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US 12,663,515 B2Granted
Thermoplastic composition for LiDAR sensor system with improved absorption properties
AssigneeCovestro Deutschland AG
InventorsAlexander Meyer, Peter Capellen, Rafael Oser, Rainer Hagen, Christoph Klinkenberg
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Abstract
A sensor system comprises a LiDAR unit having an emitter for laser light having a wavelength of 900 nm to 1600 nm and a receiver for light over a wavelength range which is between 800 nm and 1600 nm and at least partly below the operating wavelength of the LiDAR sensor and a cover having a substrate layer made of thermoplastic material which is arranged such that IR light emitted by the LiDAR unit and received by the LiDAR unit passes through the cover.
Claims13
A sensor system comprising
- a LiDAR unit having an emitter for laser IR light having an operating wavelength of 900 nm to 1600 nm and a receiver for laser light over a wavelength range which is between 800 nm and 1600 nm and is at least partially below the operating wavelength of the LiDAR sensor and
- a cover having a substrate layer comprising a region made of a thermoplastic composition
- based on aromatic polycarbonate and/or polymethyl methacrylate which is arranged such that the IR light emitted by the LiDAR emitter and received by the LiDAR receiver passes through the region made of the thermoplastic composition,
- wherein the thermoplastic composition has a light transmission Ty (D65, 10°) determined according to DIN EN ISO 13468-2:2006 at a layer thickness of 4 mm of <0.5%,
- wherein the thermoplastic composition contains
- a) at least two colorants having an absorption maximum in the range from 400 nm to 650 nm selected from the group consisting of anthraquinone and perinone dyes in a total concentration of 0.07% by weight to 0.5% by weight, and
- b) at least one colorant having an absorption maximum in the range from >650 nm to 800 nm selected from the group consisting of the colorants of formulae (1) to (5) with
- in a concentration of 0.008% to 0.02% by weight,
- wherein
- R1 and R2 independently of one another represent a linear or branched alkyl radical or halogen,
- n is a natural number between 0 and 4,
- in a concentration of 0.002% to 0.008% by weight,
- where
- and
- n is from 1 to 3,
- in a concentration of 0.002% to 0.008% by weight, wherein the total concentration of colorants of formulae (2) and (3) is up to 0.008% by weight,
- in a concentration of 0.04% to 0.3% by weight where R=n-butyl, iso-butyl,
- in a concentration of 0.04% to 0.3% by weight,
- in a total concentration of 0.005% to 0.3% by weight
- wherein the composition contains <0.05% by weight of phthalocyanines,
- wherein the cover comprises no further layers other than the substrate layer, one or more primer layers optionally present and one or more topcoat layers optionally present,
- wherein the primer layer is based on polymethylmethacrylate and optionally contains a UV absorber and the topcoat layer is based on polysiloxane comprising a combination of an organo-modified silane with a silica sol, and
- wherein the topcoat layer contains silicon dioxide particles having a D90 determined by scanning transmission electron microscopy of less than 0.50 μm and no further particles having a D90 determined by scanning transmission electron microscopy ≥0.50 μm.
20 more elements
A sensor system comprising:
- a LiDAR unit having an emitter for laser IR light having an operating wavelength of 900 nm to 1600 nm and a receiver for laser light over a wavelength range which is between 800 nm and 1600 nm and is at least partially below the operating wavelength of the LiDAR sensor and
- a cover having a substrate layer comprising a region made of a thermoplastic composition based on aromatic polycarbonate and/or polymethyl methacrylate which is arranged such that the IR light emitted by the LiDAR emitter and received by the LiDAR receiver passes through the region made of the thermoplastic composition,
- wherein the thermoplastic composition has a light transmission Ty (D65, 10°) determined according to DIN EN ISO 13468-2:2006 at a layer thickness of 4 mm of <0.5%,
- wherein
- the thermoplastic composition contains
- a) at least two colorants having an absorption maximum in the range from 400 nm to 650 nm selected from the group consisting of anthraquinone and perinone dyes in a total concentration of 0.07% by weight to 0.5% by weight, and
- b) at least one colorant having an absorption maximum in the range from >650 nm to 800 nm selected from the group consisting of the colorants of formulae (1) to (5) with
- in a concentration of 0.008% to 0.02% by weight,
- wherein
- R1 and R2 independently of one another represent a linear or branched alkyl radical or halogen,
- n is a natural number between 0 and 4,
- in a concentration of 0.002% to 0.008% by weight,
- where
- and
- n is from 1 to 3,
- in a concentration of 0.002% to 0.008% by weight, wherein the total concentration of colorants of formulae (2) and (3) is up to 0.008% by weight,
- in a concentration of 0.04% to 0.3% by weight where R=n-butyl, iso-butyl,
- in a concentration of 0.04% to 0.3% by weight,
- in a total concentration of 0.005% to 0.3% by weight
- wherein the composition contains <0.05% by weight of phthalocyanines, and,
- wherein the cover attenuates the LiDAR signal only to the extent that the signal intensity of IR light emitted by the LiDAR unit and received thereby determined by reflection from a smooth surface painted with TiO2-containing white paint at a distance of 3.2 m is ≥65% of a reference intensity determined without the cover.
18 more elements
Dependencies are inferred from the claim text.