公开(公告)号：US20230152433A1

公开(公告)日：2023-05-18

申请号：US17987151

申请日：2022-11-15

Applicant: InvenSense, Inc.

Inventor： Tony LEI ,  Joe Youssef ,  Daniela Hall ,  Ben Eovino ,  Stefon Shelton

IPC: G01S7/521 ,  G05D1/02 ,  G01S15/931 ,  G01S15/08

CPC classification number: G01S7/521 ,  G05D1/0255 ,  G01S15/931 ,  G01S15/08 ,  G01S2015/937

Abstract: A robotic cleaning appliance includes a housing to which is coupled a surface treatment item and a sensor assembly with first and second transducers and an acoustic interface. The first sonic transducer transmits sonic signals through an acoustic interface and out of a first acoustic opening toward a surface beneath the robotic cleaning appliance. The sonic signals reflect from the surface as corresponding returned signals received by the second sonic transducer via a second acoustic opening port of the acoustic interface. A first plurality of annular rings is defined in the external surface around the first acoustic opening port and a second plurality of annular rings is defined in the external surface around the second acoustic opening port. The pluralities of annular rings attenuate direct path echoes from a subset of the transmitted sonic signals which attempt to travel across the external surface to the second acoustic opening port.