公开(公告)号：US20190095045A1

公开(公告)日：2019-03-28

申请号：US16123757

申请日：2018-09-06

Applicant: Apple Inc.

Inventor： Ehsan KHAJEH ,  Aaron Scott TUCKER ,  Brian Michael KING ,  Marcus YIP

IPC: G06F3/043

Abstract: Acoustic transducers can be formed form piezoelectric materials including one or more curved (non-linear) segments. The piezoelectric material can be shear poled such that a poling direction of the piezoelectric material can follow the curvature of the piezoelectric material. The piezoelectric material can also have a unidirectional poling direction. In some examples, the piezoelectric material can be a closed ring with a circular or partially circular shape. A shear poling process for a piezoelectric material with curves can include shear poling segments of the piezoelectric material with one or more sets of poling electrodes. The poling electrodes of a respective one of the one or more sets of poling electrodes can be coupled to the same side of the piezoelectric material.

公开(公告)号：US20180341347A1

公开(公告)日：2018-11-29

申请号：US15988991

申请日：2018-05-24

Applicant: Apple Inc.

Inventor： Marduke YOUSEFPOR ,  Mohammad YEKE YAZDANDOOST ,  Aaron Scott TUCKER ,  Marcus YIP ,  Ehsan KHAJEH ,  Brian Michael KING ,  Giovanni GOZZINI

IPC: G06F3/043 ,  G06F3/041

Abstract: Acoustic touch and/or force sensing system architectures and methods for acoustic touch and/or force sensing can be used to detect a position of an object touching a surface and an amount of force applied to the surface by the object. The position and/or an applied force can be determined using time-of-flight (TOF) techniques, for example. Acoustic touch sensing can utilize transducers (e.g., piezoelectric) to simultaneously transmit ultrasonic waves along a surface and through a thickness of a deformable material. The location of the object and the applied force can be determined based on the amount of time elapsing between the transmission of the waves and receipt of the reflected waves. In some examples, an acoustic touch sensing system can be insensitive to water contact on the device surface, and thus acoustic touch sensing can be used for touch sensing in devices that may become wet or fully submerged in water.