Exterior trim element for a lidar

Abstract

Exterior trim element for a lidar The present invention relates to a window part of an exterior trim element for a vehicle The window part is intended to be placed in front of a lidar. The window part comprises a carrier intended to be attached to the exterior trim element. The window part further comprises a pane encapsulated in the carrier by encapsulation means. The carrier is at least partially elongated in a direction towards the lidar, forming an elongated part. Such elongated part comprises diffusive means. The present invention further relates to an exterior trim element comprising such a window part, a vehicle comprising such an exterior trim element and a lidar positioned behind said exterior trim element, and the use of such a window part in front of a lidar.

Description

Exterior trim element for a lidarFIELD OF THE INVENTION

[0001] The present invention relates to the field of lidar technology, specifically to an exterior trim element covering a lidar. More particularly, the invention pertains to a trim element designed to reduce unwanted reflections that may occur during lidar operation.BACKGROUND OF THE INVENTION

[0002] In recent years, lidar technology has become increasingly important for enabling advanced perception capabilities in various industries. Lidar systems utilize laser beams to measure distances and create detailed 3D maps of the surrounding environment. These systems are commonly used in vehicles to provide accurate object detection and localization.

[0003] WO2018015312 describes the positioning of such lidar behind a vision glazing, such as a windshield of a vehicle. A vehicle includes cars, vans, lorries, motorbikes, buses, trams, trains, airplanes, helicopters, drones, boats and the like.

[0004] Another possible integration is to position the lidar behind an exterior trim element, as described in W02018015313. An exterior trim element includes bumper, window / door seal, pillar, wheel well, wheel arch, fender, headlight, mirror body and roof cover. Such exterior trim element can also be deployable, meaning it can pop out from the vehicle when needed. Vehicle manufacturers use these exterior trim elements to add aesthetics, increase function, and add flexibility to the vehicle design.

[0005] The trim element incorporates a window allowing the emitted laser light, as well as the detected laser light, to pass through.

[0006] When a lidar is placed behind a trim element, it means the lidar housing, including the lidar itself, is placed behind the trim element. The window of the trim element is obviously placed such that it coincides with the window of the lidar housing. The trim element therefore covers the lidar housing and serves as a protective barrier against environmental factors such as dust, moisture, and temperature variations.

[0007] One of the primary disadvantages of the existing lidar trim elements is theoccurrence of unwanted reflections. When emitted laser light passes through the window of the trim element, a portion of the light is reflected back due to the refractive index mismatch between the window and the surrounding medium. These reflections can cause interference patterns and distort the received signals, leading to inaccurate distance measurements and reduced lidar performance.

[0008] Furthermore, when light enters an optical system, it can undergo multiple internal reflections between the surfaces of the optical elements. Each reflection causes a small portion of the light to be transmitted or reflected, leading to the formation of ghost images. These ghost images are typically fainter and displaced from the primary image, and they can be particularly problematic in high-precision optical systems where image quality is critical.

[0009] Furthermore, internal reflections also occur. These reflections arise from the window of the housing and from the window of the trim element. Internal reflections can be particularly problematic as they can introduce additional noise and reduce the signal-to-noise ratio, further degrading the lidar system's performance.

[0010] To address these issues, it is known to place a baffle where such unwanted reflections occur. WO2013123161 and US2018217474, for example, disclose such baffle placed between the windshield of a vehicle and the camera. The baffle is designed to redirect, scatter or absorb the reflected light, reducing the intensity of the reflections. The baffle is positioned on the bracket, meaning on the element supporting the camera itself. The bracket is usually glued to the windshield.

[0011] However, in the case of a trim element, such implementation would be complex to manufacture. Structural modifications can be complex and may require additional manufacturing steps, increasing the overall cost and complexity of the trim element.SUMMARY OF THE INVENTION

[0012] The present invention concerns a window part of an exterior trim element for a vehicle. The window part is intended to be placed in front of a lidar. The window part comprises a carrier intended to be attached to the exterior trim element. The window part further comprises a pane encapsulated in the carrier by encapsulation means. The carrier is at least partially elongated in a direction towards the lidar, forming an elongated part. Such elongated part comprises diffusive means.

[0013] The present invention further concerns an exterior trim element comprising such a window part.

[0014] The present invention further concerns a vehicle comprising such an exterior trim element and a lidar positioned behind said exterior trim element.

[0015] The present invention further concerns the use of such a window part in front of a lidar.BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Fig.1a-c show illustrative exterior trim elements on a vehicle, behind which a lidar is placed.

[0017] Fig.2 illustrates a window part according to prior art.

[0018] Fig.3-5 illustrate exemplary embodiments according to the present invention.DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

[0019] The invention will now be described further, byway of examples, with reference to the accompanying drawings, wherein like reference numerals refer to like elements in the various figures. These examples are provided by way of illustration and not of limitation. The drawings are a schematic representation and not true to scale. The drawings do not restrict the invention in any way. More advantages will be explained with examples.

[0020] In this document to a specific embodiment and include various changes, equivalents, and / or replacements of a corresponding embodiment. The same reference numbers are used throughout the drawings to refer to the same or like parts.

[0021] As used herein, spatial or directional terms, such as "inner", "outer", "above", "below", "top", "bottom", and the like, relate to the invention as it is shown in the drawing figures. However, it is to be understood that the invention can assume various alternative orientations and, accordingly, such terms are not to be considered as limiting. Further, all numbers expressing dimensions, physical characteristics, processing parameters, quantities of ingredients, reaction conditions, and the like, used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical values set forth in the following specification and claims are approximationsthat can vary depending upon the desired properties sought to be obtained by the present invention. In the following description, unless otherwise specified, expression “substantially” mean to within 10%, preferably to within 5%.

[0022] Moreover, all ranges disclosed herein are to be understood to be inclusive of the beginning and ending range values and to encompass any and all subranges subsumed therein. For example, a stated range of “1 to 10” should be considered to include any and all subranges between (and inclusive of) the minimum value of 1 and the maximum value of 10; that is, all subranges beginning with a minimum value of 1 or more, e.g. 1 to 6.1 , and ending with a maximum value of 10 or less, e.g., 5.5 to 10. Further, as used herein, the terms “deposited over” or “provided over” mean deposited or provided on but not necessarily in surface contact with. For example, a coating “deposited over” a substrate does not preclude the presence of one or more other coating films of the same or different composition located between the deposited coating and the substrate.

[0023] Where the term “comprising” is used in the present description and claims, it does not exclude other elements or steps. Where an indefinite or definite article is used when referring to a singular noun e.g. “a” or “an”, “the”, this includes a plural of that noun unless something else is specifically stated. In this document, “configured to (or set to)” may be interchangeably used in hardware and software with, for example, “appropriate to”, “having a capability to”, “changed to”, “made to”, “capable of”, or “designed to” according to a situation. In any situation, an expression “device configured to do” may mean that the device “can do” together with another device or component.

[0024] Furthermore, the terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequence, either temporally, spatially, in ranking or in any other manner. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. When it is described that a constituent element (e.g., a first constituent element) is “(functionally or communicatively) coupled to” or is “connected to” another constituent element (e.g., a second constituent element), it should be understood that theconstituent element may be directly connected to the another constituent element or may be connected to the another constituent element through another constituent element (e.g., a third constituent element).

[0025] The present invention will be described with respect to particular embodiments and with reference to certain drawings but the invention is not limited thereto but only by the claims.

[0026] While some embodiments described herein include some but not other features included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention, and form different embodiments, as would be understood by those in the art. For example, in the following claims, any of the claimed embodiments can be used in any combination.<Exterior trim element>

[0027] The present invention proposes a window part of an exterior trim element. An exterior trim element includes bumper, window / door seal, pillar (such as A-pillar, B- pillar, C-pillar or D-pillar commonly used in cars), wheel well, wheel arch, fender, headlight, mirror body, rooftop (comprised between the roof and the windshield or rearlite) and roof cover. Such exterior trim element can also be deployable, meaning it can pop out from the vehicle when needed.<Lidar>

[0028] The window part is intended to be placed in front of a lidar. The window part is an additional cover protecting the lidar placed behind the exterior trim element.

[0029] Lidar is an acronym for “light detection and ranging”. It is sometimes called “laser scanning” or “3D scanning”. The technology uses laser beams to create a 3D- representation of the surveyed environment. Operating wavelength of lidar compatible with the present invention is comprised between 780nm and 1650nm (usually referred to as near-infrared). More specifically, known operating wavelengths of currently produced lidars compatible with the present invention are 850nm, 905nm, 940nm, 1064nm, 1310nm, 1350nm, 1550nm. An acceptable variance of 25nm around the nominal value of the operating wavelength may be considered, such that, for example, a wavelength range of 1525nm to 1575nm may be accepted around the nominal value of 1550nm.<Window part>

[0030] A window part of an exterior trim element is understood as a part of an exterior trim element which serves as a window.

[0031] The window part is transparent at the operating wavelength of the lidar intended to be placed behind.

[0032] In some embodiments, the window part is opaque in the visible wavelength range, such that the window part is transparent at the operating wavelength of the lidar intended to be placed behind but it does not allow visible light to pass through. This blackening can be performed by various ways known by the person skilled in the art, such as a print, a film or a specific coating. Such implementation has at least two advantages. First, the lidar is not seeable through the window part, which is often a request from vehicle manufacturers. Second, there is no incoming visible light passing through the window part, potentially perturbing the receptor of the lidar, which may have a certain sensitivity in the visible wavelength range, leading to a lower signal to noise ratio.<Carrier>

[0033] The window part comprises a carrier. The carrier is intended to be attached to the exterior trim element. The carrier can be attached to the exterior trim element by various means known by the person skilled in the art, such as repositionable means (screws, inserts, ... ) or non-repositionable means (glue, ... ).

[0034] In some embodiments, the carrier is made of polycarbonate (PC), or a combination of polycarbonate and polyethylene terephthalate (PC / PET), or polybutylene terephthalate (PBT) with glass fiber or glass ball, or polypropylene (PP) with glass fiber or glass ball. Polycarbonate and its combinations with other materials provide high impact resistance, making them suitable for applications where durability is crucial, such as in automotive components. Polycarbonate, PET, and PBT with glass fiber or glass ball reinforcement offer good heat resistance, allowing them to withstand high temperatures without deforming or losing their mechanical properties. This makes them suitable for use in automotive components. The addition of glass fiber or glass ball reinforcement to PET, PBT, or polypropylene improves their dimensional stability, reducing warping and ensuring tight tolerances in molded parts. Polycarbonate and its combinations with other materials are lightweight, making them suitable forapplications where weight reduction is important, such as in automotive components. These materials can be easily molded into complex shapes, allowing for intricate designs and reducing the need for additional components in the final product.<Pane>

[0035] The window part further comprises a pane.

[0036] The pane can be made of glass or polycarbonate.

[0037] In some embodiments, the pane is made of at least one sheet of mineral glass, more specifically a silica-based glass, such as soda-lime-silica, alumino-silicate or boro-silicate type glass. The glass sheet may be obtained by a floating process, a drawing process, a rolling process or any other process known to manufacture glass sheet starting from a molten glass composition.

[0038] In some embodiments, the glass sheet ranges from 0.7mm to 4mm in thickness.

[0039] The pane can also be a laminate, meaning it comprises at least two sheets of glass laminated together with an interlayer to form a laminate. Laminated glass offers several advantages due to its unique construction, which consists of two or more glass sheets bonded together with an interlayer, typically made of polyurethane (PU), polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA) or cyclopolyolefin (COP). One of the primary advantages of laminated glass is its ability to hold together when shattered, due to the interlayer holding the glass fragments in place. This reduces the risk of injury from sharp glass shards. It further allows also to protect the lidar placed behind the laminated glass even in case of breakage. Laminated glass allows for a wide range of design possibilities, including incorporating decorative interlayers, colored interlayers, or custom printed interlayers.

[0040] In some embodiments, the pane comprises at least one glass sheet having an absorption coefficient less than 15m’1at the operating wavelength range of the lidar. The at least one glass sheet comprises an internal face facing the lidar and an external face opposite to the internal face.

[0041] To quantify the low absorption of the glass sheet in the near-infrared range, in the present description, the absorption coefficient is used in the wavelength range from 780nm to 1650nm. The absorption coefficient is defined by the ratio between theabsorbance and the optical path length traversed by electromagnetic radiation in a given environment. It is expressed in rrr1. It is therefore independent of the thickness of the material but it is function of the wavelength of the absorbed radiation and the chemical nature of the material.

[0042] In the case of glass, the absorption coefficient (p) at a chosen wavelength X can be calculated from a measurement in transmission (T) as well as the refractive index n of the material (thick = thickness), the values of n, p and T being a function of the chosen wavelength 7:with p = (n-1 )2 / (n+1 )2.

[0043] The glass sheet having an absorption coefficient at the operating wavelength of the lidar of less than 15m’1, preferably less than 10m’1, even more preferably less than 5m’1, may be a soda-lime-silica glass, alumino-silicate, boro-silicate, ...

[0044] Preferably, a glass composition compatible with the present invention comprises a total content expressed in weight percentages of glass:SiO255 - 85%AI2O3 0 - 30%B2O3 0 - 20%Na2O 0 - 25%CaO 0 - 20%MgO 0 - 15%K2O 0 - 20%BaO 0 - 20%.

[0045] More preferably, a glass composition compatible with the present invention comprises in a content expressed as total weight of glass percentages:SiO255 - 78%AI2O3 0 - 18%B2O30 - 18%Na2O 0 - 20%CaO 0 - 15%MgO 0 - 10%K2O 0 - 10%BaO 0 - 5%

[0046] More preferably, for reasons of lower production costs, the glass compatible with the present invention is made of soda-lime glass. A glass composition compatible with the present invention comprises a content expressed as the total weight of glass percentages:SiO260 - 75%AI2O30 - 6%B2O30 - 4%CaO 0 - 15%MgO 0 - 10%Na2O 5 - 20%K2O 0 - 10%BaO 0 - 5%.

[0047] In addition to its basic composition, the glass may include other components, nature and adapted according to quantity of the desired effect. A solution to obtain a very transparent glass in the near-infrared, with weak or no impact on its aesthetic or its color, is to combine in the glass composition a low iron quantity and optionally chromium in a range of specific contents. Thus, the glass preferably has a composition which comprises a content expressed as the total weight of glass percentages:Fe total (expressed asFe2O3) 0,002 - 0,06%Cr2O30 - 0,06 %.

[0048] Such glass compositions combining low levels of iron and chromium showed particularly good performance in terms of near-infrared reflection and show a hightransparency in the visible and a little marked tint, near a glass called "extra-clear These compositions are described in international applications W02014128016A1 , WO2014180679A1 , W02015011040A1 , WO2015011041 A1 , W02015011042A1 , WO201 5011043A1 and WO2015011044A1 .<Encapsulation>

[0049] The pane is encapsulated in the carrier by encapsulation means. “Encapsulated” means the pane is framed by injecting a polymer on its border through a framing mold. In other words, rubber or molten plastic is injected around the outside of the pane so that it melds the carrier to the pane’s edges. The rim is formed with the material as it cools down and encapsulates the pane. This creates an unbreakable border around the pane. Furthermore, it ensures the sealing of the window part, avoiding water or dust to penetrate.

[0050] Material used for encapsulation are thermoplastic elastomers (TPE), polyurethane (PU), polyvinylchloride (PVC).

[0051] In some embodiments, the encapsulation extends to cover the elongated part of the carrier. The encapsulation means are matt, and therefore can play the role of the diffusive means. Such configuration eases the process of manufacturing, as the diffusive means, being the same as the encapsulation means, do not need an additional step to be made.<Diffusive means>

[0052] The carrier is at least partially elongated in a direction towards the lidar. It means that when the lidar is placed behind the window part of the exterior trim element, the carrier at least partially fills the gap between the window part of the exterior trim element and the lidar.

[0053] The elongated part comprises diffusive means. This has the particular advantage that scattered light that enters from outside through the pane is less, or even not, reflected into the lidar detector and, consequently, causes less, or even no, interference signals. It further has the advantage that light emitted by the lidar, then striking the pane and being reflected towards the elongated part is diffused, therefore not striking the detector of the lidar, or at least in a lesser extent. It therefore decreases, or even suppresses, the internal reflections occurring between the lidar and the paneof the window part of the exterior trim element.

[0054] In this configuration, the diffusive means are therefore attached not to the housing of the lidar, but to the window part of the exterior trim element. It allows to ease the mounting and assembling, as it is part of the exterior trim element. The carrier, used to attach the pane to the exterior trim element, renders easier to adapt the design of this part, instead of adding a new element to the housing of the lidar, as adding a new part to the lidar would require additional assembly step to attach the carrier to the lidar housing.

[0055] In some embodiments, the carrier is made of same material as material commonly used for bracket for Advanced Driver Assistance Systems (ADAS) camera of windshield. These materials are high-performance engineering plastics such as polyamide (nylon), polycarbonate (PC), and polybutylene terephthalate (PBT). These materials offer a good balance of strength, impact resistance, and dimensional stability while being lighter than metal alternatives. They also provide design flexibility and can be molded into complex shapes. Using the same material allows to take advantage of the experience already acquired with such material. It therefore allows to easily integrate same texture or coating to avoid or limit the direct reflection to the lidar as it is already done for camera bracket.

[0056] In some embodiments, the elongated part is patterned or structured on the surface facing the pane, such as diffraction grating. The patterning is, for example, fluting or a zigzag or wave-shaped form. Such patterning allows to reduce, or even avoid, scattered light to be reflected into the lidar detector.

[0057] In some embodiments, the elongated part comprises a diffusive element, such as a diffusive coating (including a light-absorbing or light-scattering paint such as NEXTEL® matt coating) or a diffusive film, positioned on the elongated part. Such diffusive coating or film allows to reduce, or even avoid, scattered light to be reflected into the lidar detector.

[0058] In some embodiments, the carrier is elongated throughout the whole periphery of the pane. Such configuration allows to decrease, or even to avoid, internal reflections occurring on all the surfaces of the volume between the pane and the lidar.

[0059] In some embodiments, the elongated part has a length comprised between 5.0mm and 30mm. It allows the elongated part to reach the housing of the lidar, oncethe lidar is installed behind the window part of the exterior trim element. Such range allows to encounter various configurations, depending on the distance between the carrier and the lidar. In preferred embodiments, the elongated part covers the full distance between the carrier and the housing of the lidar, therefore decreasing, r even avoiding, internal reflections that could otherwise have occurred where no diffusive means had been present.

[0060] Fig.1a-c show illustrative exterior trim elements (2) on a vehicle (3), behind which a lidar (4) is placed. Fig.la illustrates a bumper (2), Fig.lb a fender (2) and Fig.lc a rooftop (2).

[0061] Fig.2 illustrates how a pane (100) is integrated into an exterior trim element (2) in the prior art. The pane (100) is positioned in front of a lidar (4), such that the field of view (FOV) (40) of the lidar (4) is comprised within the pane (100).

[0062] The pane (100) is encapsulated through encapsulation means (13) in a carrier (10).

[0063] In this example, the carrier (10) has been first injected. Then, the carrier (10) and the pane (100) are placed in a mold. The mold is then closed, and the encapsulation material, in this example thermoplastic elastomer (TPE) is injected. The encapsulation material fill in a cavity between the carrier (10) and the pane (100). The mold is then opened, allowing to get the pane (100) encapsulated through encapsulation means (13) in the carrier (10).

[0064] The carrier (10) is positioned on the exterior trim element (2), using glue or any fixation means known by the person skilled in the art. There is usually some space between the encapsulation means (13) and the exterior trim element (2) in order to keep some free space to facilitate the installation.

[0065] In conventional configuration, the lidar (4) is usually attached to a bracket (not shown). Some diffusive elements can then be attached to the bracket itself, in order to avoid, or at least minimize, internal reflections.

[0066] Fig.3 illustrates an exemplary embodiment according to the present invention. In this exemplary embodiment, the carrier (10) is partly elongated towards the lidar (4), forming an elongated part (11 ). The elongated part (11 ), in this exemplary embodiment, is present on the low section of the carrier (10). The elongated part (11 )does not interfere with the FOV (40) of the lidar (4) when the window part (1 ) of the exterior trim element (2) is placed in front of the lidar (4).

[0067] The elongated part (11 ) presents diffusive means (12) on its face facing the pane (100). As mentioned previously, the diffusive means (12) can be a pattern or a structuration of the surface of the elongated part (11 ), acting as a diffraction grating, or a diffusive coating (including a light-absorbing or light-scattering paint) or a diffusive film, positioned on the elongated part (11 ).

[0068] The diffusive means (12) are attached not to the housing of the lidar (4), but to the window part (1 ) of the exterior trim element (2). It allows to ease the mounting and assembling, as it is part of the exterior trim element (2). The carrier (10), used to attach the pane (100) to the exterior trim element (2), renders easier to adapt the design of this part, instead of adding a new element to the housing of the lidar (4), as adding a new part to the lidar (4) would require additional assembly step to attach the carrier (10) to the lidar (4) housing.

[0069] Fig.4 illustrates another exemplary embodiment according to the present invention. In this exemplary embodiment, the carrier (10) is elongated both on the high section and on the low section of the carrier (10). Such configuration further decreases the occurrence of internal reflections.

[0070] In some embodiments, the carrier (10) could be elongated around its full perimeter, thereby further decreasing the occurrence of internal reflections.

[0071] In some embodiments, the elongated part (11 ) could reach close to the lidar (4) when the window part (1 ) is installed in front of the lidar (4). This allows to maximize the presence of the diffusive means (12) around the FOV (40), and therefore to decrease further the occurrence of internal reflections.

[0072] In some embodiments, the elongated part (11 ) has a length comprised between 5.0mm and 30mm, corresponding to the distance range between the carrier (10) and the lidar (4).

[0073] Fig.5 illustrates another exemplary embodiment according to the present invention. In this exemplary embodiment, the encapsulation means (13) are also elongated to cover the elongated part (11 ) of the carrier (10). The encapsulation means (13) play the role of the diffusive means (12). The encapsulation means (13),such as thermoplastic elastomers (TPE), polyurethane (PU), polyvinylchloride (PVC) are indeed matt. Such configuration has the advantage that both the encapsulations means (13) and the diffusive means (12), being the same, are made in a single process.

[0074] In this exemplary embodiment, the elongated part (11 ) of the carrier (10) is also present both on the high section and on the low section of the carrier (10). However, the encapsulation means (13) could be elongated to cover only the lower part of the elongated part (11 ) of the carrier (10).

[0075] While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive. The foregoing description details certain embodiments of the invention. It will be appreciated, however, that no matter how detailed the foregoing appears in text, the invention may be practiced in many ways. The invention is not limited to the disclosed embodiments.

Claims

Claims1 . Window part (1 ) of an exterior trim element (2) for a vehicle (3), the window part (1 ) being intended to be placed in front of a lidar (4), the window part (1 ) comprising: a. A carrier (10) intended to be attached to the exterior trim element (2); b. A pane (100) encapsulated in the carrier (10) by encapsulation means (13);Characterized in that the carrier (10) is at least partially elongated in a direction towards the lidar (4), forming an elongated part (11 ), the elongated part (11 ) comprising diffusive means (12).

2. Window part (1 ) according to claim 1 , wherein the diffusive means (12) are a structuration of the elongated part (11 ).

3. Window part (1 ) according to claim 1 , wherein the diffusive means (12) are a diffusive element positioned on the elongated part (11 ).

4. Window part (1 ) according to any one of the previous claims, wherein the carrier (10) is elongated throughout the whole periphery of the pane (100).

5. Window part (1 ) according to any one of the previous claims, wherein the elongated part (11 ) has a length comprised between 5.0mm and 30mm.

6. Window part (1 ) according to any one of the previous claims, wherein the elongated part (11 ) is present along the complete periphery of the carrier (10).

7. Window part (1 ) according to any one of the previous claims, wherein the encapsulation means (13) are further positioned on the elongated part (11 ) of the carrier (10) to act as diffusive means (12).

8. Window part (1 ) according to any one of the previous claims, wherein the pane (100) is made of at least one glass sheet.

9. Exterior trim element (2) comprising a window part (1 ) according to any one of the previous claims.

10. Vehicle (3) comprising at least one exterior trim element (2) according to claim 9 and at least one lidar (4) positioned behind said at least one exterior trim element (2).11 . Use of a window part (1 ) according to any one of claims 1 to 8 in front of a lidar (4).

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