Patent ID: 8468892
Filing Date: 2013-06-25
Classification: G10K

Abstract:
1. An ultrasonic sensor for at least one of detecting and scanning an object, comprising: a substrate; and a piezoelectric sensor unit at least one of (a) arranged on or at the substrate and (b) connected to the substrate, wherein a rear side of the substrate facing away from the sensor unit has a surface structure including a plurality of elevated portions and recesses, wherein the surface structure is configured so that both (a) a diffuse scattering of ultrasonic waves incident on the rear side from a direction of the sensor unit is effected by it and (b) the elevated portions and/or recesses have a mean lateral extent at least one of (1) in a range between 0.05 μm and 1 mm and (2) which is smaller than or equal to a wavelength of an ultrasonic wave which can be produced by the sensor unit.