Patent · US Active

Ultrasonic sensor for detecting and/or scanning objects

US8468892B2 · kind B2 · utility

0Cited by

5References

23Claims

0Family size

Assignee

Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

Thomas Herzog · Munich, DE
Henning Heuer · Dresden, DE

Key dates

Filing date	Jan 10, 2011
Grant date	Jun 25, 2013
Priority date	—
Expiry date	Jan 9, 2032

Classification

Technology area (CPC G)Physics
CPC primaryG10K11/002
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

An ultrasonic sensor for detecting and/or scanning an object includes a substrate and a piezoelectric sensor unit arranged on or at this substrate and/or connected to this substrate. The rear side of the substrate facing away from the piezoelectric sensor unit has a surface structure including a plurality of elevated portions and recesses, with this surface structure being configured so that a diffuse scattering of ultrasonic waves incident on the rear side from the direction of the sensor unit takes place by it; and/or in that its elevated portions and/or recesses have a mean lateral extent in the range of 0.05 μm to 1 mm, preferably from 0.1 μm to 200 μm, preferably from 0.2 μm to 20 μm, and/or a mean lateral extent which is smaller than or equal to the wavelength of an ultrasonic wave which can be produced by the piezoelectric sensor unit.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.