation than for visible light and is shaped and arranged such that it intersects the beam of visible light.
According to the initially mentioned US 2011/0279304 A1, paragraph 25, the radar functional layer protrudes beyond the optical axis into the low beam so that more radar radiation can be used. Even if the radar functional layer allows visible light to pass through, the luminous flux of the dipped beam light at the edge of the aperture is somewhat attenuated.
On the other hand, one is usually interested in as high a low beam intensity as possible at the edge of the aperture to achieve a wide range of low beam.
Disclosure of Invention
Against this background, it is an object of the present invention to provide a motor vehicle headlight with the advantages of a radar sensor system integrated into the motor vehicle headlight without having to endure the disadvantages in producing a low-beam light distribution or a high-beam light distribution for this purpose, and in which the radar sensor system has a large radar-functional surface.
The invention achieves this object in that at least one visible light beam is a beam of a signal light function.
In this case, the signal light distribution has the advantage that a possible unavoidable reduction of the visible light intensity has hardly any effect on the signal effect.
A preferred embodiment is characterized in that the signal light function is a flashing light function or a daytime running light function or a position light function. In the case of the flash function, it is advantageous if the flash function is always activated only for a relatively short time compared to the permanent illumination function, so that a possible reduction of the signal effect is relatively rare. In the case of the daytime running light function, the intensity reduction and thus the reduction of the signal effect that can occur with the operation of the radar module is not as important as in the case of a main light function such as a low beam and/or a high beam that is switched on in the dark, for a long time due to a bright environment. It is therefore desirable that the primary light function is not impaired by the radar sensor system.
It is also preferred that the radar function has a basic structure made of a visible light-transparent plastic coated with a visible light-transparent dielectric layer.
It is also preferred that the layer thickness of the dielectric layer varies and here is an integer multiple of the half wavelength of the radar radiation over half the surface of the radar functional element.
By varying the layer thickness it is possible to control in which directions constructive interference occurs and in which other directions destructive interference occurs. Thus, it is possible to specify which directions are preferred for the reflection of radar radiation incident from the outside independently of other forms and arrangements of radar functional elements.
A further preferred embodiment is characterized in that the radar module has a radar radiation emitter which is arranged between the cover plate and the radar functional layer in the motor vehicle headlight in such a way that the radar radiation emitted by the radar emitter is directed toward the cover plate. In the transmitter path, no deflection is therefore carried out at the radar function, so that this can be optimally designed for the reception path.
It is also preferred that the radar radiation detector is arranged between the cover plate and the radar functional layer in such a way that its radiation-sensitive detector surface faces the radar functional layer.
By this orientation, the radiation-sensitive surface can be illuminated without losses using radar radiation incident from the radar function, which results in a desired, sharp radar signal in the subsequent signal processing.
It is also preferred that the radar functional layer extends around the main emission direction of a central headlight beam of a motor vehicle headlight. By means of this profile, a desired large surface of the radar functional layer can be achieved without the central headlight beam being impaired in this case.
A further preferred embodiment provides that the central headlight beam is a dipped headlight beam.
It is also preferred that the central headlamp beam is a high beam.
It is also preferred that the surface of the radar functional layer is shaped and arranged such that it does not intersect either the low beam or the high beam.
Further advantages result from the following description, the drawings and the dependent claims. It goes without saying that the features mentioned above and to be explained below can be used not only in the respectively specified combination but also in other combinations or alone without departing from the scope of the invention.
Drawings
Embodiments of the invention are illustrated in the drawings and are described in more detail in the following description.
The figures are respectively shown in schematic form:
fig. 1 shows an embodiment of a motor vehicle headlamp according to the invention in a side view; and
fig. 2 shows the motor vehicle headlight of fig. 1 in a front view.
Detailed Description
In particular, fig. 1 shows a motor vehicle headlamp 10 having a housing 12, the light exit opening of which housing 12 is covered by a cover 14 which is transparent to visible light and radar radiation. The x direction represents the main emission direction of the motor vehicle headlight 10 not only for radar radiation but also for visible light. The y-direction is parallel to the transverse axis of the motor vehicle when the motor vehicle headlight 10 is in intended use, and the z-direction is correspondingly parallel to the longitudinal axis of the motor vehicle at this time.
Various means 16 for emitting at least one beam of visible light are arranged in the housing 12.
The device 16 comprises in the example shown at least one signal lamp module 18 and a headlight module 20. At least one signal light module generates one or more signal light beams, with which a signal light distribution and thus a signal light function is generated in each case.
The at least one visible light beam which is intersected by the radar function layer according to the invention is such a beam 22 of the signal function. The relevant signal light function is, for example, a flashing light function or a daytime running light function or a position light function. In the illustrated example, the signal light function is a flashlight function.
Another visible light beam 24 is generated in the embodiment of fig. 1 by a low beam module 26. The low beam light module 26 has a light source 28, which light source 28 is typically a semiconductor light source. The visible light of the further light beam 24 emitted from the light source 28 is focused by the primary optics 30, here the half-shell reflector, into a focal region 32 of the primary optics 30, which focal region 32 is at the same time the focal region of the projection optics 34, here the projection lens. The internal light distribution that occurs in the focal region 32 is limited by an aperture 36 that is opaque to visible light. The internal light distribution thus limited is emitted by the projection optics 34 through the cover 14 as an external low beam distribution, thereby for example illuminating a road section. As an alternative or in addition to the low beam module, a high beam module can also be arranged in the housing. As so far described, one example of a high beam module differs from a low beam module in that the diaphragm 36 is omitted.
Furthermore, a radar radiation module 38 is arranged in the housing. The radar radiation module 38 has a radar radiation emitter 40. The radar radiation module 38 also has a radar radiation detector 42 and at least one radar function 44.
Radar-radiation emitter 40 is configured to emit radar radiation 46. The radar radiation preferably has a wavelength of about 4mm and a corresponding frequency of 77 GHz. The radar radiation emitter 40 is arranged in the housing 12 of the motor vehicle headlight 10 between the cover plate 14 and the radar functional layer 50 of the radar functional element 44 in such a way that the radar radiation 46 emitted by it is directed toward the cover plate 14.
The radar function 44 has a basic structure 48 made of a visible light-transparent plastic which is coated with a visible light-transparent dielectric radar function layer 50.
The layer thickness d of the dielectric radar functional layer 50 varies over its surface. The layer thickness d is here an integer multiple of the half-wavelength of the radar radiation 46 over half the surface of the radar function 44. By varying the layer thickness d, it is possible to control in which directions constructive interference occurs and in which other directions destructive interference occurs the radar radiation 46' reflected at the boundary surfaces 52, 54 of the dielectric radar functional layer 50. Here, the boundary surface 54 is located between the remaining part of the radar function layer 50 and the basic structure 48, and the boundary surface 52 faces the cover plate 14. Reflected radar radiation 46' is radar radiation reflected at an object (object = O in fig. 2) that has been emitted by radar radiation emitter 40 as radar radiation 46.
Thus, it is possible to influence which directions are preferred for the reflection of the externally incident radar radiation 46' independently of other forms and arrangements of the radar functional elements. Due to this interference and/or due to its shape and/or its arrangement in the housing 12 relative to the cover plate 14 and the radar radiation detector 42, the radar functional element 44 is provided to deflect the radar radiation 46' incident on the radar functional layer 44 onto the radar radiation detector 42 in a beam-focused manner.
The radar functional layer 50 (and the base structure 48) has a lower transparency for radar radiation 46' than for visible light and is shaped and arranged such that it intersects the visible light beam 22 of the signaling function of the motor vehicle headlight 10. The radar functional layer 50 is almost transparent to visible light and therefore has little to no effect on the light function.
The radar radiation detector 42 has a radiation sensitive detector surface 56. The radar radiation detector 42 is arranged between the cover plate 14 and the radar functional layer 50 in such a way that its radiation-sensitive detector surface 56 faces the radar functional layer 50.
Fig. 2 shows a front view of the motor vehicle headlight 10 of fig. 1. The viewing direction corresponds to the negative x-direction. The radar radiation 46 emitted from the radar radiation emitter 40, preferably in the x direction, is reflected when it strikes an object O present in the field of view of the radar radiation module 38 (see fig. 1) and strikes the radar functional layer 50 of the radar functional element 44 as reflected radar radiation (46'). The radar function 44 deflects the incident, reflected radar radiation 46' onto the radiation sensitive detector surface 56.
Fig. 2 shows, in particular, that the radar functional layer 50 is curved in the exemplary embodiment under consideration about the main emission direction x of the central headlight light beam (see also fig. 1) of the motor vehicle headlight 10. The central headlight beam is here the beam which passes through the projection lens of the projection optics 34, for example the further beam 24 in fig. 1. By detecting the reflected radar radiation 46', the reflected radar radiation 46 is detected using a surface many times larger than the radiation sensitive detector surface 56.
In the embodiment shown in the figures, the central headlight beam is a dipped headlight beam. Alternatively, the central headlamp beam may be a high beam light beam. When the diaphragm is omitted, a high beam light beam appears in the case of the object in fig. 2. The radar functional layer is preferably shaped and arranged such that it does not intersect either the low beam or the high beam.
In contrast, the radar functional layer 50 intersects the light beams 62 and 22 emitted from the daytime running light module 60 and from the signal light module 18, preferably in the x direction, which is indicated in fig. 2 by the overlap 64, 66 between the cross section of the signal light beams 22, 62, which is here illustrated as a circle, and the radar functional element 44.
The restricted installation space can thus be utilized optimally when integrating the radar module into a motor vehicle headlight, and the field of view of the radar radiation module can be increased by the increase in the receiving aperture of the radar radiation module which accompanies the use of a large-surface radar functional layer, without the low beam distribution and/or the high beam distribution of the motor vehicle headlight being adversely affected.
In principle, it is also possible to swap the functional surfaces and thus integrate the radar function behind the illumination function, wherein the embodiment described with reference to the drawing is preferred because here the aperture of the radar module in the receive channel and thus the sensitivity of the radar module is increased.

Claims (10)

1. Motor vehicle headlight (10) having a device (16) for emitting at least one visible light beam (22, 62) and having a radar emission module (38), the radar emission module (38) being provided to emit radar radiation (46), the radar emission module (38) having a radar radiation detector (42) and at least one radar functional element (44), the radar functional element (44) having a radar functional layer (50), wherein the radar radiation detector (42) has a radiation-sensitive detector surface (56), the radar functional element (44) being provided to deflect radar radiation (46 ') incident on the radar functional layer (50) onto the radar radiation detector (42) in a beam-focused manner, and the radar functional layer (50) having a lower transparency for the radar radiation (46') than for visible light and being shaped and arranged such that it intersects the visible light beam (22, 62), characterized in that the at least one visible light beam (22, 60) is a signal-light-function beam.
2. Motor vehicle headlamp (10) according to claim 1, characterized in that the signal light function is a flashing light function or a daytime running light function or a position light function.
3. Motor vehicle headlight (10) according to one of the preceding claims, characterized in that the radar function element (44) has a basic structure (48) made of a visible light-transparent plastic which is coated with a visible light-transparent dielectric layer as a radar function layer (50).
4. Motor vehicle headlight (10) according to claim 3, characterized in that a layer thickness (d) of the radar functional layer (50) varies and in that case is an integer multiple of a half wavelength of the radar radiation (46) in more than half of a surface of the radar functional layer (50) of the radar functional element (44).
5. Motor vehicle headlight (10) according to one of the preceding claims, wherein the radar radiation module (38) has a radar radiation emitter (40), the radar radiation emitter (40) being arranged in the motor vehicle headlight (10) between a cover plate (14) and the radar functional layer (50) in such a way that radar radiation (46) emitted by it is directed towards the cover plate (14).
6. Motor vehicle headlight (10) according to one of the preceding claims, characterized in that the radar radiation detector (42) is arranged between the cover plate (14) and the radar functional layer (50) such that its radiation-sensitive detector surface (56) faces the radar functional layer (50).
7. Motor vehicle headlamp (10) according to any of the preceding claims, characterized in that the radar functional layer (50) is curved around a main emission direction (x) of a central headlamp beam (24) of the motor vehicle headlamp (10).
8. Motor vehicle headlight (10) according to claim 7, characterized in that the central headlight beam (24) is a dipped headlight beam.
9. Motor vehicle headlight (10) according to claim 7, characterized in that the central headlight beam (24) is a high beam.
10. Motor vehicle headlight (10) according to one of the preceding claims, characterized in that the radar functional layer (50) is shaped and arranged such that it does not intersect either the low beam or the high beam light beams.
CN202210682945.0A 2021-06-21 2022-06-16 Motor vehicle headlamp with a radar radiation module Pending CN115571043A (en)

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Publication number Priority date Publication date Assignee Title
JP4919179B2 (en) 2010-05-11 2012-04-18 独立行政法人電子航法研究所 Millimeter wave radar built-in headlamp
DE102016101756A1 (en) 2016-02-01 2017-08-03 Vega Grieshaber Kg Method for determining and displaying the optimum material thickness in level measurement with radar sensors
DE112017004249T5 (en) 2016-09-26 2019-05-16 Panasonic Intellectual Property Management Co., Ltd. Resin composition for millimeter-wave reflection; Resin film using the same fiber and article for millimeter wave reflection

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