Automotive radar / lidar behind reflective surfaces

Patent metadata

Field	Value
Publication number	US-2020072947-A1
Application number	US-201916554701-A
Country	US
Kind code	A1
Filing date	Aug 29, 2019
Priority date	Aug 31, 2018
Publication date	Mar 5, 2020
Grant date	—

Abstract

A sensor assembly for detecting an object and a method of forming a sensor port in sheet metal are disclosed. The sensor assembly includes at least one electromagnetic source for emitting electromagnetic waves. The sensor assembly also includes at least one electromagnetic receiver for receiving the electromagnetic waves after reflecting from the object and corresponding with a detection of the object in proximity to the sensor assembly. In addition, the sensor assembly includes a filter cover disposed adjacent to and covering the at least one electromagnetic source and the at least one electromagnetic receiver configured to allow the electromagnetic waves to pass therethrough while reflecting visible light, thereby concealing the at least one electromagnetic source and the at least one electromagnetic receiver.

First claim

What is claimed is:

1 . A sensor assembly for detecting an object comprising:
at least one electromagnetic source configured to emit electromagnetic waves; at least one electromagnetic receiver configured to receive the electromagnetic waves after reflecting from the object and corresponding with a detection of the object in proximity to said sensor assembly; and a filter cover disposed adjacent to and covering said at least one electromagnetic source and said at least one electromagnetic receiver, the filter cover being transmissive to the electromagnetic waves and reflective to a visible light, thereby concealing said at least one electromagnetic source and said at least one electromagnetic receiver.

2 . The sensor assembly as set forth in claim 1 , wherein the filter cover comprises a dielectric mirror configured to reflect the visible light and transmit the electromagnetic waves.

3 . The sensor assembly as set forth in claim 1 , further including a sensor printed circuit board with said at least one electromagnetic source and said at least one electromagnetic receiver disposed on said sensor printed circuit board and electrically connected thereto.

4 . The sensor assembly as set forth in claim 3 , wherein said filter cover is associated with an exterior surface of a vehicle component selected from the group consisting of one of a logo, an emblem, a badge, a door trim, a door handle, an internal or external rearview mirror, a trim piece, a grill, a fascia, or an applique.

5 . The sensor assembly as set forth in claim 3 , further including a sensor microprocessor disposed on and electrically coupled to said sensor printed circuit board and electrically coupled to said at least one electromagnetic source and said at least one electromagnetic receiver and configured to control emission of the electromagnetic waves using said at least one electromagnetic source and to detect the object in proximity to said sensor assembly using said at least one electromagnetic receiver.

6 . The sensor assembly as set forth in claim 1 , wherein said at least one electromagnetic source is configured to polarize the electromagnetic waves in a first direction; and
wherein the filter cover comprises a reflective polarizer configured to transmit the electromagnetic waves being polarized in the first direction and to reject the electromagnetic waves being polarized in a second direction different than the first direction.

7 . The sensor assembly as set forth in claim 6 , further including a support layer being transmissive to the electromagnetic waves and extending along and engaging said reflective polarizer, with said reflective polarizer disposed between said support layer and said at least one electromagnetic source.

8 . The sensor assembly as set forth in claim 6 , further including a support layer being transmissive to the electromagnetic waves and extending along and engaging said reflective polarizer, with said support layer disposed between said reflective polarizer and said at least one electromagnetic source.

9 . The sensor assembly as set forth in claim 1 , wherein the filter cover comprises a reflective polarizer configured to transmit the electromagnetic waves being polarized in the first direction and to reject the electromagnetic waves being polarized in a second direction different than the first direction and is further configured to reflect light impinging upon an external surface of the reflective polarizer into light having a reflectance spectra matching a reflectance spectra of a metal.

10 . The sensor assembly as set forth in claim 6 , further including a blocking layer configured to block the visible light from passing therethrough, the blocking layer extending along and engaging said reflective polarizer and disposed between said reflective polarizer and said at least one electromagnetic source.

11 . The sensor assembly as set forth in claim 6 , further including a tinting layer configured to tint the visible light from passing therethrough, the tinting layer extending along and engaging said reflective polarizer and disposed between said reflective polarizer and said at least one electromagnetic source.

12 . The sensor assembly as set forth in claim 11 , further including a backlight adjacent said at least one electromagnetic source and configured to generate light outwardly through said reflective polarizer.

13 . The sensor assembly as set forth in claim 12 , wherein said backlight comprises a polarized backlight.

14 . The sensor assembly as set forth in claim 13 , further including a backlight polarizer layer extending along and engaging a tinting layer, with said backlight polarizer layer is disposed between said tinting layer and said at least one electromagnetic source, wherein said backlight is configured to generate light outwardly through backlight said polarizer layer and said tinting layer and said reflective polarizer.

15 . The sensor assembly as set forth in claim 6 , wherein said reflective polarizer comprises a substrate defining a plurality of peaks and a plurality of parallel metal lines deposited on said plurality of peaks.

16 . The sensor assembly as set forth in claim 1 , wherein said at least one electromagnetic source includes a plurality of radar transmitting antennas and said at least one electromagnetic receiver includes a plurality of radar receiving antennas, and wherein the electromagnetic waves are radio waves.

17 . The sensor assembly as set forth in claim 1 , wherein said at least one electromagnetic source includes an infrared laser light source configured to produce pulsed laser light, and said at least one electromagnetic receiver includes an infrared laser light receiver; and
wherein the electromagnetic waves are the pulsed laser light.

18 . The sensor assembly as set forth in claim 1 , wherein said filter cover comprises a sensor port in a panel of sheet metal, the sensor port including a plurality of gaps being parallel and spaced apart from one another and being transmissive to the electromagnetic waves.

19 . The sensor assembly as set forth in claim 18 , wherein the sensor port including a filler within each of the plurality of gaps and being transmissive to the electromagnetic waves, and wherein said sensor port is covered by a paint being transmissive to the electromagnetic waves and having an appearance matching the panel of sheet metal adjacent to the sensor port.

20 . The sensor assembly as set forth in claim 18 , wherein said sensor port is disposed on one of an externally exposed surface of a vehicle, and, and an inner edge or a shut face panel or an internally exposed surface of a closure of a vehicle.

Assignees

• Magna Closures Inc

Inventors

• Miu Traian
• Sabatini Gabriele Wayne

Classifications

• H01Q1/3233

  particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems · CPC title

• G01S13/931 Primary

  of land vehicles · CPC title

• G01S2013/9327

  Sensor installation details · CPC title

• H01Q1/42

  Housings not intimately mechanically associated with radiating elements, e.g. radome · CPC title

• B60R1/12

  Mirror assemblies combined with other articles, e.g. clocks · CPC title