公开(公告)号：US10345973B2

公开(公告)日：2019-07-09

申请号：US15209692

申请日：2016-07-13

Applicant: Apple Inc.

Inventor： Mengshu Huang ,  Patrick J. Au ,  Xingxing Cai ,  Yuta Kuboyama

IPC: G06F3/01 ,  G06F3/044

Abstract: A capacitive sensing system for determining mass displacement and direction is disclosed. In an embodiment, a capacitive sensing system for sensing mass displacement and direction comprises: a mass; a periodic drive electrode pattern formed on or attached to the mass; a sensing electrode array positioned relative to the periodic electrode pattern, the sensing electrode array operable to sense a capacitance in an overlapping area between the periodic drive electrode pattern and the sensing electrode array; and a capacitive sensing circuit coupled to at least the sensing electrode array, the capacitive sensing circuit operable to generate a periodic signal based on the sensed capacitance, to determine a phase shift in the periodic signal in response to the periodic drive electrode pattern moving relative to the sensing electrode array, and to determine, based on the phase shift, a displacement and direction of the mass on a movement axis.

公开(公告)号：US20180018038A1

公开(公告)日：2018-01-18

申请号：US15209692

申请日：2016-07-13

Applicant: Apple Inc.

Inventor： Mengshu Huang ,  Patrick J. Au ,  Xingxing Cai ,  Yuta Kuboyama

IPC: G06F3/044 ,  G06F3/01

CPC classification number: G06F3/044 ,  G06F3/016 ,  H03K17/975 ,  H03K2217/960775

Abstract: A capacitive sensing system for determining mass displacement and direction is disclosed. In an embodiment, a capacitive sensing system for sensing mass displacement and direction comprises: a mass; a periodic drive electrode pattern formed on or attached to the mass; a sensing electrode array positioned relative to the periodic electrode pattern, the sensing electrode array operable to sense a capacitance in an overlapping area between the periodic drive electrode pattern and the sensing electrode array; and a capacitive sensing circuit coupled to at least the sensing electrode array, the capacitive sensing circuit operable to generate a periodic signal based on the sensed capacitance, to determine a phase shift in the periodic signal in response to the periodic drive electrode pattern moving relative to the sensing electrode array, and to determine, based on the phase shift, a displacement and direction of the mass on a movement axis.