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1. (WO2017152143) METHOD FOR DETERMINING FORCE APPLIED TO AN ULTRASONIC SENSOR

Pub. No.:    WO/2017/152143    International Application No.:    PCT/US2017/020818
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Sat Mar 04 00:59:59 CET 2017
IPC: G06F 3/041
G01L 1/16
G06F 3/043
G06K 9/00
Applicants: INVENSENSE, INC.
Inventors: MEDINA, Eitan
ABDI, Behrooz
MASSIH, Sam
FAYOLLE, Romain
TANG, Hao-Yen
Title: METHOD FOR DETERMINING FORCE APPLIED TO AN ULTRASONIC SENSOR
Abstract:
In a method for determining force applied to an ultrasonic sensor, ultrasonic signals are emitted (910) from an ultrasonic sensor (178). A plurality of reflected ultrasonic signals from a finger interacting with the ultrasonic sensor is captured (920). A first data based at least in part on a first reflected ultrasonic signal of the plurality of reflected ultrasonic signals is compared with a second data based at least in part on a second reflected ultrasonic signal of the plurality of reflected ultrasonic signals (930). A deformation of the finger during interaction with the ultrasonic sensor is determined based on differences between the first data based at least in part on the first reflected ultrasonic signal and the second data based at least in part on the second reflected ultrasonic signal (940). A force applied by the finger to the ultrasonic sensor is determined based at least in part on the deformation (950).