公开(公告)号：US20210064177A1

公开(公告)日：2021-03-04

申请号：US16997899

申请日：2020-08-19

Applicant: Apple Inc.

Inventor： Ehsan KHAJEH ,  George Ho Yin MAK ,  Marcus YIP ,  Brian Michael KING ,  Aaron Scott TUCKER ,  Jason S. GRIESBACH ,  Paul X. WANG ,  Alex Joseph LEHMANN

IPC: G06F3/041 ,  G06F3/043

Abstract: Ultrasonic force detection systems and methods can be based on propagation of ultrasonic waves in a user's body (e.g., in a user's digit). An amount of force can be determined using time-of-flight (TOF) techniques of one or more ultrasonic waves propagating in the user's body. In some examples, an electronic device including a transducer can be coupled to a digit, and can transmit ultrasonic waves into the digit. As the wave propagates through the thickness of the digit, a reflection of at least a portion of the transmitted wave can occur due to the bone and/or due to reaching the opposite side of the digit (e.g., finger pad). One or more reflections can be measured to determine the amount of force.