Radar sensors for motor vehicles
First Claim
Patent Images
1. A radar sensor for a motor vehicle comprising:
- a radar antenna element; and
an optical system for subdividing a radar beam generated by the antenna element into a plurality of radar beam components that are radiated in different directions, the optical system having a diffraction grating, wherein the diffraction grating is a transmission grating, and wherein the optical system includes a plano-convex lens, the diffraction grating being integrated on the planar surface of the plano-convex lens, and wherein the radar beam components that are radiated in different directions exit the plano-convex lens from the convex surface of the plano-convex lens, and wherein the diffraction grating is made up of an elastic diaphragm having a sequence of grating strips, and a grating constant of the diffraction grating may be varied by applying a variable force to the elastic diaphragm.
1 Assignment
0 Petitions
Accused Products
Abstract
A radar sensor for motor vehicles, having an optical system which subdivides a radar beam generated by a single antenna element into a plurality of beam components that are radiated in different directions, wherein the optical system has a diffraction grating.
26 Citations
11 Claims
-
1. A radar sensor for a motor vehicle comprising:
-
a radar antenna element; and an optical system for subdividing a radar beam generated by the antenna element into a plurality of radar beam components that are radiated in different directions, the optical system having a diffraction grating, wherein the diffraction grating is a transmission grating, and wherein the optical system includes a plano-convex lens, the diffraction grating being integrated on the planar surface of the plano-convex lens, and wherein the radar beam components that are radiated in different directions exit the plano-convex lens from the convex surface of the plano-convex lens, and wherein the diffraction grating is made up of an elastic diaphragm having a sequence of grating strips, and a grating constant of the diffraction grating may be varied by applying a variable force to the elastic diaphragm. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A radar sensor for a motor vehicle comprising:
-
a radar antenna element; and an optical system for subdividing a radar beam generated by the antenna element into a plurality of radar beam components that are radiated in different directions, the optical system having a plano-convex lens and a diffraction grating integrated into the lens, wherein; the diffraction grating is a transmission grating; the diffraction grating is a blaze grating, which generates only a single secondary beam besides generating a main beam, the diffraction grating being integrated on the planar surface of the plano-convex lens, and the radar beam components that are radiated in different directions exit the plano-convex lens from the convex surface of the plano-convex lens; the diffraction grating is horizontally oriented, so that the secondary beam is directed slantwise onto a roadway, the secondary beam configured for at least one of measuring the absolute speed of the motor vehicle, for calibration control, and for detection of loss of sight; and the diffraction grating is made up of an elastic diaphragm having a sequence of grating strips, and a grating constant of the diffraction grating may be varied by applying a variable force to the elastic diaphragm. - View Dependent Claims (7, 8)
-
-
9. A radar sensor for a motor vehicle, comprising:
-
an antenna element; and an optical system for subdividing a radar beam generated by the antenna element into a plurality of beam components that are radiated in different directions, the optical system having a diffraction grating, wherein the diffraction grating is a transmission grating, and wherein the optical system includes a plano-convex lens; wherein a grating constant of the diffraction grating may be varied, and wherein the diffraction grating is made up of an elastic diaphragm having a sequence of grating strips, and the grating constant of the diffraction grating may be varied by applying a variable force to the elastic diaphragm. - View Dependent Claims (10, 11)
-
Specification